<p>Heat curing, Dense paste impregnated with metal and ceramic fibers, Black color. Shelf-life is 6 months in closed packages. Must store in refrigerator or freezer. </p><h2>Applications</h2><p>Clamps, Enclosures, Perimeter Seals, Wire Wraps, Flanges, Boiler Feed Water, Steam, Bad Blows, Condensate. Designed for bridging large gaps or voids. Can be used for killing or plugging valves or lines no longer in use. </p>