| 摘要 |
PROBLEM TO BE SOLVED: To provide precipitated silica which has excellent workability and excellent dispersibility and is suitable as a reinforcing filler for silicone rubbers having remarkably improved dynamic fatigue characteristics. SOLUTION: This filler for reinforcing silicone rubbers comprises precipitated silica which has an oil absorption of <=200 cc/100 g, a BET method specific surface area of 120 to 200 m2/g, has a C value of 0 to 4 in the relational expression: V (the volume of titrated NaOH) ml=1.5/100×BET (m2/g)+C, between a Sears titration volume (V ml) and a BET specific surface area (m2/g), and has an A/B ratio of >=1.4 between a pore diameter peak position A(A) measured by an N2 method and a pore diameter peak position B(A) measured by a mercury method.
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