Name: SiSiB® PC7960
Brand: Nanjing SiSiB Silicones Co., Ltd.
Price: 100 USD

Technical Data

CAS No.	4130-08-9
EINECS No.:	223-943-1
Formula	C₈H₁₂O₆Si
Molecular Weight	232.26
Boiling Point	112°C [760mmHg]
Flash Point	88°C

Color and Appearance	Colorless or yellowish clear liquid
Density _25/25_°C	1.167
Refractive Index_[2₀_°C]	1.423 [25°C]
Active Content	95.0%

Application

SiSiB® PC7960 vinyltriacetoxysilane, VTAS 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.