<p>Non-curing, Putty-like compound, Designed for rotating shaft packing glands, Pump 99 (black) contains PTFE and lead shot. Pump 77 (white) contains PTFE and stainless steel fibers and is non-staining. Shelf-life is 2 years in closed containers.</p><h2>Applications</h2><p>Rotary pumps, Valves, Centrifugal pumps, Agitators, Reciprocating pumps, Mixers, Turbine pumps, Refiners, Dryers</p>