Hexamethylcyclotrisiloxane , >98.0%(GC) , 541-05-9

Synonym(s):
Cyclic (D3) permethylsiloxane

CAS NO.：541-05-9

Empirical Formula: C6H18O3Si3

Molecular Weight: 222.46

MDL number: MFCD00005943

EINECS: 208-765-4

PRODUCT Properties

• Melting point: 50-64 °C (lit.)
• Boiling point: 134 °C (lit.)
• Density: 1.02
• vapor density: 1 (vs air)
• vapor pressure: 0.014-671Pa at 24.85-25℃
• RTECS: GZ4705000
• Flash point: 95 °F
• storage temp.: Inert atmosphere,Room Temperature
• solubility: soluble in most organic solvents.
• form: solid
• Specific Gravity: 1.02
• color: White to Almost white
• Water Solubility: may decompose
• Sensitive: Moisture Sensitive
• Hydrolytic Sensitivity: 1: no significant reaction with aqueous systems
• BRN: 1766829
• Stability: Stable, but moisture sensitive. Incompatible with strong oxidizing agents. Highly flammable.
• LogP: -0.38-4.4 at 20-25℃

Description and Uses

Hexamethylcyclotrisiloxane can be used as reagent for the preparation of dimethylsilanols, trapping of insitu- generated silanones, silylenes, silyl azides, silanethiones, and derivatives. Hexamethylcyclotrisiloxane, (D3) is the simplest member of a series of cyclic oligodimethylsiloxanes, primarily used as synthetic equivalents for the reactive intermediate dimethylsilanone. This characteristic is responsible for its extensive application in polymer chemistry. Hexamethylcyclotrisiloxane has also been exploited as an efficient trapping reagent for a variety of shortlived intermediates, including silanones and silyenes. The ability of D3 to intercept these reactive species has been attributed to its rigid, planar structure,8 and the resultant release of strain from ring expansion.

Safety

• Symbol(GHS): GHS02
• Signal word: Danger
• Hazard statements: H228
• Precautionary statements: P210-P240-P241-P280-P370+P378
• Hazard Codes: F,Xi
• Risk Statements: 11-36/37/38
• Safety Statements: 26
• RIDADR: UN 1325 4.1/PG 2
• WGK Germany: 3
• TSCA: Yes
• HazardClass: 4.1
• PackingGroup: II
• HS Code: 29319090