| abstract |
In a curable fluoropolyether base rubber compositionncomprising a linear fluoropolyether compound having at leastntwo alkenyl groups, an organosilicon compound having at leastntwo SiH groups, and a hydrosilylation catalyst, surface-hydrophobicizednmicroparticulate silica having a specificnsurface area of at least 50 m 2 /g and a nitrogen atom contentnof 500-5,000 ppm is blended. A cured product thereof isnsignificantly improved in compression set. The compositionncan be used in a wider variety of molding applicationsnincluding O-rings. |