... Phosphoric Acid. Phosphoric Acid Tech Grade & Food Grade Molecular Formula:H3PO4 CAS: 7664 38 2 Usage: as food acidulant yeast untrient Phosphoric Acid ... superphosphates, other phosphate salts, polyphosphates, detergents. Acid catalyst in making ethylene, purifying hydrogen peroxide. ... and flavor, synergistic antioxidant and sequestrant in food. In dental cements; rustproofing of metals before ...