Meets ASTM G-31 Non-corrosive! Does not contain muriatic, hydrochloric, hyrdoflouric, sulfuric, or phosphoric acids. The active ingredient occurs naturally in sugar cane syrup. Back-Set may be used to remove cured cement, concrete, mortar, grout and stucco off virtually any surface without harm. Equipment type: Ready-Mix Trucks, mixers, vehicles, forms, molds, buggies, ship-holds, tankers, pumps, trowels, screeds, vibrators, concrete saws, slip form pavers, augers, etc.