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Silicone sealants

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Silicon-based Dow Corning sealants last longer and are more versatile than most organic polymer sealants. They are durable, one part 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.

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Features of Dow Corning silicone sealants include:
● Stability over a wide temperature range – When fully cured, our products can be used at temperatures ranging from -65° to 350°C.
● Weather resistance – High resistance to 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 temperature range.
● Low Flammability – In fire conditions, silicone adhesives/sealants are reluctant to burn. Many products comply with UL flammability standards.

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 60 years of expertise and innovations. 

Cure Type-Acetoxy

Dow Corning
Product

MSDS

Special Features Temperature Range [°C] (intermittent)* Color(s) Skin-Over Time [min.] Tack Free Time [min.] Durometer [Shore A] Tensile [MPa] Elongation [%] Listing/
Specifications

Dow Corning Silicone AP

Silicone AP Multi-purpose -50 to + 180 clear, white, grey, black 11 21 25 2.2 540  
Dow Corning 730 730 Solvent resistant -65 to + 200 white 5 25 37 2.3 240
Dow Corning 732 732 Multi-purpose, FDA, UL, MIL -60 to + 180 (205) clear, white, black 7 20 25 2.3 540 FDA 177.2600, UL94-HB, NSF51, NSF61, MIL-A-46106
Dow Corning 734 734 Flowable -65 to+ 180 clear, white 7 13 27 1.5 315 FDA 177.2600, UL94-HB, NSF51, NSF61, MIL-A-46106
Dow Corning 736 736 High temperature resistant -60 to + 260 (315) red 10 17 26 2.4 600 FDA 177.2600, UL94-HB, NSF51, NSF61, MIL-A-46106
Dow Corning 752 752 Multi-Purpose, High Temperature -50 to+200 clear, white, black 10-15 20-25 24 2.4 490  
Dow Corning Q3-1566 Q3-1566 Very high temperature resistant -50 to + 275 (350) black 5 12 43 3.6 340

Dow Corning

Q3-3379

Q3-3379 High temperature resistant, Flowable -50 to + 250 (275) red 8 20 34 3.2 290

Cure Type -Neutral

Dow Corning
Product

MSDS

Special Features Temperature Range [°C] (intermittent)* Color(s) Skin-Over Time [min.]Skin-Over Time [min.] Tack Free Time [min.] Durometer [Shore A] Tensile [MPa] Elongation [%] Listing/
Specifications
Dow Corning 7091 7091 Multi-purpose -55 to + 180 white, grey, black 15 28 37 2.5 680
Dow Corning 7093 7093 Multi-purpose, Low modulus -55 to + 180 white, grey, black 15 28 30 1.7 700
AS 7096 Multi-purpose, Translucent -50 to + 150 clear 10 30 18 1.3 500
748 Multi-purpose, Food contact -55 to + 177 white 15 46 35 1.9 350 FDA 177.2600, UL94-HB, MIL-A-46106
Dow Corning 3140 3140 Flowable -55 to + 180 clear 15 70 32 3.1 425 UL94-V-1, MIL-A-46146
Dow Corning 3145 3145 MIL-Specified, High Tensile Strength -55 to + 180 clear, grey 15 65 45 7.1 650

 

 

Dow Corning 3559 3559 Fast cure, High temperature resistant, Oxime cure type -50 to+ 220 black 5 24 40 1.7 450
Dow Corning HM-2500 HM-2500 Immediate green strength, Alkoxy cure type -32 to+ 93 clear - - 60 2.4 1000

  

Substrate Preparation
Although Dow Corning silicone sealants possess excellent bond strength, maximum adhesion is only attained on surfaces which are clean and dry. Contaminants, such as dirt, grease, water, tar or rust act as release agents and prevent the formation of durable bonds.
It is strongly recommended, therefore, that wet or unclean surfaces 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 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.

How to Apply
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 5-10 minutes (depending on the product) at room temperature and 50% relative humidity. Any tooling should be completed before this skin forms. The surface is easily tooled with a spatula.
Use of Primer
For maximum adhesion, the use of Dow Corning primer is recommended. After solvent cleaning, a thin coat of Dow Corning primer is applied by wiping, brushing or spraying. At normal room temperatures and humidity conditions (room temperature, 50% relative humidity), the primer should be allowed to air dry from 5 to 30 minutes. The primer cures in contact with air moisture, low humidity will necessitate longer drying time.
The required drying time for a specific area should be determined prior to use. Primer which was allowed to cure extensively will not promote adhesion anymore. As a general rule, drying time of more than 6 hours at normal temperatures and humidity should be avoided.
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 3mm. 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.
As 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.
Compatibility
Some Dow Corning adhesives/sealants release a small amount of aceticacid 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 which would not allow cure by-products to escape.
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.
DOW CORNING SPECIFICALLY 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.

 

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