Classification code GBl5.003, INS451.Chemical structure: this product is a kind of amorphous water-soluble linear polyphosphate, terminated with Na2 PO4 at both ends, chemical formula Na5P3 O10, relative molecular weight 367.86.Commonly used in food as a water retention agent, quality improver, pH regulator, metal chelating agent.And used as assistant agent of synthetic detergent, synergistic agent of soap and preventing soap grease from separating out and frosting.