Industrial Grade Silicone Sealants are a paste-like, one component material which cures to a tough, rubbery solid upon exposure to moisture in the air. Because it does not flow due to its own weight, these sealants can be applied overhead or on sidewall joints and surfaces without sagging, slumping or running off. They may be applied in sub-zero weather without loss of extrusion or physical property characteristics. Fully cured they can be used for extended periods at temperatures up to 450°F, and for shorter periods as high as 500°F. Tests have shown that even after two months at 450°F (or up to one week at 500°F) the sealant remains rubbery.