Appearance White or nearly white crystalline powder or granules
Assay 99%min
Melting point 127-132℃
Fumaric acid 1.0% max
Maleic acid 0.05% max
Water insolubles 0.1% max
Sulphated ash 0.1% max
Heay metals 10ppm max
Lead 2ppm max
Arsenic 2ppm max
Mercury 1ppm max
Specific rotation -0.1°~+0.1°