| abstract |
Organopolysiloxane composition (O) curable to vulcanizates having relative permittivity ε r of at least 6, measured by IEC 60250, and onset temperature greater than 80° C., including:n (A) 100 pbw of compounds having radicals with aliphatic carbon-carbon multiple bonds, (B) 0.1-50 pbw of organopolysiloxanes with Si-bonded hydrogen atoms or, instead of (A) and (B), (C) 100 pbw of organopolysiloxanes having SiC-bonded radicals with aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms, (D) 10-100 pbw of mineral reinforcing filler with BET surface area of at least 50 m 2 /g by DIN-EN-ISO 9277, (E) 4-300 pbw of carbon black with BET surface area of 5-1100 m 2 /g by ASTM D-6556 and with OAN of 10-500 ml/100 g by ASTM D-2414, and (F) thermally activatable catalyst containing compounds of the platinum metals selected from Pt, Pa, Rh and Ru, in such an amount that 0.0000001-0.01 pbw of platinum metal is present in the organopolysiloxane composition (O). |