HMS -301 by Gelest (Mitsubishi Chemical) is 25-35% (methylhydrosiloxane) 65-70% (dimethylsiloxane) copolymer. Acts as crosslinking agent for vinyl-addition silicones. This trimethylsiloxy terminated hydride functional polymer undergoes three main classes of reactivity: hydrosilylation, dehydrogenative coupling and hydride transfer.
- HMS -301 has more readily controlled reactivity than the homopolymers which results in tougher polymers with lower cross-link density.
- The preferred catalysts for the reactions are platinum complexes such as SIP6830.3 and SIP6832.2.
- In principle, the reaction of hydride functional siloxanes with vinyl functional siloxanes takes place at 1:1 stoichiometry.
- Used in encapsulant applications.
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HMS -301 properties
Other properties
| Properties | Value & unit | Test condition | Test method |
|---|---|---|---|
| Amine Hydrogen Equivalent Weight (AHEW) | 0.0 Visible After Login | Visible After Login | Visible After Login |
| Boiling Point | 0.0 Visible After Login | Visible After Login | Visible After Login |
| Melting Point | 0.0 Visible After Login | Visible After Login | Visible After Login |
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| Refractive Index | 0.0 Visible After Login | Visible After Login | Visible After Login |
| Specific Gravity | 0.0 Visible After Login | Visible After Login | Visible After Login |
| Viscosity | 0.0 Visible After Login | Visible After Login | Visible After Login |