Diacetoxydimethylsilane Property

Melting point:

-12.5 °C (lit.)

Boiling point:

163 °C (lit.)

Density 

1.054 g/mL at 25 °C (lit.)

refractive index 

n20/D 1.403(lit.)

Flash point:

153 °F

form 

liquid

Specific Gravity

1.054

color 

Colorless to Light yellow to Light red

Hydrolytic Sensitivity

7: reacts slowly with moisture/water

BRN 

1769843

CAS DataBase Reference

2182-66-3(CAS DataBase Reference)

NIST Chemistry Reference

Silanediol, dimethyl-, diacetate(2182-66-3)

EPA Substance Registry System

Silanediol, dimethyl-, diacetate (2182-66-3)

Safety

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-28-36/37/39-45

RIDADR 

UN 3265 8/PG 3

WGK Germany 

3

F 

10-21

TSCA 

Yes

HazardClass 

3.2

PackingGroup 

III

HS Code 

29319090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P363Wash contaminated clothing before reuse.

P405Store locked up.

Diacetoxydimethylsilane Chemical Properties,Usage,Production

Features

Dimethyldiacetoxysilane 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.
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.

Chemical Properties

Colorless or yellowish transparent liquid