| 摘要 |
<p>A composition, heat curable to an elastomer comprises (i) 100 parts by weight of an organopolysiloxane in which the organic substituents are essentially all methyl, phenyl or trifluoropropyl radicals but which may also contain up to 5 mol. per cent of H atoms, OH groups or vinyl radicals and having a degree of polymerization of at least 100, (ii) 2 to 35 parts by weight of fibrous chrysotile asbestos filler, (iii) 1 to 100% by weight of the asbestos of a compound R1mSi(OR)4- m or a partial hydrolysates thereof where R1 is a hydrocarbon radical containing not more than 12 carbon atoms, R is a C1 to C6 alkyl or alkoxyalkyl radical and m = 0 or 1 (e.g. ethyl polysilicate) and (iv) a catalytic amount of a curing catalyst (e.g. an organic peroxide).</p> |
