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As NA2O / P2O5 ratio glassy phosphate molecules near 1. Formerly known as "Graham" Salt. In 1832 it discovered by Graham. He sodium dihydrogen phosphate salts heating dehydration, in which heating melting point (625 ℃) under, and rapidly cooling the molten material, prepared by Graham hygroscopic salts [1]. Chinese name hexametaphosphate, sodium hexametaphosphate English name Sodium Hexametaphosphate (Sodium Polyphosphates, Glassy; Sodium Tetrapolyphosphate; Graham's Salt) alias sodium vitreous, Graham salt SHMP English shorthand formula (NaPO3) 6 (Mr≈611.77 ) CAS No.10124-56-8 appearance of transparent glass flake or white powder