<p>Heat curing, Dense putty with heavy fiber concentration, Brown color. Good travel in high temp applications. Use with 411 or 440-T to help travel and get into threads or tight gaps. Shelf-life is 6 months in closed containers. Refrigerated storage recommended. </p><h2>Applications</h2><p>Flanges, Enclosures, Clamps, Hot hydrocarbons, Super heated steam, Extreme hot air, Benzene, Chemicals.</p>