Key exporter in China. Purity:99.6% min. Approved by multinational users. Appearance white crystal or Crystalline powderPurity, % 99.6 MinLoss on drying, % 0.3 MaxResidue on ignition, % 0.01 MaxHeavy metal (Pb), ug/g 10 MaxFe, ug/g , 5 MaxCu, ug/g 1 MaxMn, ug/g 1 MaxAs, ug/g 4 MaxSulfate, ug/g 50 MaxChloride, ug/g 10 MaxMelting point, °C 165~168Color, APHA 5 MaxClarity (5%watersolution) ...