Silicone adhesive

Description

A water-resistant, flexible adhesive. Silicone adhesives contain easily hydrolyzable end groups, such as acetates, that are designed to crosslink (i.e. cure) when exposed to water vapor in the air. The type of end-group that is used will determine the type of emmissions that are release during curing. For example, the acetate engroups, such as acetoxy, will release acetic acid that is corrosive. An oxime end group release ketoxime and an alkoxy endgroup will release methanol. Most silicone adhesives cures at room temperature (RTV: Room Temperature Vulcanization) with 24 hours at ambient temperatures. Some can cure faster when heated or exposed to UV light.

Examples:

Product	Cure process	By-Product
Dowsil 744 RTV Adhesive Sealant	alkoxy/methoxy	methanol
Dowsil 781 Acetoxy Rapid-cure Silicone	acetoxy	Acetic acid
Dowsil 832 Multi-surface Adhesive Sealant	alkoxy	methanol
Dowsil 1080 Oxime Sealant	Oxime	ketoxime
Dowsil 3145 RTV MIL-A-46146 Adhesive Sealant	alkoxy/methoxy	methanol

Synonyms and Related Terms

silicone mastic (Br.); adhesivo de silicona (Esp.); colle silicone (Fr.); colla siliconica (It.); adesivo de silicone (Port.)

Risks

• May release Acetic acid or Methanol during cure

Resources and Citations

• Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977