NuFlex¨Ê302 High Temperature (HT) Silicone Sealant is a 100% RTV, NSF Approved acetoxy sealant designed for extreme temperature applications. It has the ability to withstand temperatures as high as 316¡C (600¡F)and adheres to many substrates, including metal, glass, most types of wood, ceramics, and many plastics. Available in Black or Red. Fits all standard 10 oz caulk guns.