The Methyltriacetoxysilane (MTAC) 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.

Technical Properties

Empirical Formula	C7H12O6Si
Molecular Weight	220.25
Boiling Point	87°C [3mmHg]
Flash Point	85°C
Color and Appearance	Colorless or yellowish transparent liquid
Density [25°C]	1.175
Refractive Index [25°C]	1.4083[25°C]
Purity	95% by GC

Applications

Methyltriacetoxysilanes (MTAC) 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.

Packings

Net weight 200 Kg steel drum or 1000 Kg IBC container

Methyltriacetoxysilane (MTAC)

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Acetoxy Silane

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Yellowish Methyltriacetoxysilane

image. Older specimen. Note the once-red universal veil becomes yellowish on the cap (exposed) and is still red on the stipe bulb (presumably exposed for the photo).

Multi-Functional Acetoxy Silane

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