Silane Crosslinkers | Acetoxy Silanes | Acidic crosslinkers

SiSiB® PC7980

Synonym: Triacetoxy phenyl silane

Chemical Structure


SiSiB® PC7980 is a clear to yellowish liquid with acrid odor of acetic acid (vinegar). It hydrolyzes in the presence of moisture (acetic acid is released) to form silanols, which can react with themselves to pro-duce siloxanes or bind to inorganic substrates.

Typical Physical Properties

Chemical Name: Phenyltriacetoxysilane
CAS No.: 18042-54-1
EINECS No.: 241-952-9
Empirical Formula: C12H14O6Si
Molecular Weight: 1282.32
Boiling Point: 291°C [760mmHg]
Flash Point: 108°C
Color and Appearance: Colorless or yellowish transparent liquid
Density [25°C]: 1.19
Refractive Index [25°C]: 1.495
Purity: 95.0% by GC


Acetoxy silanes are more reactive than alkoxysilanes. 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.


Customized product packing is 100ml, 250ml, 500ml, 1L and 5L bottle. Industrialized product packing is 210L steel drum or 1000L IBC tote, for more details, please visit Packing Centre.

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