Patent ID: 7250467

Claim:
A condensation-curable organopolysiloxane composition consisting essentially of: (A) 100 parts by weight of an organopolysiloxane having a viscosity from 100 to 500,000 mPa·s at 25° C. and having in one molecule 1.5 or more end groups represented by the following general formula: (X) a R 1 3−a Si—, wherein each X is independently selected from the group consisting of a hydroxyl group and a hydrolyzable group, each R 1 is independently selected from the group consisting of a monovalent hydrocarbon group and a halogen-substituted monovalent hydrocarbon group, and a is 1, 2, or 3; (B) 0.01 to 40 parts by weight of a cross-linking agent selected from a group consisting of a silane or a siloxane oligomer, wherein the cross-linking agent has three or more silicon-bonded hydrolyzable groups per molecule; (C1) a flame retardant comprising a platinum compound present in an amount such that metallic platinum is present in an amount of 1 to 2,000 ppm based on the weight of the composition; (C2) an organosiloxane oligomer, where the organosiloxane oligomer contains aryl and alkenyl groups, the organosiloxane oligomer has 8 or less silicon atoms per molecule, and the organosiloxane oligomer contains in each molecule at least one divalent organosiloxane group represented by the formula —(R 2 )(R 3 )SiO—(R 2 )(R 3 )Si— wherein R 2 is an aryl group, and R 3 is an alkenyl group; wherein the organosiloxane oligomer is present in a quantity such that the composition contains at least 2 moles of component (C2) per 1 mole of platinum atoms in component (C1); and (D) 5 to 300 parts by weight of an inorganic powder.