Difference between revisions of "Silicone adhesive"
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Revision as of 17:04, 19 May 2020
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 | methaonl | ||
| 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.)
Hazards and Safety
May release Acetic acid or Methanol during cure
Sources Checked for Data in Record
- Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977