STPP, Sodium Tripolyphosphate Used as main auxiliary of synthetic wash, soap ... easily soluble in water, with remarkable chelating ability to some metal ions such as Ca2+, Mg2+, can soften hard water, ... petroleum product, gum latex storage, as dispersant, solvent in metal industry and pharmaceutical industry, also widely used in gum synthesis ... , do not pile up in the open air. Sodium Tripolyphosphate