Molecular Formula: H3PO3 Molecular Weight: 82.0 Density: 1.651(21.2 ) Melting Point: 73.6 Boiling Point: 200 Specificatons: Testing Item Standard 99% Stand 98.5% Content(%) 99.0 Min 98.5 Min. Iron(%) 0.001 Max 0.005 Max Chloride(Cl)(%) 0.001 Max 0.01 Max Sulfate(SO4)(%) 0.008 Max 0.008 Max. Phosphate(PO4)(%) 0.2 Max 0.2 Max. Appearance White Crystals White Crystals CAS No.: 13598-36-2 EINECS: 237-066-7 UN No.: 2834 Hazard Class: 8 Packing Group: III Packages: 25kg, 500kgs, 1000kgs plastic bag lined with PE.