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9004-73-3

Name Polymethylhydrosiloxane
CAS 9004-73-3
Molecular Formula (CH3)3SiO[(CH3)HSiO] nSi(CH3)
MDL Number MFCD00084478
Molecular Weight 115.226
MOL File 9004-73-3.mol

Chemical Properties

Appearance clear colorless viscous liquid
Boiling point  >177 °C(lit.)
density  1.006 g/mL at 25 °C(lit.)
refractive index  n20/D 1.398
Fp  250 °F
solubility  most ethereal, chlorinated, or hydrocarbon solvents as well as EtOH, i-PrOH, warm DMF, and warm NMP; insoluble in MeOH, DMSO, acetonitrile, and water.
form  Viscous Liquid
color  Clear colorless
Water Solubility  PRACTICALLY INSOLUBLE
Sensitive  Moisture Sensitive
Uses
methicone is a type of silicone used primarily in the formulation of free-flowing cosmetic powders. Methicone can also be found in cosmetic preparations as a skin surface sealant to reduce transepidermal water loss.
CAS DataBase Reference 9004-73-3(CAS DataBase Reference)
EPA Substance Registry System Poly[oxy(methylsilylene)] (9004-73-3)

Safety Data

Hazard Codes  Xi
Risk Statements 
R10:Flammable.
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) .
S24/25:Avoid contact with skin and eyes .
WGK Germany  3
HS Code  39100000

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