Abstract: Silicone compositions which, when exposed to atmospheric moisture at room temperature cure to form a flame retardant elastomer comprising (a) an organopolysiloxane having terminal hydroxyl groups, (b) a cross-linking agent having an average of at least three functional groups linked to a silicon atom per molecule, in which the functional groups are selected from the group consisting of hydrocarbonoxy groups, amine groups, aminoxy groups, oxime groups and mixtures thereof, (c) a condensation catalyst, (d) platinum metal or compound thereof, (e) carbon black, (f) alumina hydrate and optionally (g) a filler.The resultant flame retardant silicon elastomers are useful as insulation for electrical equipment, as encapsulants and as sealants where flame retardancy is necessary.

Abstract: Novel mercaptoorganosiloxane compounds of the formula ##STR1## wherein n has a value of from 1 to 3 inclusive, are useful as components of primer compositions for enchancing the adhesion of silicone elastomers to substrates.

Abstract: Reinforcing silica treated with short chain linear amidosiloxane of the formula ##STR1## provides a useful reinforcing filler for silicone elastomers. Silicone elastomer bases manufactured using this treated silica can be cured by organic peroxides or the combination of organohydrogensiloxane and platinum catalyst. When the later curing system is used, the cured products exhibit considerable retention of physical properties upon exposure to elevated temperatures for a significant period of time.

Abstract: Short chain linear amidosiloxanes of the formula ##STR1## where R is a methyl, ethyl, or phenyl radical, R' is a methyl, ethyl, or 2-(perfluoroalkyl)ethyl radical, R" is a methyl or vinyl radical, and R''' is a methyl or ethyl radical and x is an integer of from 3 to 20 and mixtures of these amidosiloxanes are useful as treating agents for reinforcing silica fillers.

Abstract: The method of mixing a hydroxyl endblocked polydiorganosiloxane and a silane of the formula ##STR1## where R is alkyl of one to four carbon atoms or phenyl and allowing the mixture to react at room temperature provides a polydiorganosiloxane of increased molecular weight in a short time, such as a few minutes to several hours. The resulting polydiorganosiloxane product contains methylvinylsiloxane units which are functional and can be further reacted with silicon-bonded hydrogen atoms or organic peroxides to give new polymers or cured products such as rubbers.