Difference between revisions of "Silicone sealant"

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== Description ==
 
== Description ==
  
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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 curing include:
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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.
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Other types of silicone systems use a catalyst for cure.  These are called 2-part systems.
  
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* Acetoxy cure silicones may release [[acetic%20acid|acetic acid]] during cure. 
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For more information see [[silicone cure systems]].
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* Alkoxy Neutral cure silicones may release [[methanol|methanol]] or other alcohols during cure. 
 
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* Other Neutral cure silicones may release methyl ethyl ketoxime or [[acetone]] during cure.
 
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Other types of silicone systems use a catalyst for cure.  These are called 2-part systems.
 
  
 
{| class="wikitable"  
 
{| class="wikitable"  
 
|-
 
|-
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! 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
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! <br />
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! crude steel
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! <br />Acetic-cure   silicones
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! crude aluminum
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! <br />Alkoxy  neutral-cure silicones
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! iron
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! <br />Oxime neutral-cure   silicones
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! zinc
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|-
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! lead
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| <br />Maximum   temperature
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! etc.) None Polycarbonate and PMMA (stress cracking)  copper (discoloration) Smoothing agentSoapy water/Silicone liquidsSilicone liquidsSilicone liquids
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| <br />+200°C/+392°F
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| <br />+180°C (+356°F)
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| <br />+220°C (+428°F)
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|-
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| <br />Odor
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| <br />Strong  (vinegar)
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| <br />Slight
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| <br />Slight
 +
|-
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| <br />Unsuitable   substrates
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| <br /> Corrosion-sensitive metals (Copper, crude steel, crude aluminum, iron, zinc, lead, etc)
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| <br />None
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| <br />Polycarbonate and PMMA (stress cracking and copper discoloration)
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|-
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| <br />Smoothing   agents
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| <br />Soapy  water/Silicone liquids
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| <br />Silicone  liquids
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| <br /> Silicone liquids
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|-
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| <br />Released volatiles
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| <br />[[acetic%20acid|acetic acid]]
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| <br />[[methanol|methanol]], other alcohols
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| <br />methyl ethyl ketoxime, [[acetone]]
 
|}
 
|}
 +
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  

Latest revision as of 13:20, 12 September 2023

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 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
+200°C/+392°F
+180°C (+356°F)
+220°C (+428°F)

Odor
Strong (vinegar)
Slight
Slight

Unsuitable substrates
Corrosion-sensitive metals (Copper, crude steel, crude aluminum, iron, zinc, lead, etc)
None
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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