Sealing member

Abstract

Provided is a sealing member that can suppress occurrence of cracks and the like during demolding in a die molding process and that has excellent resistance to copper contamination. The sealing member includes a crosslinked product of a rubber composition containing components (A) to (E), wherein the ethylene content of component (A) is 50 mass % or more, and the content of component (B) is 30 to 90 parts by mass, the content of component (D) is 0.5 to 10 parts by mass, and the content of component (E) is 3 to 10 parts by mass, with respect to 100 parts by mass of component (A). (A) At least one of an ethylene-propylene-diene rubber and an ethylene-butene-diene rubber (B) Silica (C) Organic peroxide (D) Benzimidazole-based antioxidant (E) Zinc oxide

Dependencies are inferred from the claim text.