These unique high quality gaskets are made from a proprietary tacky glass cloth, synthetic fibres and brass wire mesh reinforcing, with a coating of P.T.F.E. material to MIL SPEC T-27730A. The gaskets are easily installed, and deliver trouble free service. When the time comes for routine maintenance, they are easily removed because of the P.T.F.E. coating. Blue-Max boiler gaskets are available in all sizes both manhole and handhole.