1,1,3,3,5,5-HEXAMETHYLTRISILOXANE

CAS NO.：1189-93-1
Empirical Formula: C6H20O2Si3
Molecular Weight: 208.48
MDL number: MFCD00039788
EINECS: 214-716-8
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-27 23:33:36

What is 1,1,3,3,5,5-HEXAMETHYLTRISILOXANE?

Chemical properties

clear colorless liquid

The Uses of 1,1,3,3,5,5-HEXAMETHYLTRISILOXANE

1,1,3,3,5,5-Hexamethyltrisiloxane is involved in the preparation of 2-bis(3-allyl-4-hydroxyphenyl)hexafluoropropane, which is associated with inorganic siloxane polymer and used as a coating material for the detection of toxic chemical warfare agents. It is also used as a silylating agent and to prepare 1,5-Bis[2-(1,2-epoxycyclohex-4-yl)ethyl]-1,1,3,3,5,5-hexamethyltrisiloxane from 4-vinyl-1-cyclohexene-1,2-epoxide by hydrosilylation.

Properties of 1,1,3,3,5,5-HEXAMETHYLTRISILOXANE

Melting point:	-67°C
Boiling point:	128 °C (lit.)
Density	0.822 g/mL at 25 °C (lit.)
refractive index	n20/D 1.383(lit.)
Flash point:	59 °F
storage temp.	Flammables area
form	clear liquid
Specific Gravity	0.822
color	Colorless to Almost colorless
Water Solubility	Slightly miscible with water.
Sensitive	Moisture Sensitive
Hydrolytic Sensitivity	3: reacts with aqueous base
BRN	1746341
CAS DataBase Reference	1189-93-1(CAS DataBase Reference)
EPA Substance Registry System	Trisiloxane, 1,1,3,3,5,5-hexamethyl- (1189-93-1)

Safety information for 1,1,3,3,5,5-HEXAMETHYLTRISILOXANE

Signal word	Danger
Pictogram(s)	Flame Flammables GHS02
GHS Hazard Statements	H225:Flammable liquids
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking.