Overview
Polymethylhydrosiloxane (CAS 63148-57-2 ), commonly abbreviated as PMHS, is a hydrogen-functional silicone polymer used across industrial and specialty chemical markets.
Its reactive Si-H groups make it a practical crosslinker, reducing agent, and surface treatment agent in formulations where durable hydrophobic performance is required.
In textile and leather finishing, PMHS delivers soft-hand effects and water-repellent coatings that withstand repeated washing cycles for high-performance materials.
Building and construction formulators use it to impregnate masonry, concrete, and stone surfaces, creating long-lasting moisture barriers without altering substrate appearance.
Personal care manufacturers incorporate PMHS as a conditioning and slip agent in hair and skin formulations where a lightweight, non-greasy feel is the target.
In lubricant and metalworking applications, it functions as an anti-foam additive and process aid, controlling foam in cutting fluids and industrial oil systems.
PMHS is supplied as a clear to slightly hazy liquid, with viscosity grades ranging from low to medium to suit different coating and formulation processes.
It is available in technical grade , which covers the majority of industrial applications across construction, textiles, and lubricants for global buyers.
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Physical Properties
| 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) |
Trade & Regulatory
| HS Code | 39100000 |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 63148-57-2
- EC Number
- 613-152-3
- Mol. Weight
- -
- HS Code
- 39100000
- Category
- Silicones & Silicates