Features Specifications:N-Acetyl-D-Glucosamine  N-Acetyl-D-Glucosamine Appearance: white or off white powder Assay (drying basis): 98%~102%  Specification Rotation: 39°- 43°  Chloride: ≤1%  PH value: 5.5 ~ 7.5 Loss on drying: ≤0.5%  Residue on Ignition : ≤0.1%  Bulk density: ≥0.30g/ml Mesh size: NLT 90% THRU 80 mesh Heavy metal: ≤10ppm Arsenic: ≤0.5ppm  Melting point: 196-205 Ironic salt: ≤10ppm  Lead: ≤5ppm  Cadmium: ≤2ppm