Disodium hydrogen phosphate dihydrate

Disodium hydrogen phosphate dihydrate (CAS 10028-24-7) is an inorganic sodium salt commonly known as dibasic sodium phosphate or disodium phosphate. It carries no E-number designation and is identified under EC 600-053-5. The compound is traded under several names including DSP and disodium phosphate dihydrate.

In pharmaceutical manufacturing, it serves as a buffering agent in parenteral formulations, maintaining solution pH within a defined range by balancing hydrogen and phosphate ion concentrations. In food processing, it functions as an emulsifying salt in processed cheese, where it displaces calcium from casein proteins to improve melt and texture. Water treatment applications rely on its sequestration capacity to bind scale-forming calcium and magnesium ions.

Disodium hydrogen phosphate dihydrate is available in food-grade, pharmaceutical-grade, and technical-grade specifications, with compliance to Ph.Eur., FCC, and USP monographs depending on grade. It falls under REACH registration requirements for EU supply. Packaging is typically offered in 25 kg bags or bulk quantities under HS code 28352200.