

-
Description for 3M 08663 Super Silicone Adhesive/Sealants
A paste-like, one-component material which cures to a tough, rubbery solid when exposed to moisture in the air.Chemical Resistance Chemical Resistance: Fluid Resistance: Good Water Resistance Application Type Bond, Seal 1 Part or 2 Part 1-Part Material Form Paste Substrate ceramic, fabrics, glass, clean metal, many plastics, Rubber, wood, Vinyl Industry Automotive trim, Caulking joints to provide a water and dust barrier, Filleting joints to provide a water and dust barrier Manufacturer 3M Chemistry Silicone Application Method Spatula Cure Method Moisture Cure Temperature (°C) 25 Cure Time (min) Fast, 1,440 Viscosity (cPs) Non-sagging Paste Color Clear Ozone Resistance Excellent ozone resistance High Temperature Resistance (°C) High Temperature Resistance, 204 Low Temperature Resistance (°C) -60 Other Resistance Excellent Extreme resistance Density (g/cm³) 8.5 (lbs/Gallon) (Appx.) -
Technical Data for 3M 08663 Super Silicone Adhesive/Sealants
Overview
-
Chemical Resistance
- Chemical Resistance : Fluid Resistance : Water Resistance - Good Water Resistance
-
1 Part or 2 Part
- 1-Part
-
Material Form
- Paste
-
Industry
- Other Transportation - Drip rails
- Automotive - Automotive trim
- Joints - Filleting joints to provide a water and dust barrier, Caulking joints to provide a water and dust barrier
- Other - Taillight and sunroof assemblies, Vinyl roof top fabrics
-
Chemistry
-
Application Method
- Spatula/Trowel - Spatula
- Other - Wooden paddle
-
Cure Method
- Moisture / Condensation Cure - Moisture
-
Color
- Clear / Transparent - Clear
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) Fast, 1,440 Test Method Viscosity (cPs) Non-sagging Paste Bond Strength
Tensile Strength (psi) 325 Material Resistance
Ozone Resistance Excellent ozone resistance Environmental Resistance Excellent weather resistance High Temperature Resistance (°C) High Temperature Resistance, 204 Low Temperature Resistance (°C) -60 Moisture/Humidity Resistance Excellent moisture resistance Other Resistance Excellent Extreme resistance Vibration Resistance/Shock Resistance Excellent vibration resistance Hardness
Shore A Hardness 25 Test Method Elongation (%) 550 Test Method Flexibility Flexible Other Properties
% Solids (%) 100 Test Method Density (g/cm³) 8.5 (lbs/Gallon) (Appx.) Business Information
Shelf Life Details Store at room temperature. Rotate stock on a "first-in, first-out" basis. When stored at the recommended conditions in original, unopened containers, this product has a shelf life of 18 months. Shelf Life Temperature (°F) 77 Shelf Life (mon) 18 -
-
Best Practices for 3M 08663 Super Silicone Adhesive/Sealants
-
Surface Preparation
Thoroughly clean surfaces to be bonded. Rubber surfaces should be abraded and wiped clean.
-
Application
Apply silicone to area that is to be sealed or bonded. The paste-like consistency makes it easy to tool with a spatula or wooden paddle.
-
Curing
Super Silicones cure from the outside in. At conditions of 75°F and 50% RH, they form a tack free skin within 20 minutes. Tooling is not practical after the skin begins forming. Cure time is affected by humidity, degree of confinement, and thickness of the adhesive/sealant bead. Lower humidity and/or temperature will extend the cure time. Higher humidity and/or temperature will reduce the cure time. In applications where the adhesive/sealant is confined during cure, the time required for proper cure is generally lengthened.
-
-
Comparable Materials for 3M 08663 Super Silicone Adhesive/Sealants
Spec Engine® Results
Popular Articles
Infographic: ENSURING A STRONG BOND - 6 Basic Methods of Surface Preparation
Read ArticleSilicones in LED Lighting | Gluespec
Read ArticleTesting the effectiveness of surface treatments
Read ArticleWhat Are the Differences Between Adhesives and Sealants?
Read ArticleSponsored Articles
Unique Advantages of Contact Adhesives
Read ArticleUsing LOCTITE® 454™ is a Valid Option for Engineers Working with a Wide Variety of Materials
Read ArticleSylgard 184 by DOW is the Top Choice for a Transparent, Silicone Encapsulant. Read Why:
Read ArticleCase Study: Creating reliable, corrosion-free bonds with LORD® 406 acrylic adhesive
Read ArticleFeatured Ads

Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
---|---|
25°C | Exposed to air at @ 77°F and 50% RH, 1/8 inch thickness |
Cure Time Test Methods
Cure Time | Test Method |
---|---|
Fast | |
1,440 min | Exposed to air at @ 77°F and 50% RH, 1/8 inch thickness |
Tack Free Time Test Methods
Tack Free Time | Tack Free Temperature | Test Method |
---|
Elongation Test Methods
Elongation | Test Method |
---|---|
550 % | Measured on 1/4 inch thick samples cured for 72 Hrs. at 77°F and 50% RH |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method |
---|---|
25 | Measured on 1/4 inch thick samples cured for 72 Hrs. at 77°F and 50% RH |
% Solids Test Methods
% Solids | Test Method |
---|---|
100 % | Appx. |

1 VIEW FREE
Don't Leave!
View 3M - 08663 Super Silicone Adhesive/Sealants now.