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Tear strength and tensile strength
The tear strength of silicone rubber is generally around 9.8 kN/m. There are high-strength types available with tear strength between 29.4 kN/m and 49.0 kN/m, achieved through polymer modification and/or judicious selection of fillers and crosslinkers. These products are ideal for molding large items, reverse tapered forms, and complexly shaped items when high tear strength is required.
 
Temperature dependency of rubber strength

The strength of silicone rubber at room temperature is inferior to that of organic rubber, but silicone rubber maintains strength better at high temperatures, such that the two eventually trade places on the graph.
 
Tear strength test (crescent piece)