categories.silicone-intermediates

silicone intermediates

Hydrogen-Terminated Silicone Oil (H-PDMS)

CAS: 70900-21-9

Hydrogen-terminated polydimethylsiloxane (H-PDMS) carries reactive Si-H groups exclusively at both chain ends, making it the preferred chain-extender and crosslinker in platinum-catalyzed addition-cure silicone rubber systems. Si-H content (0.03–0.5 wt%) and viscosity (2–1000 cSt) define reactivity: low-viscosity grades (2–10 cSt) act as crosslinkers; higher-viscosity grades (100–1000 cSt) serve as chain extenders and surface-treatment intermediates. Unlike side-chain hydride PDMS (PMHS), the terminal Si-H placement gives controlled network topology and predictable cure kinetics.