Dynatex® Black Industrial Grade Silicone Sealant is a paste-like, one component material which cures to a tough, rubbery solid upon exposure to moisture in the air. It may be applied in sub-zero weather without loss of extrusion or physical property characteristics. Fully cured, it can be used for extended periods at temperatures up to 4500 F (2320 C), and for shorter periods as high as 5000 F (2600 C). Test have shown that even after two months at 4500 F (2320 C), or up to one week at 5000 F (2600 C), the sealant remains rubbery.