Silicone rubber compositions for high-voltage electrical insulat

Details Silicone rubber compositions for high-voltage electrical insulat Silicone rubber compositions for high-voltage electrical insulat

1998-02-02

2000-05-16

Nakarani, D. S.

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428328, 428331, 428447, 428451, 524437, 524493, 524588, 524789, 524860, 524861, 524862, 524865, B32B 2520, B32B 1800, C08L 8307

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060634871

ABSTRACT:
A silicone rubber composition comprising (A) 100 parts by weight of an organopolysiloxane composition of the organic peroxide or addition curing type, (B) 1-100 parts by weight of finely divided silica, and (C) 30-500 parts by weight of aluminum hydroxide is suitable for use as a high-voltage electrical insulator. The aluminum hydroxide (C) has a water-soluble sodium ion content of up to 0.01% by weight and exhibits pH 6.5-8.0 and an electrical conductivity of up to 50 .mu.s/cm when measured as a 30 wt % water slurry and preferably has been treated to be hydrophobic. The composition cures into a silicone rubber having improved high-voltage electrical insulating properties even under rigorous conditions.

REFERENCES:
patent: 5519080 (1996-05-01), Matsushita et al.
patent: 5863969 (1999-01-01), Ward et al.

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