Formula (NaPO3)6, MW 611.77, CAS 10124-56-8. White powder, specific gravity 2.484, easily soluble in water, insoluble in organic solvents; strongly hygroscopic and able to form soluble chelates with Ca, Ba, Mg, Cu and Fe ions, an excellent water-treatment agent. In food industry used as quality improver, pH regulator, metal-ion chelating agent, binder and swelling agent. Packed in 25/50/1000 kg plastic-lined woven bags.