Rubber gasket for an expansion gasket, part of the piping sealed parts. This gasket is by outer ring, and middle expansion ring and the within layer ring three part constitute of; outer ring and within layer ring for General of elastic sealed ring, Middle expansion ring of Center has a ring bubble structure, on both sides for hollow ring, ring outside side sealed, ring inside opening; outer ring and within layer ring are is divided into two part, loaded in Middle expansion ring ring bubble structure of both inside and outside side.
Rubber gaskets with oil, acid and alkali, cold, heat and ageing resistance properties, is widely used in the automotive, electronic, chemical, antistatic, flame-retardant, food and other industries.
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