White powder, melting point 622 ℃, soluble in water, calcium magnesium metal ions to significant chelating ability, to soften the hard, make suspending liquid into a solution, a weak alkali, no corrosion resistance, is a kind of inorganic surface active agent, oil and fat to have a strong emulsification, pile of density usually divided into low density 0.35-0.5 g/cm 3, medium density 0.51-0.65 g/cm 3, high density 0.66-0.9 g/cm 3; Sodium tripolyph-osphate have type I (high temperature type) and type II (low temperature type) two kinds of crystal morphology, both the same chemical properties, difference lies in the thermal stability and hygroscopic type I above type II, at the same time the solubility, dissolves in the hydration heat is different.
