10.3 OZ, Black, Cement & Mortar Cartridge, For Adhering Fiberglass Gaskets To Wood Stove Doors, Superior Adhesive Performance After Heat Cure, A Creamy Smooth Black Silicate Ceramic Type Cement, Formulated To Adhere Fiberglass Gasket To Steel & Cast Iron, Withstands Temperatures Up To 1,093 Degrees Centimeter, 2,000 Degrees Fahrenheit.