Sealing composition and seals made by using the same

摘要

The invention relates to a sealing composition which comprises a crosslinkable fluoroelastomer, a crosslinking agent for this elastomer and a reinforcing polyimide resin powder; and seals such as O-rings, made by molding the composition into a prescribed shape and crosslinking the molded article. According to the invention, seals free from metals and sulfur can be made from a fluoroelastomer suitable for the production unit for semiconductor devices without a scatter of physical properties within one seal or among seals, and the obtained seals are lowered in the compression set determined ate the same hardness level to cause little permanent set by compression in use, thus having a prolonged service life.