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SAPP Appearance White Powder Disodium Dihydrogen Pyrophosphate %(w/w) min. 95.0 Water Insoluble %(w/w) max. 1.0 Arsenic (As) mg/kg max. 3 Heavy Metal (as Pb) mg/kg max. 15 Fluoride (as F)mg/kg max. 50 pH (1% aqueous solution) 4.0+0.5