Brand Dowsil Application Type Bond, Sealant, Gasketing: Formed-in-Place Gasket (FIPG) 1 Part or 2 Part 1 Part Material Form Paste Substrate Ceramic, Glass, Metal, Plastic, Painted steel, Aluminum, Rubber Industry Advanced driver-assistance systems (ADAS), E-Mobility Solutions, Airbag, Powertrain, Power Tools, Smart Home Devices, Headlamp assemblies Manufacturer Dow Chemistry Silicone Application Method Spatula Cure Method Moisture, Alkoxy cure system Cure Temperature (°C) 20 to 25, 23, 20 to 25 Cure Time (min) 10,080, 1,440 Viscosity (cPs) Non-sag, Non-slump Color Black, Gray, White High Temperature Resistance (°C) 180 Low Temperature Resistance (°C) -40 Durability Tough
Technical Data for Dow Dowsil 7091 Adhesive Sealant
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Control Module
- Advanced driver-assistance systems (ADAS)
- E-Mobility Solutions
- Headlamp - Headlamp assemblies
- Smart Home Devices
- Industrial - Engineering applications
- Power Tools
- Spatula/Trowel - Spatula
- Moisture / Condensation Cure - Moisture
- Other - Alkoxy cure system
Cure Temperature (°C) 20 to 25, 23, 20 to 25 Test Method Cure Time (min) 10,080, 1,440 Test Method Viscosity (cPs) Non-sag, Non-slump Tack Free Time (min) 28, 30 Test Method Work / Pot Time (min) 15, 10 to 15 Test Method Thixotropic Thixotropic
General Bond Strength (psi) Excellent Tear Strength (piw) 15 (kN/m) Test Method Tensile Strength (psi) 2.5 (Mpa) Test Method
High Temperature Resistance (°C) 180 Low Temperature Resistance (°C) -40
Durability Tough Shore A Hardness 32 Test Method Elongation (%) 680 Test Method Flexibility Flexible
Specific Gravity 1.400 Test Method
Shelf Life Details When stored at or below 30°C (86°F) in the original unopened containers, this product has a usable life of 12 months from the date of production. Shelf Life Type From the date of production Shelf Life (mon) 12
Not Good For
Don't Use With Low-energy plastics, Polyethylene, polypropylene, PTFE, Bad Substrates
Best Practices for Dow Dowsil 7091 Adhesive Sealant
All surfaces must be clean and dry. Degrease and wash off any contaminants that could impair adhesion. Suitable solvents include isopropyl alcohol, acetone or methyl ethyl ketone.
Good unprimed adhesion may be obtained on a variety of substrates, including enamelled and painted steel, aluminum, ceramic, glass and certain plastics. Substrates to which good adhesion is normally not obtained include PTFE, polyethylene, polypropylene and related materials.
For maximum adhesion, the use of Dow Corning® 1200 OS Primer is recommended. After solvent cleaning apply a thin coat of Dow Corning 1200 OS Primer by dipping, brushing or spraying. Allow primer to dry for 15 to 90 minutes at room temperature and a relative humidity of 50% or higher.
Apply a bead of Dow Corning® 7091 Adhesive/Sealant (see Handling Precautions) 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 10-15 minutes at room temperature and 50% relative humidity. Any tooling should be completed before this skin forms. The surface is easily tooled with a spatula. The adhesive/sealant will be tack-free in approximately 30 minutes.
Easy to apply
After skin formation, cure continues inward from the surface. In 24 hours (at room temperature and 50% relative humidity) Dow Corning 7091 Adhesive/Sealant will cure to a depth of about 2mm. 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. Before handling and packaging bonded components, users are advised to wait a sufficiently long time to ensure that the integrity of the adhesive seal is not affected. This will depend on many factors and should be determined by the user for each specific application.
Adhesion may be less successful on low-energy plastics such as Polyethylene, Polypropylene and PTFE. Users should do preliminary tests in each specific application to ensure satisfactory results.
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Cure Temperature Test Methods
|Cure Temperature||Cure Time Test Method|
|20 to 25°C||When exposed to moisture in the air|
|23°C||Cured 7 days in air at 23°C (73°F) and 50% relative humidity|
|20 to 25°C||50% relative humidity|
Cure Time Test Methods
|Cure Time||Test Method|
|10,080 min||Cured 7 days in air at 23°C (73°F) and 50% relative humidity|
|1,440 min||50% relative humidity|
Tack Free Time Test Methods
|Tack Free Time||Test Method|
|28 min||CTM 0095, ASTM MIL-S-8802E, Tack-free time is the time required for the product to develop a non-tacky surface based on adhesion to a polyethylene film.|
Work / Pot Time Test Methods
|Work / Pot Time||Test Method||Temperature|
|15 min||CTM 0098|
|10 to 15 min||50% relative humidity||20 to 25°C|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Cure Temperature||Cure Humidity||Test Method|
|2.5 (Mpa)||10,080 min||23°C||50 %||CTM 0137A, ASTM D 412|
Tear Strength Test Methods
|Tear Strength||Cure Time||Cure Temperature||Cure Humidity||Test Method|
|15 (kN/m)||10,080 min||23°C||50 %||CTM 0137 A, ASTM D 412, Die B|
Elongation Test Methods
|680 %||CTM 0137A, ASTM D412, cured 7 days in air at 23°C (73°F) and 50% relative humidity, At break|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method||Hardness Temperature|
|32||CTM 0099, ASTM D2240, cured 7 days in air at 23°C (73°F) and 50% relative humidity, Durometer||23°C|
Specific Gravity Test Methods
|Specific Gravity||Temperature||Test Method|
|1.400||22°C||CTM 0022, ASTM D0792, cured 7 days in air at 23°C (73°F) and 50% relative humidity|