| 摘要 |
Mechanically/thermally improved, filler reinforced organosilicic elastomers, e.g., organopolysiloxanes, are comprised of a reinforcing amount of precipitated silica particulates having the properties: -(i) BET surface area 190 to 340 m2/g -(ii) CTAB surface area 180 to 280 m2/g - -(iii) <IMAGE> 0.9 to 1.2 - -(iv) Residual sodium content <500 ppm -(v) pH 3.5 to 6.0 -(vi) Specific volume Vo >4.2 -(vii) Amount of particles of <0.05% - a size as will not pass - through a 45 mu mesh sieve - |
