Silicone sealant

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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 silicone curing systems include: acetic-cure cure; alkoxy neutral-cure and oxime neutral-cure. A comparison for some of their properties are listed below. Other types of silicone systems use a catalyst for cure. These are called 2-part systems.

For more information see Silicone cure systems.

Acetic-cure silicones

Alkoxy neutral-cure silicones

Oxime neutral-cure silicones

Maximum temperature


+180°C (+356°F)

+220°C (+428°F)


Strong (vinegar)



Unsuitable substrates

Corrosion-sensitive metals (Copper, crude steel, crude aluminum, iron, zinc, lead, etc)


Polycarbonate and PMMA (stress cracking and copper discoloration)

Smoothing agents

Soapy water/Silicone liquids

Silicone liquids

Silicone liquids

Released volatiles

Acetic acid

Methanol, other alcohols

methyl ethyl ketoxime, Acetone

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

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