Abstract: An electrolytic cell for electrolysis of an aqueous sodium chloride solution is provided with a closure for its open side which is resistant to degradation by chlorine and ozone. The cover has an external elastomeric layer which is stable when exposed to ozone and a polytetrafluoroethylene layer facing the aqueous solution which resists attack by chlorine, and intermediate polyamide, polyester or fiberglass mesh on synthetic rubber layers. The synthetic rubber layer is chloroprene vulcanized with lead oxide.

Abstract: A toothed belt adapted to be used while wet with a mineral oil has a ring of elastomeric material for a body, a tension resistant member inserted in the body, teeth on at least one side of the body, a rigid covering which is substantially non-deformable under flexion stresses for the teeth and intermediate groove surfaces made by doubling a rubberized fabric over an elastomeric layer as described in U.S. Pat. No. 3,937,094. The body, the teeth and rubberized fabric are all made from an oil resistant elastomer such as an epichlorohydrin rubber composition.