Ideal for the installation and service of furnaces and oil burners, Creates a smoke and air-tight seal, Can withstand temperatures up to 2,000º F, Effectively bonds 1/8"" wide metal-to-metal and metal-to-masonry joints, Pre-mixed for convenient application, Suitable for use on cast iron, steel, and firebrick, Entirely free of toxic fumes, Fits in a standard caulking gun, Solvent: water, Cement Type: silicate, Consistency: smooth paste, Dry Time: 1 hour, Heat Cure Temperature: 500º F, Coverage: approximately 99 linear feet with a 1/8"" bead, Color: Black, Shelf Life: about 18 months from date of shipment, SKU: RTLD127