Silicone sealant

Description

A water-resistant, flexible adhesive (caulk or sealant). Silicones contain easily hydrolyzable end groups, such as acetates, that are designed to crosslink when exposed to water vapor in the air. Since they crosslink at room temperature (within 24 hours), they are often call RTV silicones (Room Temperature Vulcanization). Some types of one-part curing include:

• Acetoxy cure silicones may release Acetic acid during cure.
• Alkoxy Neutral cure silicones may release Methanol or other alcohols during cure.
• Other Neutral cure silicones may release methyl ethyl ketoxime or Acetone during cure.

Other types of silicone systems use a catalyst for cure. These are called 2-part systems.

Acetic-cure siliconesAlkoxy neutral-cure silicones Oxime neutral-cure silicones Maximum temperature +200°C/+392°F (+275°C/+527°F for high-temperature SKUs) +180°C (+356°F)+220°C (+428°F) OdorStrong (vinegar)Slight Slight Unsuitable substrates Corrosion-sensitive metals (copper	crude steel	crude aluminum	iron	zinc	lead	etc.) None Polycarbonate and PMMA (stress cracking) copper (discoloration) Smoothing agentSoapy water/Silicone liquidsSilicone liquidsSilicone liquids

Synonyms and Related Terms

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

Resources and Citations

• Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977
• Silicone Technologies: Silicone cure systems