Patent ID: 6232387
Filing Date: 2001-05-15
Classification: C08G,C08K,C08L

Abstract:
A silicone rubber composition for use as a high-voltage electrical insulator, comprising(A) 100 parts by weight of an organopolysiloxane of the following average compositional formula (1):R.sup.1.sub.n SiO.sub.(4-n)/2 (1)wherein R.sup.1, which may be the same or different, is a substituted or unsubstituted monovalent hydrocarbon group and n is a positive number of 1.98 to 2.02,(B) 1 to 100 parts by weight of finely divided silica,(C) 50 to 300 parts by weight of a mixture of at least a first aluminum hydroxide surface treated with a silicon-containing compound and having a mean particle size of 5 to 20 .mu.m and a second aluminum hydroxide surface treated with a silicon-containing compound and having a mean particle size of 0.1 to 2.5 .mu.m, and(D) 0.01 to 10 parts by weight of an organic peroxide.