dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Industrial Assembly & Maintenance

Dow Corning

brand Silicone Sealants and Foams

for Industrial Assembly and Maintenance

Selection Guide

PROTECT

ADHERE

SEAL

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Stability over a wide temperature range

When properly cured, most of our products
can be used at temperatures ranging from
-70 to 350°F/-56 to 177°C (400°F/204°C
intermittent), with still others capable of
higher thermal stability up to and exceeding
500°F/260°C (600°F/315°C intermittent).

Weather resistance

High resistance to ultraviolet (UV) rays,
radiation and weather prevents our products
from hardening, cracking, crumbling, drying
and becoming brittle.

Chemical stability

Our sealants do not readily degrade, even
under long-term exposure to many chemicals
and atmospheric pollutants.

Good bond strength

Our products provide good adhesion to a
wide variety of industrial materials, including
glass, ceramics and wood masonry; painted
surfaces; and many metals and plastics.

Electrical properties

Designed for a variety of applications, our
products can be used in various electrical
and electronic applications, including devices
that are thermally cycled over a wide tem-
perature range.

Low flammability

In fire conditions, silicone adhesives/sealants

are reluctant to burn. Many products comply

with UL flammability standards.

Dow Corning

Silicone Sealants

Silicon-based

Dow Corning

sealants last longer and are more versatile than most organic

polymer sealants. They are durable RTV sealants; cure at room temperature to a tough,
rubbery solid with exceptional performance characteristics; and meet a wide variety of your
industrial bonding and sealing needs.

Benefits of

Dow Corning

silicone sealants include:

When you specify an assembly and maintenance product from Dow Corning, you receive a
solution backed by the world leader in silicone technology with more than 70 years of expertise
and innovations.

INDUSTRIAL ASSEMBLY
AND MAINTENANCE

SOLUTIONS FOR

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Why Silicones?

For application versatility, durability, aesthetics and value, silicones outperform organics.
Silicone sealants from Dow Corning are unrivaled, delivering:

• Protection that typically lasts three times longer than organic materials in the same

applications, thus avoiding premature and costly renovations

• Proven performance with successful track records in a range of diverse applications

• Outstanding life-cycle value

• All-weather application and performance, with resistance to UV exposure, ozone, rain,

snow and extreme temperatures

• More durability than organic-based materials

• Continued flexibility and adhesion, even while being stretched or compressed

• Resistance to cracking, splits or tears

without hardening or fading

• Easy application over a wide

temperature range

Organics are prone to chemical reversion,
a phenomenon in which organic poly-
urethane loses its cured properties and
reverts to a substance with the softness
of chewing gum. The differences between
silicones and organics are the difference
between long-term value and premature
failure. Silicones prevail.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Which Silicone?

Silicone sealants from Dow Corning are offered in a wide range of formulation
options, including:

•

RTV (room-temperature-vulcanizing) sealants

These silicone polymers work with a condensation reaction in humidity at typical
room conditions, but the cure can be accelerated by increasing temperature and
humidity. RTV sealants are easy to install, and they offer relatively low cost and
good adhesion.

•

Heat cure sealants

Delivering much shorter cure times than RTV sealants, these materials can be
automatically dispensed to meet industrial equipment assembly requirements.

•

Hot-melt silicone sealants

Ideal for automated applications in the manufacturing of various components, these
reactive hot-melt materials provide instant green strength, which can increase
productivity, improve quality and reduce costs in industrial assembly applications.

•

One-part materials

Containing all the ingredients needed to produce a cured material, these sealants
use external factors – such as moisture in the air, heat or the presence of UV light
– to initiate, speed or complete the curing process. One-part sealant formulations are
easy to use and typically have a low- or room-temperature cure, but moisture-curing
materials may take 24 hours or more to fully cure.

•

Two-part materials

With the reactive ingredients separated to prevent premature initiation of the cure
process, these materials often use the addition of heat to facilitate or accelerate
cure. Two-part formulations typically offer longer shelf life, high-speed cure, and the
ability to carefully control working/open time and cure time by manipulating the
formulation, but they require mixing and may involve more sophisticated processes
and application expertise.

•

Silicone foams

Ideal as compression gaskets or as “environmental seals” to protect against ambient
air, splashed water, dust and moisture, these materials are a cost-effective sealing
solution compared to preformed gaskets and foam tapes for use sealing high-tolerance
gaps. Applied using automated robotic dispensing, these materials have a fast
room-temperature or low-temperature cure.

Sealant Chemistry

Silicone sealants typically consist of an inorganic siloxane (Si-O-Si-O-Si) polymer and

appropriate filler, crosslinker, catalyst, adhesion promoter, pigment and plasticizer.

To meet specific needs, silicone sealants are offered in a variety of chemistries

and cure types, each with their own benefits. The following tables will assist you

in selecting the right material to help meet your performance requirements.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

TABLE I. SEALANT CHEMISTRIES

Chemistry

Surface Cure

Green Strength

Primerless

Adhesion

Shelf Life

Clear/T

ranslucent

Features

Limitations

Acid Cure

Acetoxy

(One-Part)

●●●

●

●●●

●●

• Competitively priced versus organics

• Fast cure

• No-catalyst versions available

• Good shelf life

• Clear

• Adhesion durability

• Acidic; potentially corrosive to

metals

• Strong odor

Neutral Cure

Alkoxy

(One-Part)

●

●●

• Neutral cure

• Robust adhesion

• Economical; chalk filled

• Low VOC

• Stability of silica system not robust,

so achieving clarity is difficult

• Slower cure speed

• 12-month shelf life

Oxime

(One-Part)

●●

●

●●

• Fast cure

• Low-catalyst options possible

• Good silica versions with clear/translucent

offerings

• High-temperature (104°F/40°C)

storage causes discoloration

• Strong odor

• High VOC, typically due to large

leaving group

Alkoxy

(Two-Part)

●●

●●●

●

• Fast cure/green strength; parts can be

moved in under 4 hours

• Total VOC low when mixed

• Tunable cure profile based on mix ratio

• Adhesion to many substrates

• Dispensing equipment and

maintenance

• Settling of components can be

an issue

• Catalyst is flammable

Hot Melt

(One-Part)

●●

●●●

●●

●●●

• Instant green strength for immediate hold

• Instant assembly – no “hold time” requirement

• Worker friendly – low odor,

nonhazardous

• Long pot life and long open time

• Proven neutral-cure 100% silicone chemistry

• Aggressive adhesion to a variety of substrates

• Not intended for use when in total

confinement (atmospheric moisture

required for cure)

• Not intended for continuous water

immersion

• Not intended for use on surfaces

that might bleed oils, plasticizers

or solvents

Platinum

(Two-Part)

“Silicone

Foams”

●

—

●

• Fast-curing products available in heat cure

and room temperature cure options

• Ideal choice for compression gaskets

• Provides environmental sealing versus

elements

• Low sealing force/modulus

• Ideal for sealing enclosures requiring

serviceability

• Allows for flexibility in seal and bead design

• Not optimized for fluid sealing

• Does not offer high adhesion with-

out a primer or surface treatment

• Cure inhibition (“poisoning” of

platinum catalyst)

NA = Not available LA = Limited availability – = Poor • = Good •• = Better ••• = Best

Dow Corning

3145 RTV MIL-A-46146 Adhesive Sealant is available in clear translucent.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

TABLE II. ACETOXY SEALANTS

Acetoxy Sealants

High-Temperature Acetoxy Sealants

Dow Corning

700

Industrial Grade Silicone Sealant

Dow Corning

730 FS

Solvent Resistant Sealant

Dow Corning

732

Multi-Purpose Sealant

Dow Corning

733

Glass & Metal Sealant

Dow Corning

734

Flowable Sealant

Dow Corning

786

Mildew Resistant Sealant

Dow Corning

1890

Protective Coating

Dow Corning

736

Heat Resistant Sealant

Dow Corning

Q3-1566

Heat Resistant Adhesive/Sealant

Special Features

Resistant to weathering;

withstands temperature

extremes

Solvent-resistant

Multipurpose; FDA; NSF

Good adhesion

Flowable; self-leveling

Mildew-resistant

Excellent moisture protection

and resistance to sand, dust

and dirt particles; easy-to-apply,

thin coating that will not run

or drip when applied to vertical

or overhead surfaces

High-temperature-resistant

Primary Uses

General industrial sealing and

adhesive applications

Bonding, sealing and caulking

where resistance to fuels, oils

and solvents is required

General-purpose bond-

ing and sealing; making

formed-in-place gaskets

Bonding and sealing

To fill voids, cracks and crevices;

conformal coating for connections

and battery terminals

Interior sealing applications

exposed to high moisture

General-purpose coating

for protecting motors and

electrical equipment;

maintenance coating

Sealing and bonding applica-

tions exposed to tempera-

tures as high as 600°F

(315°C)

Sealing and bonding

applications exposed to

temperatures as high as

662°F (350°C)

Applications

Adhering auto trim, appliance

trim and nameplates; formed-

in-place gaskets for compres-

sors, gearboxes and pumps;

bonding appliance parts and

signs; caulking doors and

windows; sealing out moisture

Assembling and repairing

fuel lines and tanks; bonding

components exposed to fuels,

oils and solvents; making

formed-in-place gaskets

for chemical compressors,

fluid-filled distributors and

transformers; repairing rubber

linings exposed to corrosive

conditions; sealing pipe joints

on lines carrying corrosive

chemicals

Sealing flashing, vents,

flues, gutters, marine cabins

and windows, and electrical

boxes; caulking joints in

sheet metal stacks and

ductwork; bonding appliance

parts, signs and sign letters;

adhering auto trim, appliance

trim and nameplates; making

formed-in-place gaskets for

compressors, gearboxes and

pumps

Bonding and sealing appliances,

heavy equipment, marine equip-

ment and recreational vehicles

Coating mechanical devices;

making formed-in-place gaskets

for compressors, gearboxes

and pumps; potting electrical

terminals; sealing ammunition

fuses, trailers and truck cabs

Sealing tubs, sinks,

plumbing fixtures and

interior walls

Coating motor windings, bus

bars, splines, connectors,

transformers, insulators,

trailers, truck cabs and

wooden pole tops

Sealing fired heaters,

flanged pipe joints, access

doors, moving oven belts,

industrial ovens and boilers,

plywood drying ovens, bag

filters on smokestacks, and

flues on gas appliances;

bonding appliance parts and

electrical and electronic

equipment; caulking joints

in sheet metal stacks and

ductwork

Can be used in ovens,

cookers and other heating

equipment; automotive oil

and other coolant sealing

applications

Temperature Range

, °F/°C,

continuous (intermittent)

-70 to 350 (400)/-57 to 177 (204)

-85 to 500 (600)/-65 to 260

(315)

-58 to 527 (662)/-50 to 275

(350)

Skin-Over Time, min

Tack-Free Time, min

Extrusion Rate, g/min

350

250

350

650

350

—

390

270

Durometer, Shore A

Tensile, PSI

225

300

325

335

222

325

—

350

522

Elongation

577

200

600

500

315

600

—

600

340

Specific Gravity

1.02

1.4

1.04

1.03

1.04

1.03

1.04

1.06

Listings/Specs

FDA 21

; NSF 51; UL 94 HB

—

FDA 21

, NSF 51, NSF 61,

UL 94 HB, MIL spec

NSF 51, UL 94 HB, FDA

FDA 21

, NSF 51, UL 94 HB,

MIL spec

FDA 21

, NSF 51

FDA 21

, NSF 51, UL 94 HB,

MIL spec

—

Color

Aluminum, clear translucent,

white, black

White

Aluminum, black,

clear translucent, white

Aluminum, black,

clear translucent, white

Clear translucent, white

Gray

Red

Black

Sealant Type for Fluid

Resistance Table

FVMQ

Primerless Adhesion

Acrylic

No Adhesion

Not Tested

No Adhesion

Not Tested

Acrylonitrile Butadiene

Styrene (ABS)

No Adhesion

Fair

No Adhesion

Not Tested

Fair

Not Tested

Low Density Polyethylene

(LDPE)

No Adhesion

Not Tested

No Adhesion

Not Tested

Nylon 6/6

Poor

No Adhesion

Fair

Poor

Not Tested

Fair

Not Tested

Polycarbonate

No Adhesion

Poor

No Adhesion

Poor

No Adhesion

Not Tested

No Adhesion

Not Tested

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Not Tested

Glass

Poor

Fair

Poor

Fair

Not Tested

Fair

Not Tested

Aluminum, Mill Finish

No Adhesion

Not Tested

Poor

Not Tested

Copper

Poor

No Adhesion

Not Tested

Fair

Not Tested

Steel, Galvanized

No Adhesion

Poor

No Adhesion

Not Tested

No Adhesion

Not Tested

Steel, Low Carbon

No Adhesion

Not Tested

No Adhesion

Not Tested

Steel, Stainless

No Adhesion

Not Tested

No Adhesion

Not Tested

Most paints will not adhere to sealant; not for underwater structural or adhesive applications; requires atmospheric moisture to cure. May stress-crack some plastics;

test

before

use.

Estimated service temperatures based on product formulation and laboratory testing. Actual service temperature range is dependent on other factors, including the

specific application environment.

Meets

FDA

CFR

21.177.2600.

Meets FDA CFR 21.177.2600 and FDA CFR 21.175.105.

Refer to the “Performance Profiles for

Silastic

brand Silicone and Fluorosilicone Rubber and XIAMETER

brand Silicone Rubber” guide, Form No. 45-0113, for

assistance in determining fluid resistance capabilities of selected sealant types.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Acetoxy Sealants

High-Temperature Acetoxy Sealants

Dow Corning

700

Industrial Grade Silicone Sealant

Dow Corning

730 FS

Solvent Resistant Sealant

Dow Corning

732

Multi-Purpose Sealant

Dow Corning

733

Glass & Metal Sealant

Dow Corning

734

Flowable Sealant

Dow Corning

786

Mildew Resistant Sealant

Dow Corning

1890

Protective Coating

Dow Corning

736

Heat Resistant Sealant

Dow Corning

Q3-1566

Heat Resistant Adhesive/Sealant

Special Features

Resistant to weathering;

withstands temperature

extremes

Solvent-resistant

Multipurpose; FDA; NSF

Good adhesion

Flowable; self-leveling

Mildew-resistant

Excellent moisture protection

and resistance to sand, dust

and dirt particles; easy-to-apply,

thin coating that will not run

or drip when applied to vertical

or overhead surfaces

High-temperature-resistant

Primary Uses

General industrial sealing and

adhesive applications

Bonding, sealing and caulking

where resistance to fuels, oils

and solvents is required

General-purpose bond-

ing and sealing; making

formed-in-place gaskets

Bonding and sealing

To fill voids, cracks and crevices;

conformal coating for connections

and battery terminals

Interior sealing applications

exposed to high moisture

General-purpose coating

for protecting motors and

electrical equipment;

maintenance coating

Sealing and bonding applica-

tions exposed to tempera-

tures as high as 600°F

(315°C)

Sealing and bonding

applications exposed to

temperatures as high as

662°F (350°C)

Applications

Adhering auto trim, appliance

trim and nameplates; formed-

in-place gaskets for compres-

sors, gearboxes and pumps;

bonding appliance parts and

signs; caulking doors and

windows; sealing out moisture

Assembling and repairing

fuel lines and tanks; bonding

components exposed to fuels,

oils and solvents; making

formed-in-place gaskets

for chemical compressors,

fluid-filled distributors and

transformers; repairing rubber

linings exposed to corrosive

conditions; sealing pipe joints

on lines carrying corrosive

chemicals

Sealing flashing, vents,

flues, gutters, marine cabins

and windows, and electrical

boxes; caulking joints in

sheet metal stacks and

ductwork; bonding appliance

parts, signs and sign letters;

adhering auto trim, appliance

trim and nameplates; making

formed-in-place gaskets for

compressors, gearboxes and

pumps

Bonding and sealing appliances,

heavy equipment, marine equip-

ment and recreational vehicles

Coating mechanical devices;

making formed-in-place gaskets

for compressors, gearboxes

and pumps; potting electrical

terminals; sealing ammunition

fuses, trailers and truck cabs

Sealing tubs, sinks,

plumbing fixtures and

interior walls

Coating motor windings, bus

bars, splines, connectors,

transformers, insulators,

trailers, truck cabs and

wooden pole tops

Sealing fired heaters,

flanged pipe joints, access

doors, moving oven belts,

industrial ovens and boilers,

plywood drying ovens, bag

filters on smokestacks, and

flues on gas appliances;

bonding appliance parts and

electrical and electronic

equipment; caulking joints

in sheet metal stacks and

ductwork

Can be used in ovens,

cookers and other heating

equipment; automotive oil

and other coolant sealing

applications

Temperature Range

, °F/°C,

continuous (intermittent)

-70 to 350 (400)/-57 to 177 (204)

-85 to 500 (600)/-65 to 260

(315)

-58 to 527 (662)/-50 to 275

(350)

Skin-Over Time, min

Tack-Free Time, min

Extrusion Rate, g/min

350

250

350

650

350

—

390

270

Durometer, Shore A

Tensile, PSI

225

300

325

335

222

325

—

350

522

Elongation

577

200

600

500

315

600

—

600

340

Specific Gravity

1.02

1.4

1.04

1.03

1.04

1.03

1.04

1.06

Listings/Specs

FDA 21

; NSF 51; UL 94 HB

—

FDA 21

, NSF 51, NSF 61,

UL 94 HB, MIL spec

NSF 51, UL 94 HB, FDA

FDA 21

, NSF 51, UL 94 HB,

MIL spec

FDA 21

, NSF 51

FDA 21

, NSF 51, UL 94 HB,

MIL spec

—

Color

Aluminum, clear translucent,

white, black

White

Aluminum, black,

clear translucent, white

Aluminum, black,

clear translucent, white

Clear translucent, white

Gray

Red

Black

Sealant Type for Fluid

Resistance Table

FVMQ

Primerless Adhesion

Acrylic

No Adhesion

Not Tested

No Adhesion

Not Tested

Acrylonitrile Butadiene

Styrene (ABS)

No Adhesion

Fair

No Adhesion

Not Tested

Fair

Not Tested

Low Density Polyethylene

(LDPE)

No Adhesion

Not Tested

No Adhesion

Not Tested

Nylon 6/6

Poor

No Adhesion

Fair

Poor

Not Tested

Fair

Not Tested

Polycarbonate

No Adhesion

Poor

No Adhesion

Poor

No Adhesion

Not Tested

No Adhesion

Not Tested

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Not Tested

Glass

Poor

Fair

Poor

Fair

Not Tested

Fair

Not Tested

Aluminum, Mill Finish

No Adhesion

Not Tested

Poor

Not Tested

Copper

Poor

No Adhesion

Not Tested

Fair

Not Tested

Steel, Galvanized

No Adhesion

Poor

No Adhesion

Not Tested

No Adhesion

Not Tested

Steel, Low Carbon

No Adhesion

Not Tested

No Adhesion

Not Tested

Steel, Stainless

No Adhesion

Not Tested

No Adhesion

Not Tested

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

TABLE III. ALKOXY (NEUTRAL-CURE) SEALANTS

Dow Corning

739

Plastic Adhesive

Dow Corning

748

Noncorrosive Sealant

Dow Corning

832

Multi-Surface Adhesive/Sealant

Dow Corning

838

Silicone Adhesive/Sealant

Dow Corning

3145

RTV MIL-A-46146

Adhesive Sealant

Dow Corning

7091

Adhesive Sealant

Dow Corning

7092

High Green Strength Adhesive

and Sealant

Special Features

Plastic adhesive

FDA- and NSF-approved

Excellent adhesion

Nonflowing; high elongation for added

stress-relief; UL 94 HB; faster in-line

processing with optional heat acceler-

ation; added reliability can result from

lower cured stress

Nonflowing; high tensile/tear strength

and elongation; faster in-line process-

ing with optional heat acceleration;

can be considered for uses with Mil

Spec requirements

Non-sag; paste consistency; easy

to apply; cures to a tough, flexible

rubber; excellent adhesion to many

substrates

Instant green strength; easy to use;

excellent adhesion to a wide range of

substrates, such as glass, metals and

plastics; non-sag; paste consistency;

fast strength buildup supports

productivity enhancements due to

fast handling of bonded units; saves

time, as no buffer for strength buildup

required

Primary Uses

Adhering, bonding and sealing plastic

and metal; making formed-in-place

gaskets

Electrical sealing applications;

food-processing and transportation

applications

Bonding, sealing and assembly where a

noncorrosive sealant is required

General-purpose adhesive applica-

tions using automated or manual

needle dispensing systems

Sealing and assembly in applications

requiring Mil Spec standards

Applications that demand a strong but

flexible bond, such as when bonding

materials with differing thermal

expansion rates (e.g., glass to metal

or glass to plastic)

Applications that require immediate

handling and processing of the units

Applications

Adhering auto trim, appliance trim and

parts; assembling plastic toys; bonding

gaskets in refrigeration units, signs and

sign letters; caulking cement and

masonry; making formed-in-place

gaskets for compressors, gearboxes and

pumps; sealing flashing, vents, gutters,

marine cabins and windows; waterproofing

leakproof tractor cabs

Bonding and sealing electrical equip-

ment, power and control connections,

motors, cover plates, instrument lenses,

regulators, junction boxes, and control

panels; sealing refrigerator and freezer

liners

Sealing and repairing roof penetrations,

gutters, concrete floor seams, marine

equipment and windows, pipes, and

threaded connections; assembling

original equipment components

Sealing openings in modules and

housings; adding mechanical stability

to individual components; assembly of

components on printed wiring boards

(PWBs); sealing in and around wired

and electrical leads; yoke assembly

Sealing openings in modules and

housings; assembly of components

on printed wiring boards (PWBs);

sealing in and around wired and

electrical leads

Adhering commonly used materials,

including enameled and painted steel,

aluminum, ceramic and glass, as well

as to certain plastics used in engi-

neering applications; formed-in-place

gasket (FIPG) applications

Adhering commonly used materials,

including certain steels, aluminum and

glass, as well as certain plastics used

in engineering applications

Temperature Range

, °F/°C,

continuous (intermittent)

-65 to 300 (350)/-54 to 149 (177)

-65 to 350 (400)/-55 to 177 (204)

-67 to 300 (350)/-55 to 149 (177)

-49 to 392/-45 to 200

-40 to 356/-40 to 180

-58 to 302/-50 to 150

Skin-Over Time, min

—

15-25

Tack-Free Time, min

63.8

Extrusion Rate, g/min

110

150

133

199.2

78.6

185

217

Durometer, Shore A

45.6

Tensile, PSI

225

275

350

270

138

363

290

Elongation

640

350

420

—

626

680

435

Specific Gravity

1.52

1.33

1.02

1.10

1.4

1.55

Listings/Specs

UL 94 HB

FDA 21

, NSF 51, NSF 61, UL 94 HB

UL 94 HB

MIL-A-46146 Group II, TY I, UL 94 HB —

UL 94 HB

Color

Black, gray, white

Off-white

Black, gray, off-white

White

Clear translucent

Black, white, gray

Black, white

Sealant Type for Fluid

Resistance Table

Primerless Adhesion

Acrylic

Good

No Adhesion

Fair

Not Tested

No Adhesion

Excellent

Not Tested

Acrylonitrile Butadiene

Styrene (ABS)

Excellent

No Adhesion

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Low Density Polyethylene

(LDPE)

No Adhesion

Not Tested

No Adhesion

Not Tested

Nylon 6/6

Excellent

Good

Excellent

Not Tested

Fair

Excellent

Not Tested

Polycarbonate

No Adhesion

Excellent

Not Tested

No Adhesion

Not Tested

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Not Tested

Glass

Excellent

Not Tested

Good

Excellent

Not Tested

Aluminum, Mill Finish

Excellent

Not Tested

Poor

Excellent

Not Tested

Copper

Good

No Adhesion

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Steel, Galvanized

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Steel, Low Carbon

Fair

Excellent

Not Tested

Poor

Excellent

Not Tested

Steel, Stainless

Poor

Fair

Excellent

Not Tested

No Adhesion

Good

Not Tested

Most paints will not adhere to sealant; not for underwater structural or adhesive applications; requires atmospheric moisture to cure. May stress-crack some plastics;

test

before

use.

Estimated service temperatures based on product formulation and laboratory testing. Actual service temperature range is dependent on other factors,

including the specific application environment.

Meets FDA CFR 21.177.2600 and FDA CFR 21.175.105.

Refer to the “Performance Profiles for

Silastic

brand Silicone and Fluorosilicone Rubber and XIAMETER

brand Silicone Rubber” guide,

Form No. 45-0113, for assistance in determining fluid resistance capabilities of selected sealant types.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Dow Corning

739

Plastic Adhesive

Dow Corning

748

Noncorrosive Sealant

Dow Corning

832

Multi-Surface Adhesive/Sealant

Dow Corning

838

Silicone Adhesive/Sealant

Dow Corning

3145

RTV MIL-A-46146

Adhesive Sealant

Dow Corning

7091

Adhesive Sealant

Dow Corning

7092

High Green Strength Adhesive

and Sealant

Special Features

Plastic adhesive

FDA- and NSF-approved

Excellent adhesion

Nonflowing; high elongation for added

stress-relief; UL 94 HB; faster in-line

processing with optional heat acceler-

ation; added reliability can result from

lower cured stress

Nonflowing; high tensile/tear strength

and elongation; faster in-line process-

ing with optional heat acceleration;

can be considered for uses with Mil

Spec requirements

Non-sag; paste consistency; easy

to apply; cures to a tough, flexible

rubber; excellent adhesion to many

substrates

Instant green strength; easy to use;

excellent adhesion to a wide range of

substrates, such as glass, metals and

plastics; non-sag; paste consistency;

fast strength buildup supports

productivity enhancements due to

fast handling of bonded units; saves

time, as no buffer for strength buildup

required

Primary Uses

Adhering, bonding and sealing plastic

and metal; making formed-in-place

gaskets

Electrical sealing applications;

food-processing and transportation

applications

Bonding, sealing and assembly where a

noncorrosive sealant is required

General-purpose adhesive applica-

tions using automated or manual

needle dispensing systems

Sealing and assembly in applications

requiring Mil Spec standards

Applications that demand a strong but

flexible bond, such as when bonding

materials with differing thermal

expansion rates (e.g., glass to metal

or glass to plastic)

Applications that require immediate

handling and processing of the units

Applications

Adhering auto trim, appliance trim and

parts; assembling plastic toys; bonding

gaskets in refrigeration units, signs and

sign letters; caulking cement and

masonry; making formed-in-place

gaskets for compressors, gearboxes and

pumps; sealing flashing, vents, gutters,

marine cabins and windows; waterproofing

leakproof tractor cabs

Bonding and sealing electrical equip-

ment, power and control connections,

motors, cover plates, instrument lenses,

regulators, junction boxes, and control

panels; sealing refrigerator and freezer

liners

Sealing and repairing roof penetrations,

gutters, concrete floor seams, marine

equipment and windows, pipes, and

threaded connections; assembling

original equipment components

Sealing openings in modules and

housings; adding mechanical stability

to individual components; assembly of

components on printed wiring boards

(PWBs); sealing in and around wired

and electrical leads; yoke assembly

Sealing openings in modules and

housings; assembly of components

on printed wiring boards (PWBs);

sealing in and around wired and

electrical leads

Adhering commonly used materials,

including enameled and painted steel,

aluminum, ceramic and glass, as well

as to certain plastics used in engi-

neering applications; formed-in-place

gasket (FIPG) applications

Adhering commonly used materials,

including certain steels, aluminum and

glass, as well as certain plastics used

in engineering applications

Temperature Range

, °F/°C,

continuous (intermittent)

-65 to 300 (350)/-54 to 149 (177)

-65 to 350 (400)/-55 to 177 (204)

-67 to 300 (350)/-55 to 149 (177)

-49 to 392/-45 to 200

-40 to 356/-40 to 180

-58 to 302/-50 to 150

Skin-Over Time, min

—

15-25

Tack-Free Time, min

63.8

Extrusion Rate, g/min

110

150

133

199.2

78.6

185

217

Durometer, Shore A

45.6

Tensile, PSI

225

275

350

270

138

363

290

Elongation

640

350

420

—

626

680

435

Specific Gravity

1.52

1.33

1.02

1.10

1.4

1.55

Listings/Specs

UL 94 HB

FDA 21

, NSF 51, NSF 61, UL 94 HB

UL 94 HB

MIL-A-46146 Group II, TY I, UL 94 HB —

UL 94 HB

Color

Black, gray, white

Off-white

Black, gray, off-white

White

Clear translucent

Black, white, gray

Black, white

Sealant Type for Fluid

Resistance Table

Primerless Adhesion

Acrylic

Good

No Adhesion

Fair

Not Tested

No Adhesion

Excellent

Not Tested

Acrylonitrile Butadiene

Styrene (ABS)

Excellent

No Adhesion

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Low Density Polyethylene

(LDPE)

No Adhesion

Not Tested

No Adhesion

Not Tested

Nylon 6/6

Excellent

Good

Excellent

Not Tested

Fair

Excellent

Not Tested

Polycarbonate

No Adhesion

Excellent

Not Tested

No Adhesion

Not Tested

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Not Tested

Glass

Excellent

Not Tested

Good

Excellent

Not Tested

Aluminum, Mill Finish

Excellent

Not Tested

Poor

Excellent

Not Tested

Copper

Good

No Adhesion

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Steel, Galvanized

Excellent

Not Tested

No Adhesion

Excellent

Not Tested

Steel, Low Carbon

Fair

Excellent

Not Tested

Poor

Excellent

Not Tested

Steel, Stainless

Poor

Fair

Excellent

Not Tested

No Adhesion

Good

Not Tested

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

TABLE IV. TWO-PART ALKOXY AND ONE-PART OXIME (NEUTRAL-CURE) SEALANTS

Neutral, Two-Component

Neutral, Oxime

Dow Corning

Q3-3636

Adhesive

Dow Corning

236

Dispersion

Dow Corning

737

Neutral Cure Sealant

Dow Corning

750

Plastic-Surface Adhesive/Sealant

Dow Corning

1437

Industrial Sealant and Adhesive

Special Features

Fast cure at room temperature; good, durable adhesion; reduced weight loss (fogging) at high

operating temperatures; fast assembly process; adhesion to a wide variety of substrates;

through cure and not an outside-inward cure like typical moisture-cure adhesives; not

humidity-cure-sensitive

Excellent release; weather resistance;

excellent electrical insulator; coating;

675 cps viscosity

Fast cure

Excellent adhesion to a wide range

of substrates, including polymeric

surfaces that are traditionally difficult

to adhere to, such as anodized

aluminum, vinyl, PVC, polypropylene,

polyethylene, powder coat, paint and

fluoropolymer coatings; priming not

required on most surfaces; usable

over wide temperature range

Fast cure; adheres to glass, metals

and many plastics; wide temperature

range

Primary Uses

Durable adhesive sealing of components that must perform in difficult environments

Release coating for surfaces that offer

protection from weathering, corrosion

and dirt

General manufacturing assembly

operations where quick cure and good

adhesion are important

Adhering, bonding and sealing

a wide range of low-energy

metallic and thermoplastic surfaces

Industrial assembly and maintenance

applications

Applications

Bonding of polycarbonate or glass lenses to the reflector housing of headlamps and fog lamps; in

appliance manufacturing, especially for oven and ceramic hob assembly or for bonding glass to

metal, glass to painted metal or glass to plastic

Easing cleanup of latex-manufacturing

equipment and paint-spraying opera-

tions and removal of flash in urethane

and polyester molding; preventing

adhesion and buildup on conveyor

belts, paper and fabric rolls; reducing

buildup on waste-handling equipment

OEM and assembly applications;

substitute for mechanical fasteners on

appliances; adhering plastic moldings

to plastic substrates; waterproofing

components; sealing coaxial connectors;

protecting instrumentation; may be

used on concrete and masonry

Interior air sealing between a sheet-

or liquid-applied weather-resistant

barrier and fenestration element; edge

lap seal for weather-resistant barriers;

sealing penetrations in weather-

resistant barriers such as plumbing

or ductwork; sealing other difficult-to-

adhere surfaces, such as mill finishes

and plastics

Automated application systems for

OEM applications

Temperature Range

, °F/°C, continuous (intermittent)

—

-40 to 300/-40 to 150

-85 to 350/-65 to 177

—

-60 to 300/-51 to 149

Skin-Over Time, min

2.5-10 min working time

Tack-Free Time, min

5-20

120

—

Extrusion Rate, g/min

—

n/a

395

252

300-400

Durometer, Shore A

32-35

Tensile, PSI

>261

325

175

190

130

Elongation

>300

500

300

785

300

Specific Gravity

1.31 (base)/1.00-1.04 (catalyst)

1.64

1.04

1.38

1.04

Listings/Specs

—

UL 94 HB

—

UL 94 HB

Color

Gray, black, special black

White

Black, clear translucent, white

White

Clear translucent

Sealant Type for Fluid Resistance Table

Primerless Adhesion

Acrylic

Excellent

Not Tested

No Adhesion

Excellent

Acrylonitrile Butadiene Styrene (ABS)

Fair

Not Tested

Poor

Excellent

Good

Low Density Polyethylene (LDPE)

No Adhesion

Not Tested

No Adhesion

Poor

No Adhesion

Nylon 6/6

Poor

Not Tested

No Adhesion

Excellent

Good

Polycarbonate

Excellent

Not Tested

Fair

Excellent

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Excellent

No Adhesion

Glass

Fair

Not Tested

Excellent

Aluminum, Mill Finish

Fair

Not Tested

Excellent

Copper

Excellent

Not Tested

Fair

Excellent

Steel, Galvanized

Excellent

Not Tested

Fair

Excellent

Steel, Low Carbon

Excellent

Not Tested

Excellent

Steel, Stainless

Fair

Not Tested

Excellent

Fair

Excellent

Most paints will not adhere to sealant; not for underwater structural or adhesive applications; requires atmospheric moisture to cure. May stress-crack some plastics;

test

before

use.

Estimated service temperatures based on product formulation and laboratory testing. Actual service temperature range is dependent on other factors,

including the specific application environment.

Refer to the “Performance Profiles for

Silastic

brand Silicone and Fluorosilicone Rubber and XIAMETER

brand Silicone Rubber” guide,

Form No. 45-0113, for assistance in determining fluid resistance capabilities of selected sealant types.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Neutral, Two-Component

Neutral, Oxime

Dow Corning

Q3-3636

Adhesive

Dow Corning

236

Dispersion

Dow Corning

737

Neutral Cure Sealant

Dow Corning

750

Plastic-Surface Adhesive/Sealant

Dow Corning

1437

Industrial Sealant and Adhesive

Special Features

Fast cure at room temperature; good, durable adhesion; reduced weight loss (fogging) at high

operating temperatures; fast assembly process; adhesion to a wide variety of substrates;

through cure and not an outside-inward cure like typical moisture-cure adhesives; not

humidity-cure-sensitive

Excellent release; weather resistance;

excellent electrical insulator; coating;

675 cps viscosity

Fast cure

Excellent adhesion to a wide range

of substrates, including polymeric

surfaces that are traditionally difficult

to adhere to, such as anodized

aluminum, vinyl, PVC, polypropylene,

polyethylene, powder coat, paint and

fluoropolymer coatings; priming not

required on most surfaces; usable

over wide temperature range

Fast cure; adheres to glass, metals

and many plastics; wide temperature

range

Primary Uses

Durable adhesive sealing of components that must perform in difficult environments

Release coating for surfaces that offer

protection from weathering, corrosion

and dirt

General manufacturing assembly

operations where quick cure and good

adhesion are important

Adhering, bonding and sealing

a wide range of low-energy

metallic and thermoplastic surfaces

Industrial assembly and maintenance

applications

Applications

Bonding of polycarbonate or glass lenses to the reflector housing of headlamps and fog lamps; in

appliance manufacturing, especially for oven and ceramic hob assembly or for bonding glass to

metal, glass to painted metal or glass to plastic

Easing cleanup of latex-manufacturing

equipment and paint-spraying opera-

tions and removal of flash in urethane

and polyester molding; preventing

adhesion and buildup on conveyor

belts, paper and fabric rolls; reducing

buildup on waste-handling equipment

OEM and assembly applications;

substitute for mechanical fasteners on

appliances; adhering plastic moldings

to plastic substrates; waterproofing

components; sealing coaxial connectors;

protecting instrumentation; may be

used on concrete and masonry

Interior air sealing between a sheet-

or liquid-applied weather-resistant

barrier and fenestration element; edge

lap seal for weather-resistant barriers;

sealing penetrations in weather-

resistant barriers such as plumbing

or ductwork; sealing other difficult-to-

adhere surfaces, such as mill finishes

and plastics

Automated application systems for

OEM applications

Temperature Range

, °F/°C, continuous (intermittent)

—

-40 to 300/-40 to 150

-85 to 350/-65 to 177

—

-60 to 300/-51 to 149

Skin-Over Time, min

2.5-10 min working time

Tack-Free Time, min

5-20

120

—

Extrusion Rate, g/min

—

n/a

395

252

300-400

Durometer, Shore A

32-35

Tensile, PSI

>261

325

175

190

130

Elongation

>300

500

300

785

300

Specific Gravity

1.31 (base)/1.00-1.04 (catalyst)

1.64

1.04

1.38

1.04

Listings/Specs

—

UL 94 HB

—

UL 94 HB

Color

Gray, black, special black

White

Black, clear translucent, white

White

Clear translucent

Sealant Type for Fluid Resistance Table

Primerless Adhesion

Acrylic

Excellent

Not Tested

No Adhesion

Excellent

Acrylonitrile Butadiene Styrene (ABS)

Fair

Not Tested

Poor

Excellent

Good

Low Density Polyethylene (LDPE)

No Adhesion

Not Tested

No Adhesion

Poor

No Adhesion

Nylon 6/6

Poor

Not Tested

No Adhesion

Excellent

Good

Polycarbonate

Excellent

Not Tested

Fair

Excellent

Polypropylene (PP)

No Adhesion

Not Tested

No Adhesion

Excellent

No Adhesion

Glass

Fair

Not Tested

Excellent

Aluminum, Mill Finish

Fair

Not Tested

Excellent

Copper

Excellent

Not Tested

Fair

Excellent

Steel, Galvanized

Excellent

Not Tested

Fair

Excellent

Steel, Low Carbon

Excellent

Not Tested

Excellent

Steel, Stainless

Fair

Not Tested

Excellent

Fair

Excellent

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Hot-melt, neutral-cure sealants are

intended for assembly, bonding, sealing,

gasketing and other OEM applications

that require instant adhesion and high

green strength.

These sealants feature:
• Excellent adhesion to most substrates

without the need for a primer

• Instant adhesion, enabling parts to be

shipped out quickly

• Long open time
• Long pot life
• Low VOC
• Safe handling with nonhazardous

composition and by-products

• Long life once cured

Dow Corning

HM-2500

Assembly Sealant

Dow Corning

HM-2510

Assembly Sealant

Dow Corning

HM-2515

Assembly Sealant

Dow Corning

HM-2520

Assembly Sealant

Dow Corning

HM-2600

Assembly Sealant

Special Features

Offers the fastest build of green strength;

100% silicone sealant; high viscosity at

room temperature resists flow of material,

which reduces material squeeze-out;

excellent clarity

Offers high robustness; multipurpose

100% silicone sealant; high viscosity

at room temperature resists flow of

material, which reduces material

squeeze-out; excellent clarity

Lowest viscosity; 100% silicone

sealant; can be used in assembly

and lamination; dispensed in fine

beads, fibers or spiral patterns; low

durometer

Offers highest mechanical properties;

100% silicone; high viscosity at room

temperature resists flow of material,

which reduces material squeeze-out;

translucent clear

Offers highest degree of mechanical

adhesion and overall performance;

100% silicone; high durometer;

excellent clarity

Specific Gravity

1.08

1.07

1.11

1.08

Viscosity at 120°C, Pa·s

200

110

15-Min Green Strength, MPa

0.06

0.04

0.004

0.03

Durometer, Shore A

Ultimate Tensile Strength, MPa

4.8

4.6

2.3

4.4

Ultimate Elongation, %

1,900

1,500

1,300

Tear Strength – Type B, pli

Peel Strength

, pli

>45

>41

>33

>30

SAFT

, °C

250

248

280

310

NSF/ANSI Standard 51 and 61

Yes

N/A

FDA 21 CFR 177.2600

Yes

N/A

UL 94 (Relative Thermal Index)

HB (105)

N/A

HB (105)

Color

Clear

Primerless Adhesion

Acrylic

Excellent

Not Tested

Fair

Excellent

Acrylonitrile Butadiene Styrene (ABS)

Excellent

Not Tested

Fair

Excellent

Low Density Polyethylene (LDPE)

Excellent

Not Tested

Fair

Excellent

Nylon 6/6

Excellent

Good

Not Tested

Good

Excellent

Polycarbonate

Excellent

Good

Not Tested

Fair

Excellent

Polypropylene (PP)

Excellent

Not Tested

Good

Excellent

Glass

Excellent

Not Tested

Excellent

Aluminum, Mill Finish

Excellent

Not Tested

Excellent

Good

Copper

Excellent

Not Tested

Good

Steel, Galvanized

Excellent

Not Tested

Excellent

Steel, Low Carbon

Excellent

Not Tested

Good

Excellent

Steel, Stainless

Excellent

Not Tested

Excellent

Duranar

, Black

Excellent

Not Tested

Excellent

Fluropon

, White

Excellent

Not Tested

Excellent

Good

Polyethylene Powder Coatings (PEPC), Black Excellent

Excellent

Not Tested

Excellent

Most paints will not adhere to sealant; not for underwater structural or adhesive applications;

requires atmospheric moisture to cure. May stress-crack some plastics; test before use.

180° peel from various substrates based on ASTM C794: 21-day cure

(24 ±2°C; 50 ±5% RH) + 7-day H

immersion.

Shear adhesion failure temperature based on ASTM 4498.

Not available; has not been submitted for testing and certification.

Qualified only under electronics or lighting industry label.

TABLE V. HOT-MELT (NEUTRAL-CURE) SEALANTS

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Dow Corning

HM-2500

Assembly Sealant

Dow Corning

HM-2510

Assembly Sealant

Dow Corning

HM-2515

Assembly Sealant

Dow Corning

HM-2520

Assembly Sealant

Dow Corning

HM-2600

Assembly Sealant

Special Features

Offers the fastest build of green strength;

100% silicone sealant; high viscosity at

room temperature resists flow of material,

which reduces material squeeze-out;

excellent clarity

Offers high robustness; multipurpose

100% silicone sealant; high viscosity

at room temperature resists flow of

material, which reduces material

squeeze-out; excellent clarity

Lowest viscosity; 100% silicone

sealant; can be used in assembly

and lamination; dispensed in fine

beads, fibers or spiral patterns; low

durometer

Offers highest mechanical properties;

100% silicone; high viscosity at room

temperature resists flow of material,

which reduces material squeeze-out;

translucent clear

Offers highest degree of mechanical

adhesion and overall performance;

100% silicone; high durometer;

excellent clarity

Specific Gravity

1.08

1.07

1.11

1.08

Viscosity at 120°C, Pa·s

200

110

15-Min Green Strength, MPa

0.06

0.04

0.004

0.03

Durometer, Shore A

Ultimate Tensile Strength, MPa

4.8

4.6

2.3

4.4

Ultimate Elongation, %

1,900

1,500

1,300

Tear Strength – Type B, pli

Peel Strength

, pli

>45

>41

>33

>30

SAFT

, °C

250

248

280

310

NSF/ANSI Standard 51 and 61

Yes

N/A

FDA 21 CFR 177.2600

Yes

N/A

UL 94 (Relative Thermal Index)

HB (105)

N/A

HB (105)

Color

Clear

Primerless Adhesion

Acrylic

Excellent

Not Tested

Fair

Excellent

Acrylonitrile Butadiene Styrene (ABS)

Excellent

Not Tested

Fair

Excellent

Low Density Polyethylene (LDPE)

Excellent

Not Tested

Fair

Excellent

Nylon 6/6

Excellent

Good

Not Tested

Good

Excellent

Polycarbonate

Excellent

Good

Not Tested

Fair

Excellent

Polypropylene (PP)

Excellent

Not Tested

Good

Excellent

Glass

Excellent

Not Tested

Excellent

Aluminum, Mill Finish

Excellent

Not Tested

Excellent

Good

Copper

Excellent

Not Tested

Good

Steel, Galvanized

Excellent

Not Tested

Excellent

Steel, Low Carbon

Excellent

Not Tested

Good

Excellent

Steel, Stainless

Excellent

Not Tested

Excellent

Duranar

, Black

Excellent

Not Tested

Excellent

Fluropon

, White

Excellent

Not Tested

Excellent

Good

Polyethylene Powder Coatings (PEPC), Black Excellent

Excellent

Not Tested

Excellent

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

TABLE VI. SILICONE FOAMS (TWO-PART, ADDITION-CURE)

Dow Corning

8257

Silicone Foam

Dow Corning

3-8209

Silicone Foam

Dow Corning

3-8219 RF

Silicone Foam

Dow Corning

3-8259 RF

Silicone Foam

White

Black

Gray

Dark Gray

Special

Features

Low hardness (Shore

00); available in

white and black; low

density

Low to medium

hardness

(Shore 00);

medium

density

Medium hard-

ness (Shore

00); medium to

high density;

reduced flow

aids applica-

tion to vertical

surfaces

Medium hardness

(Shore 00); available

in gray and dark gray;

high density; reduced

flow aids application to

vertical surfaces

Viscosity, mPas A: 21,000

B: 12,000

A: 20,000

B: 12,000

A: 14,000

B: 15,000

A: 21,000

B: 40,000

68,000

63,000

A: 64,000

B: 62,000

Snap Time, sec 230

240

220

200

Tack-Free

Time, min

Density, kg/m

140

150

250

300

330

Flowability, cm Flowable Flowable Flowable

Cell Structure,

Zellen/3 cm

Fine

Hardness,

Shore 00

Two-part, addition-cure silicone foams

designed to be dispensed and cured

directly on parts to form an integrated

compression gasket. They typically

are used in automotive parts, including

seals for vibration and noise damping,

housings for electronic devices, exterior

lighting, and domestic appliance

components.

These sealants feature:
• Room temperature cure (RTV)
• 1:1 mix ratio
• CFC-free content
• Low post-cure compression set

• Stability and flexibility across a wide

range of temperatures

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Surface Preparation

Although

Dow Corning

silicone sealants possess excellent bond strength,

maximum adhesion is only attained on surfaces that are clean and dry.
Contaminants – such as dirt, grease, water, tar or rust – act as release
agents and prevent the formation of durable bonds. Use of a primer does
not negate the necessity for proper surface cleaning.

Wet or dirty surfaces should be properly prepared before sealants are applied.

• Wipe contaminated surface with a clean, oil-free cloth.

• Rewipe surface with a suitable cleaner or industrial solvent, such as

isopropyl alcohol (IPA), mineral spirits, naphtha or ketones. Note: Do not
clean surface with detergent or soap. (Soap residue may act as release
agent.)

• Rough rubber surfaces with sandpaper. Make a spot-check to determine

the adhesion of sealants for each application. Bond strength will increase
as the sealant cures.

The active ingredients must thoroughly wet-out and coat the bonding surfac-
es. Mild abrasion, solvent cleaning, plasma, corona discharge and other
pretreatments have been used to clean and enhance surface reactivity
to bonding. In general, light surface abrasion is recommended whenever
possible, because it promotes good cleaning and increases the surface
area for bonding. Clean and/or degrease surfaces with

Dow Corning

OS Fluids, naphtha, mineral spirits, methyl ethyl ketone (MEK), or other
suitable solvents that will remove oils and other contaminants that may be

present. A final surface wipe with acetone or IPA also may be helpful.

Some cleaning techniques may give better results than others; determine

the best technique for your application. For especially difficult-to-bond-to

surfaces, it may be necessary to increase the surface reactivity by using
chemical etchants or oxidizers or by exposing the surface to UV, corona,

plasma or flame sources. Allow solvents to completely evaporate before

applying the primer.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Primers and Adhesion Promoters

For maximum adhesion,

Dow Corning

primer is

recommended. After solvent-cleaning, apply a thin
coat of Dow Corning primer in a very light, even
coat by wiping, dipping or spraying. Wipe off excess
material to avoid overapplication, which generally
appears as a white, chalky surface. When dip- or
spray-coating, diluting by a factor of 2 to 4 with
additional solvent may avoid excessive buildup.

TABLE VII. CLEANERS AND PRIMERS

Cleaners

Primers

Dow Corning

OS-2

Silicone Cleaner and Surface Prep

Solvent

Dow Corning

DS-1000

Aqueous Silicone Cleaner

Dow Corning

DS-2025

Silicone Cleaning Solvent

Dow Corning

PR-1200 RTV

Prime Coat

Dow Corning

P5200

Adhesion Promoter

Dow Corning

1200 OS

Primer Clear

Dow Corning

Primer-C OS

Special

Features

VOC exempt (VOC = 0 g/L); certified

as a Clean Air Solvent by the

California South Coast Air Quality

Management District; easy to use;

low in toxicity; essentially odorless;

safe on plastics and noncorrosive to

metals; ideal for diluting and tailoring

the viscosity of silicones

Cleaner for use on uncured silicone;

effectively emulsifies silicone oils,

greases and uncured elastomers;

effective degreaser on a wide range

of applications; aqueous solution;

complies with EU detergent regulation

on biodegradability of surfactants;

nonflammable

Cleaner for use on cured silicone;

rapid digestion of cured silicone; leaves

silicone-free surface; nonflammable;

high flash point; does not contain

aromatic solvent; nonhalogenated

solvent; low viscosity; multiple use

and recyclable

Significantly improves the adhesion

of silicone sealants to a wide

variety of challenging substrates;

available in clear and red

Significantly improves the

adhesion of silicone sealants

with low VOC to a wide variety

of challenging substrates;

available in clear and red

Useful for both

moisture-curing-RTV

and heat-curing silicones;

diluted in low-molecular-weight

silicone fluid; meets many

international regulations for

low VOC content (including

European Union); similar to

Dow Corning

P5200

Adhesion Promoter

Improves adhesion of silicone

sealants to many substrates,

including plastics; accelerates

adhesion build of two-part

structural sealants; conforms to

South Coast and Bay Air Quality

Management District Regulations

for Architectural Sealant Primers;

user-friendly with low VOC; im-

proves quality control processes

by offering a visual confirmation

of primer presence; quick cure

time; nonstaining

Applications Cleaning plastics, metals and other

surfaces or preparing these surfaces

for painting, bonding or sealing

Cleaning surfaces, equipment and

manufacturing units contaminated

with nonsubstantive uncured silicone

residues

Cleaning surfaces, equipment and

manufacturing units contaminated with

substantive cured silicone residues

Improves the adhesion of silicone

sealants, coatings and rubber to

masonry, wood, granite, metals,

glass, ceramics, plastics, rubbers

and coatings

Improves the adhesion of

silicone sealants, coatings

and rubber to masonry, wood,

granite, plastics, rubbers and

coatings

Enhances bonding/adhesion

of RTV and heat-cure silicones

to ceramics, glass, wood,

masonry, structural plastics

(including FR-4) and many

metals

In-shop or field use with one-

and two-part Dow Corning

brand sealants; accelerating

adhesion to coated aluminum

substrates, such as polyvinylidene

fluoride (PVDF) or

Kynar

based

paints

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Primer Cure

At normal room temperatures and 50% relative humidity conditions, allow the primer to air-dry from

five to 30 minutes. Low-humidity and/or low-temperature conditions require longer cure times. Mild

heat acceleration of the cure rate may be possible, but temperatures above 140°F (60°C) are not
recommended. During application, the carrier solvent typically evaporates quickly, allowing the
active ingredients to begin to react with atmospheric moisture and bonding surfaces. For optimal
bonding, different cure times may be required for different temperature and humidity conditions;
determine the best cure schedule and conditions for your application. Apply the desired silicone
sealant after the primer, prime coat or adhesion promoter has fully cured.

TABLE VII. CLEANERS AND PRIMERS

Cleaners

Primers

Dow Corning

OS-2

Silicone Cleaner and Surface Prep

Solvent

Dow Corning

DS-1000

Aqueous Silicone Cleaner

Dow Corning

DS-2025

Silicone Cleaning Solvent

Dow Corning

PR-1200 RTV

Prime Coat

Dow Corning

P5200

Adhesion Promoter

Dow Corning

1200 OS

Primer Clear

Dow Corning

Primer-C OS

Special

Features

VOC exempt (VOC = 0 g/L); certified

as a Clean Air Solvent by the

California South Coast Air Quality

Management District; easy to use;

low in toxicity; essentially odorless;

safe on plastics and noncorrosive to

metals; ideal for diluting and tailoring

the viscosity of silicones

Cleaner for use on uncured silicone;

effectively emulsifies silicone oils,

greases and uncured elastomers;

effective degreaser on a wide range

of applications; aqueous solution;

complies with EU detergent regulation

on biodegradability of surfactants;

nonflammable

Cleaner for use on cured silicone;

rapid digestion of cured silicone; leaves

silicone-free surface; nonflammable;

high flash point; does not contain

aromatic solvent; nonhalogenated

solvent; low viscosity; multiple use

and recyclable

Significantly improves the adhesion

of silicone sealants to a wide

variety of challenging substrates;

available in clear and red

Significantly improves the

adhesion of silicone sealants

with low VOC to a wide variety

of challenging substrates;

available in clear and red

Useful for both

moisture-curing-RTV

and heat-curing silicones;

diluted in low-molecular-weight

silicone fluid; meets many

international regulations for

low VOC content (including

European Union); similar to

Dow Corning

P5200

Adhesion Promoter

Improves adhesion of silicone

sealants to many substrates,

including plastics; accelerates

adhesion build of two-part

structural sealants; conforms to

South Coast and Bay Air Quality

Management District Regulations

for Architectural Sealant Primers;

user-friendly with low VOC; im-

proves quality control processes

by offering a visual confirmation

of primer presence; quick cure

time; nonstaining

Applications Cleaning plastics, metals and other

surfaces or preparing these surfaces

for painting, bonding or sealing

Cleaning surfaces, equipment and

manufacturing units contaminated

with nonsubstantive uncured silicone

residues

Cleaning surfaces, equipment and

manufacturing units contaminated with

substantive cured silicone residues

Improves the adhesion of silicone

sealants, coatings and rubber to

masonry, wood, granite, metals,

glass, ceramics, plastics, rubbers

and coatings

Improves the adhesion of

silicone sealants, coatings

and rubber to masonry, wood,

granite, plastics, rubbers and

coatings

Enhances bonding/adhesion

of RTV and heat-cure silicones

to ceramics, glass, wood,

masonry, structural plastics

(including FR-4) and many

metals

In-shop or field use with one-

and two-part Dow Corning

brand sealants; accelerating

adhesion to coated aluminum

substrates, such as polyvinylidene

fluoride (PVDF) or

Kynar

based

paints

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Sealant Application

Apply

Dow Corning

adhesives/sealants to one of the prepared surfaces, then

quickly cover with the other substrate to be bonded. On exposure to moisture, the
freshly applied material will “skin over” in about 5 to 10 minutes (depending on the
product) at room temperature and 50% relative humidity.

Tool the sealant to coat or wet the substrate surface for maximum bonding. This

typically is done by properly filling the joint first and then dry-tooling the sealant

by pressing and pulling a round-tipped spatula or similar tool across the sealant

surface. This step forces sealant into joint surfaces and helps remove air pockets

or voids at the bond line. Tooling should be completed before the skin forms.

Keeping the primed surface clean may allow application of the silicone elastomer
to be delayed – but in some cases, if too much time elapses, lower adhesion can
result. Users are encouraged to determine the optimal cure conditions for their spe-

cific applications and the effects of any hold times imposed between applications of

the primer and sealant. In some cases, it may be recommended to reprime surfaces
if 8 to 24 hours elapse before the silicone sealant can be applied.

Cure Time

After skin formation, cure continues inward from the surface. In 24 hours (at room
temperature and 50% relative humidity),

Dow Corning

adhesive/sealant will cure to

a depth of about 1/8". Very deep sections, especially when access to atmospheric
moisture is restricted, will take longer to cure completely. Cure time is extended at
lower humidity levels.

Because the sealants cure by reaction with moisture in the air, keep the container
tightly sealed when not in use. A plug of used material may form in the tip of a tube
or cartridge during storage. This is easily removed and does not affect the remaining
contents.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Compatibility

Some

Dow Corning

adhesives/sealants release a small amount of acetic acid

during cure. This may cause corrosion on some metallic parts or substrates,
especially in direct contact or when the cure is carried out in a totally enclosed
environment that does not allow cure by-products to escape.

Platinum catalysts used in addition-cure silicone sealants – including silicone
foams – are sensitive to contamination by certain compounds that have the
power to stop or inhibit cure. For more information, refer to “Guarding against
potential inhibitors/poisons of platinum-catalyzed addition-cure release coatings,”
Form No. 30-1053-01, available in the Technical Library on

dowcorning.com

upon request from Dow Corning customer service.

Cleanup/Sealant Removal

Cured silicone can be removed from a surface with a sharp blade if the cured

silicone material is accessible. If it is difficult to cut through, solvents – such

as IPA, toluene, xylene, naphtha or mineral spirits – may be used to soften the
cured sealant.

Dow Corning

OS Fluids also can be used to help soften cured

silicone and/or remove silicone residue after it has been removed mechanically
from a surface.

Dow Corning

OS Fluids will generally be a lower-VOC alternative

to standard solvents.

Limitations

Refer to individual product data sheets for use limitations.

Health and Environmental Information

To support customers in their product safety needs, Dow Corning has an
extensive Product Stewardship organization and a team of Product Safety
and Regulatory Compliance (PS&RC) specialists available in each area.

For more information, please see our website,

dowcorning.com

, or consult

your local Dow Corning representative.

dow-corning-silicone-sealants-for-industrial-assembly-and-maintenance-html.html

Images: Cover - AV25030, AV18647, AV25027, AV25028, AV25031, AV16029, AV25029; Page 2 -
AV15217; Page 3 - AV25032, AV08170, AV14174; Page 4 - AV12315; Page 12 - AV23389; Page 15
- AV18647; Page 16 - AV13896; Page 18 - AV25202; Page 20 – AV18278

HANDLING PRECAUTIONS

PRODUCT SAFETY INFORMATION REQUIRED FOR SAFE USE IS NOT INCLUDED IN THIS
DOCUMENT. BEFORE HANDLING, READ PRODUCT AND MATERIAL SAFETY DATA SHEETS
AND CONTAINER LABELS FOR SAFE USE, PHYSICAL AND HEALTH HAZARD INFOR-
MATION. THE MATERIAL SAFETY DATA SHEET IS AVAILABLE ON THE DOW CORNING
WEBSITE AT DOWCORNING.COM, OR FROM YOUR DOW CORNING SALES APPLICATION
ENGINEER, OR DISTRIBUTOR, OR BY CALLING DOW CORNING CUSTOMER SERVICE.

LIMITED WARRANTY INFORMATION – PLEASE READ CAREFULLY

The information contained herein is offered in good faith and is believed to be accurate. However, because
conditions and methods of use of our products are beyond our control, this information should not be used
in substitution for customer’s tests to ensure that our products are safe, effective and fully satisfactory for
the intended end use. Suggestions of use shall not be taken as inducements to infringe any patent.

Dow Corning’s sole warranty is that our products will meet the sales specifications in effect at the time of

shipment.

Your exclusive remedy for breach of such warranty is limited to refund of purchase price or replace-
ment of any product shown to be other than as warranted.

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, DOW CORNING SPECIFI-
CALLY DISCLAIMS ANY OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR A
PARTICULAR PURPOSE OR MERCHANTABILITY.

DOW CORNING DISCLAIMS LIABILITY FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.

Dow Corning, Silastic

and XIAMETER are registered trademarks of Dow Corning Corporation.

We help you invent the future

is a trademark of Dow Corning Corporation.

Duranar

is a registered trademark of PPG Industries Ohio, Inc.

Fluropon

is a registered trademark of The Valspar Corporation.

Kynar

is a registered trademark of Arkema or one of its affiliates.

AGP14232

Form No. 80-8104-01

CONTACT US

For more than 60 years, OEM designers and
maintenance and materials engineers around the
world have trusted the

Dow Corning

brand for

performance and expertise to solve or prevent

sealant challenges. Dow Corning has sales offices,

manufacturing sites, and science and technology
laboratories – and a network of more than 3,000
distributors – around the world.

To learn more about our extensive product and

service offerings, order samples, or find a local

distributor, visit

dowcorning.com/IAM

, email

industrial@dowcorning.com

or call Dow Corning

Technical Customer Service at 1 800 248 2481.