Sodium Tripolyphosphate (STPP) is white powder, melting point 622 'c, soluble in water, such as calcium and magnesium metalion chelating abilysignificantly, can soften hard water, make suspension solution, have a weak alkali, no corrosion, is a kind olinorganic surface active agent, have a strong emulsification of lubricating oil and fat, low bulk density is usualydivided into 0.35 0.5 g/cm3 density, medium density 0.51 0.65 g/cm3, 0.66 0.9 g/cm3 density; Five sodium with type(high temperature type) and type ll (low temperature type) two kinds of crystal morphology, its chemical propertiesare the same, the diference is that the thermal stability and moisture absorption type l higher than that oftypel, bothat the same time, the solubility of dissolving hydration heat is different. Hydrolysis in water gradually generaleorthophosphate, has the good ability of chelating metal ion, it can with metal ions such as calcium, magnesium, ironcomplexation, has the nature of certain organic surface active agent.

To be used in canned food industry, fruit drinks, milk, soybean milk and other quality improver, mainly for the cannedham meat tenderizer, canned beans to soften bean skin, can also be used as softener and thickener.