Abstract: A process for insulating high voltage conducting media by insulating such media with a silicone rubber composition capable of being converted to a rubbery elastomer superior in high voltage electrical insulating characteristics is provided. The composition comprises the following components (a) to (e) and not containing a platinum catalayst:(a) 100 parts by weight of an organopolysiloxane gum;(b) 10-100 parts by weight of a finely divided silica filler;(c) 15-300 parts by weight of aluminum hydroxide;(d) 1-20 parts by weight of a OH terminated organosilane or organosiloxane oligomer; and(e) 0.05-6 parts by weight of an organic peroxide.

Abstract: This invention deals with siloxane compositions which can be readily converted to elastomers or resins at normal curing temperatures but will ceramify upon firing to higher temperatures to give flexible ceramics having electrical insulating properties and excellent physical properties.

Abstract: What is disclosed is a composition of matter which is a siloxane copolymer, a siloxane polymer, a ceramic forming filler and a peroxide which upon heating to 500.degree. C. or greater forms a pliable, flexible ceramic material which is useful as insulative coatings on various electrical conductive substances such as electric wires and cables.