This standard covers disodium phosphate, anhydrous, for water supply service. The product described is an orthophosphate used, as formulated and in blends, to inhibit corrosion of potable water conveyance systems. The product described by this standard is also known as sodium phosphate, dibasic, anhydrous. The main purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for disodium phosphate, including physical, chemical, packaging, shipping, and testing requirements.