SiSiB® PC7970 Propyltriacetoxysilane
SiSiB® PC7970
Propyltriacetoxysilane
SiSiB® PC7970 is a colourless to yellowish liquid, not miscible with water, decomposes with water and moisture under formation of acetic acid.
Technical Data
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CAS No. |
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EINECS No.: |
241-816-9 |
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Formula |
C9H16O6Si |
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Molecular Weight |
248.31 |
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Boiling Point |
236°C [760mmHg] |
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Flash Point |
81°C |
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Color and Appearance |
Colorless or yellowish clear liquid |
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Density 25/25°C |
1.112 |
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Refractive Index [20°C] |
1.43 |
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Active Content |
98.00% |
Application
SiSiB® PC7970 propyltriacetoxysilane, PTAS silane, is used as a raw material (crosslinker) for acetoxy crosslinking RTV-1 sealants.
Acetoxy silanes are more reactive than alkoxy silanes. Acetoxy silanes are frequently used as one-component mixtures to make RTV-1 silicone sealants. These mixtures have an excess of multi-functional acetoxy silane added to silanol-terminated PDMS, which results in a PDMS chain with acetoxy groups at the ends.
When this compound is exposed to moisture some acetoxy groups are hydrolyzed and self-condense or react with other acetoxy and rapid crosslinking takes place. Acetic acid formation is one of the driving forces of this reaction.
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