Silicones & Silicates
REACH
Polymethylhydrosiloxane
CAS Number
63148-57-2
EC Number
613-152-3
Abbreviation
PMHS
What is Polymethylhydrosiloxane?
Polymethylhydrosiloxane (CAS 63148-57-2), commonly abbreviated as PMHS, is a hydrogen-functional silicone polymer.
Where is Polymethylhydrosiloxane used?
- Textile and leather finishing: soft-hand effects and water-repellent coatings that withstand repeated washing
- Building and construction: impregnation of masonry, concrete and stone surfaces, creating moisture barriers without altering substrate appearance
- Personal care: conditioning and slip agent in hair and skin formulations
- Lubricants and metalworking: anti-foam additive and process aid in cutting fluids and industrial oil systems
- Its reactive Si-H groups make it a crosslinker, reducing agent and surface treatment agent.
Commercial specifications
- Viscosity grades from low to medium
Other Names (Synonyms)
Polysiloxanes, Me hydrogen|Siloxanes and Silicones, Me hydrogen|Me hydrogen siloxanes|SI 4087|SPBD 88017|PMHS
What are the physical properties of Polymethylhydrosiloxane?
Melting Point <-60°C
Boiling Point 142 °C(lit.)
Density 1.006 g/mL at 25 °C(lit.)
Flash Point 82 °F
Form liquid
Water Solubility Not miscible or difficult to mix in water.
Vapor Pressure 38 hPa (20 °C)
Refractive Index n 20/D 1.382(lit.)
pH 7 (H2O)
Which trade and regulatory codes apply to Polymethylhydrosiloxane?
HS Code 39100000
WGK (Germany) 3