Description: White crystals or white crystalline power Specifications: 1)Content:99.5% min 2)Specific roration, [a] 20D:-11.8 - -12.8 3) Heavy metal (Pb):0.001% max 4) Loss on drying:0.2% max 5) Sulphate (SO4):0.2% max 6)Melting point:164-170 7)Arsenic (As):2ppm max Key Specifications Description: White crystals or white crystalline power Specifications: 1)Content:99.5% min 2)Specific roration, [a] 20D:-11.8 - -12.8 3) Heavy metal (Pb):0.001% max 4) ...