sila-seal professional grade 100% rtv silicone, case of 12 (clear), 1pc tube sila-seal sila-seal professional grade silicone sealants are non-slumping, one-part 100% silicone rubber acetoxy sealants that cure to a tough, rubbery solid upon exposure to moisture in the air (rtv-room temperature vulcanizing) with long-term flexibility and durability. all sila-seal professional grade silicone sealants are nsf 51 certified with the exception of red sila-seal and are safe for food contact once cured and cleansed thoroughly prior to first contact. it is primarily used as general purpose sealing and bonding agents, as space-filling rubber adhesives, or formed-in-place gaskets. sila-seal professional grade silicone sealants adhere to clean metal, glass, most types of non-oily woods, silicone resin, vulcanized silicone rubber, ceramic, natural and synthetic fiber, most painted and plastic surfaces. fully cured, the rtv silicone can be used for extended periods at temperatures up to 450°f and for shorter periods as high as 500°f. this product is ideal for many industrial applications where a long-term, permanently flexible bond or seal is required. not for use on aquariums. this product comes in a case of 12.