FLUORORUBBER COMPOSITIONS AND CROSSLINKED FLUORORUBBER

摘要

Object: To provide fluororubber compositions and crosslinked fluororubber products that are suitable for use as rotary shaft seals, in which each of the initial characteristics, i.e., torque reduction (reduced friction) and sealing properties attributed to reduced oil leakage (oil pump rate when the seal member slides), can be improved, and degradation of these characteristics can be inhibited even after frictional abrasion. Solution Means: A fluororubber composition obtained by blending a polyol crosslinking agent into a fluororubber polymer comprising 70 to 90 wt% of a polyol-crosslinkable fluororubber polymer (A) and 30 to 10 wt% of a peroxide-crosslinlcable fluororubber polymer (B); and a fluororubber composition obtained by blending a polyol crosslinking agent and a peroxide crosslinking agent into a fluororubber polymer comprising 40 to 90 wt% of a polyol-crosslinkable fluororubber polymer (A) and 60 to 10 wt% of a peroxide-crosslinkable fluororubber polymer (B).