Profile: Blackhawk Rubber & Gasket, Inc. manufactures various gaskets such as custom gaskets, automotive transmission gaskets, flange, spiral wound, extruded rubber and molded rubber gaskets, seals, o-rings & mats. Our gasket materials include fiber, paper, CNA, foam, fibers, papers and cork rubber. We also offer materials with pressure sensitive adhesive and double backed tape. Our o-rings are made from nitrile buna-N.