Silicone rubber compositions containing high molecular weight organopolysiloxanes

摘要

A platinum group-metal curing silicone rubber composition is claimed herein having enhanced physical properties such as tear and heat aging, especially at durometers below 35 and above 65. We have unexpectedly found that addition of diorganohydrogensiloxy end-blocked polydiorganosiloxanes and triorganosiloxy end-blocked polydiorganosiloxanes, having a viscosity greater than 10 Pa.s at 25<o>C. to silicone rubber compositions provide for superior properties.