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Abstract
A HEAT CURABLE ELASTOMERIC SILICONE COMPOSITION CONSISTING OF: (A) 100 PARTS BY WEIGHT OF POLYDIORGANOSILOXANE HAVING A DEGREE OF POLYMERIZATION OF AT LEAST 3,000 AND CONTAINING AT MOST 0.3 MOLE PERCENT OF VINYL GROUP-CONTAINING SILOXANE UNITS; (B) FROM 1 TO 10 PARTS BY WEIGHT OF POLYDIORGANOSILOXANE HAVING A DEGREE OF POLYMERIZATION OF AT LEAST 3,000 AND CONTAINING FROM 5 TO 20 MOLE PERCENT OF VINYL GROUP-CONTAINING SILOXANE UNITS; (C) FROM 0.5 TO 5 PARTS BY WEIGHT OF POLYDIORGANOSILOXANE HAVING A DEGREE OF POLYMERIZATION OF FROM 10 TO 1,000 AND CONTAINING FROM 5 TO 90 MOLE PERCENT VINYL GROUP-CONTAINING SILOXANE UNITS; (D) FRO 20 TO 200 PARTS BY WEIGHT OF A SILICA FILLER HAVING A SURFACE AREA OF AT LEAST 150 M.2/G; AND (E) A CATALYTIC AMOUNT OF ORGANIC-PEROXIDE. THE COMPOSITION IS CURED TO YIELD A SILICONE RUBBER HAVING A HIGH TEAR STRENGTH, OR IT IS EMPLOYED AS A WIREINSULATING MATERIAL, SEALING MATERIAL AND PACKING MATERIAL, BECAUSE OF ITS EXCELLENT COMPRESSION SET, RESILIENCY, HEAT-, STEAM-, AND WEATHER-RESISTANCE AND ELECTRICAL PROPERTIES.
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