Sodium dihydrogen phosphate dihydrate

Sodium dihydrogen phosphate dihydrate (CAS 13472-35-0) is an inorganic sodium salt also known as sodium biphosphate, monosodium orthophosphate, and sodium biphosphate dihydrate. It carries no E-number designation and is classified under HS code 28352200 within the salts and minerals category.

In pharmaceutical manufacturing, it functions as a buffer by releasing or accepting protons to maintain precise pH ranges in injectable formulations and oral solutions. Water treatment facilities apply it as a sequestrant, where its phosphate anion binds calcium and magnesium ions to prevent scale formation in distribution systems. It also acts as a chelator in food processing to control metal-catalysed oxidation.

Sodium dihydrogen phosphate dihydrate is available in food-grade and pharmaceutical-grade specifications, meeting FCC and Ph.Eur. standards where applicable. It is subject to REACH registration requirements for industrial supply within the EU. Standard packaging formats include 25 kg bags and bulk quantities for industrial procurement.