This specification covers a polytetrafluoroethylene (PTFE) resin filled with inorganic pigment in the form of molded rods or tubes which are sintered after molding. The blue colored material is designated for use in rod glands only and the yellow colored material is designated for use in piston glands only. The brown colored material is designated for use in AS 5857 rod glands only and the green colored material is designated for use in AS 5857 piston glands only.