Food grade (FCC4) Appearance White crystal powder Assay 99.5~100.5 Melt Point 234~300 Arsenic( As ) mg/kg not more than 3 percent Heavy Metal (Pb) not more than 10 percent Maleic Acid not more than 0.10 percent Residue on Ignition not more than 0.10 percent Moisture not more than 0.6 percent