Curable fluoropolyether base rubber compositions

摘要

A curable fluoropolyether base rubber composition contains (A) 100 parts by weight of a linear fluoropolyether compound having at least two alkenyl groups in a molecule and a perfluoroalkyl ether structure in its backbone, (B) 10-40 parts by weight of a silica filler having a specific surface area of at least 50 m2/g, (C) 5-35 parts by weight of diatomaceous earth, (D) an organosilicon compound having at least two Si-H groups, and (E) a hydrosilylation catalyst. The inclusion of diatomaceous earth is effective for preventing the composition from outgassing and from changing its curing behavior with time.