3M™ Fire Barrier Mortar, Lightweight, Pail Container, 5 gal Container, Water Base, Composition: Mineral Salt, Silicate Mineral, Acid, Quartz Silica, Calcium Carbonate, Powder Form, Fire Rating: 3 hr, Off-White with Dark Flecks, Slight Cement Odor/Scent, 180 deg F, 2.1 to 2.4 Specific Gravity, 10.2 to 11.9 pH