A METHOD OF MANUFACTURING STUFFING BOX PACKING RINGS AND A STUFFING BOX PACKING COMPRISING PACKING RINGS SO PRODUCED

摘要

A packing material for stuffing-boxes comprises a sintered blend of PTFE resin and at least one filler material. Rings of the improved packing material can be used as retaining rings in a gland to substantially prevent squeezing of a more pliable and soft packing material from the gland under pressure in use. A method of manufacturing a packing material comprises extruding a blend of PTFE resin and least one filler material into coiled form and sintering said extruded coil.