"Ultragraph" pure graphite foil reinforced with synthetic carbon fibers which are twisted braided and rolled, is used to manufacture this perfectly square shaped special packing. This is one of the most advanced products for use in heavy duty, high temperature - high pressure pumps or valve applications. Style 1099 adjusts itself in the stuffing box and builds under pressure, a solid ring which handles extremely high peripheral speeds and resists abrasives and strong chemicals.