Disodium dihydrogen pyrophosphate

Disodium dihydrogen pyrophosphate (DSPP, CAS 7758-16-9) is an inorganic phosphate salt commercially available under trade names SAPP 28 and SAPP 40, where the numbers indicate reactivity rates. It carries the EC number 231-835-0 and is registered under REACH. It does not hold an E-number designation in the EU.

In food processing, DSPP acts as a leavening acid in baking powders, reacting with sodium bicarbonate at controlled rates to generate CO2 during dough mixing or oven rise. In water treatment, it sequesters calcium and magnesium ions through chelation, inhibiting scale formation in distribution systems and industrial pipelines.

DSPP is sourced in food-grade and technical-grade forms, with food applications typically requiring FCC or equivalent compliance. It is subject to REACH registration for industrial supply within the EU. Standard packaging formats include 25 kg bags, with bulk options available depending on supplier.