Abstract: The present invention relates to a heat-dissipating gel-type silicone rubber composition including an organopolysiloxane, wherein the heat-dissipating gel-type silicone rubber composition further includes, with respect to 100 parts by weight of the organopolysiloxane, 0.1-25 parts by weight of an organo-hydrogen polysiloxane, 1,100-2,000 parts by weight of a filler, 5-50 parts by weight of a filler surface-treating agent, and 0.1-5 parts by weight of a catalyst, wherein the organopolysiloxane and the organo-hydrogen polysiloxane each include 1,000 ppm or less of a cyclic siloxane therein.

Abstract: Embodiments relate to an organopolysiloxane composition which includes: an organopolysiloxane polymer containing a silicon-bonded hydroxyl group or a silicon-bonded hydrolysable group; light calcium carbonate having a specific surface area according to the BET method of 15 to 35 m2/g; heavy calcium carbonate having a specific surface area according to the BET method of 0.5 to 5 m2/g; a curing accelerating catalyst; and a silane-based curing agent, wherein the mixing weight ratio of the light calcium carbonate and the heavy calcium carbonate is 1:0.04 to 1:0.25, and the silane-based curing agent is a compound represented by the following formula: Gx-Si—R4-x, G is selected from the group consisting of alkoxy, acetoxy, oxime, and a hydroxy group, R is selected from the group consisting of a C1 to C10 alkenyl group, a C1 to C10 alkynyl group, and a C6 to C10 aryl group, and X is 2, 3, or 4.