According to the structure and shape, it is divided into white powder anhydrate (Na5P3O10) and right-angled parallelepiped crystal hexahydrate (Na5P3O10·6H2O) anhydrate with type I and type II, and industrial sodium tripolyphosphate is actually I. Type I and type II mixture, type I dissolves quickly, has a large thermal effect when hydrated to form hexahydrate, and is easy to absorb moisture and agglomerate in the atmosphere. Type II absorbs moisture slowly and is not easy to agglomerate. Therefore, detergent is trimeric. The content of type I in sodium phosphate should not be too high, generally controlled at 10 to 30%.
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