DL-Malic Acid, FCCIV,spec: Assay(as C4H6O5): 99.0%~100.5% Specific Rotation: -0.10~ +0.10 Heavy Metals (as Pb): 10mg/kg Max Residue on Ignition: 0.1%Max Fumaric Acid: 1.0%Max Maleic Acid: 0.05%Max Water-insoluble Matter: 0.1%Max Arsenic (as As2O3): 4mg/kg Max Packing: in 25 kgs bags. HENAN KINGWAY CHEMICALS CO.,LTD.