Difference between revisions of "Silicone sealant"

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== Description ==
 
== Description ==
  
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A water-resistant, flexible adhesive (caluk or sealant). Silicones contain easily hydrolyzable end groups, such as acetates, that are designed to crosslink when exposed to water vapor in the air. There are now three types of curing for these types of adhesives and sealants:
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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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* The acetoxy cure silicones may release [[acetic%20acid|acetic acid]] or [[methanol|methanol]] during cure.
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For more information see [[silicone cure systems]].
  
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* The alkoxy cure silicones may release xxxxx
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{| class="wikitable"
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|-
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* The ethoxy cure silicones may release xxx
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! <br />
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! <br />Acetic-cure   silicones
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In general, if the silicone adhesive is listed as 'neutral cure' it will not release acetic acid.
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! <br />Alkoxy  neutral-cure silicones
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! <br />Oxime neutral-cure   silicones
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|-
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| <br />Maximum  temperature
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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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|-
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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]]
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|}
  
 
== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
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silicone mastic (Br.); adhesivo de silicona (Esp.); colle silicone (Fr.); colla siliconica (It.); adesivo de silicone (Port.)
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silicone caulk; silicone mastic (Br.); adhesivo de silicona (Esp.); colle silicone (Fr.); colla siliconica (It.); adesivo de silicone (Port.)
  
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== Hazards and Safety ==
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==Resources and Citations==
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May
 
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== Sources Checked for Data in Record ==
 
  
 
* Irving Skeist, ''Handbook of Adhesives'', Van Nostrand Reinhold Company, New York, 1977
 
* Irving Skeist, ''Handbook of Adhesives'', Van Nostrand Reinhold Company, New York, 1977
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* Silicone Technologies: [http://www.siliconetechnologies.com/silicone-adhesive-sealant-gel-conformal-coating-cure-technical-info.html Silicone cure systems]
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 14:20, 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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