16 OZ, Gray, Hi Temperature Stove & Furnace Cement, A Heavy Bodied Silicate Cement, Used To Repair Wood Or Coal Stoves, Furnaces, Fireplaces & Flues, Especially Suited For Bonding & Sealing Metal To Metal & Metal To Masonry Joints, Withstands Temperatures Up To 1,482 Degrees Celsius, 2,700 Degrees Fahrenheit.