Physical Properties

Appearance: Colorless, odorless, transparent oily liquid
Boiling point (°C, 101.3 kPa): 176
Melting point (°C): 17–18
Relative density (g/mL, 20/4°C): 0.9558
Refractive index (20°C): 1.3958
Flash point (°C): 60
Solubility: Miscible with organic solvents; insoluble in water
Freezing point (°C): 13.9–17.5

It can undergo ring-opening polymerization under acid or base catalysis to form silicone polymers, serving as a key raw material for silicone products.

Main Applications

Intermediate for silicone oil and silicone rubber; also used as solvent for preparing methyl silicone oil.
Used in hair care cosmetics (hair conditioners, hair curlers, fixatives, hair sprays, dry shampoos, etc.) to make hair smooth, soft and easy to comb.
As a silicone monomer for synthesizing silicone polymers.

Registry Numbers

CAS No.: 556-67-2

MDL No.: MFCD00003269

EINECS No.: 209-136-7

RTECS No.: GZ4397000

BRN No.: 1787074

Safety Information

RTECS No.: GZ4397000

WGK Germany: 1

Hazard Class: 3

Safety Instructions (S): S36/37–S46–S51–S61

Packing Group: III

UN Dangerous Goods Code: UN 1993 3/PG 3

Hazard Symbol: Xn (Harmful)

Risk Codes (R): R53; R62