Properties CAS number: 13598-36-2 Molecular formula: H3PO3 Molecular weight: 82 Appearance: White Crystal Specifications: ITEMUNITSPECIFICATIONS Appearance/White crystal Purity%98.5 Min. Chloride%0.001 Max. Sulfate%0.006 Max. Phosphate%0.1 Max. Iron%0.0020 Max. Heavy Metals%0.001 Max. Uses: Raw material of the manufacture for phosphite and plastic stabilizers. Reducing agent in chemical reaction, And used synthetic fibre and agro-chemicals industry. Packages: In woven bags of 25kg net each. UN: 2834 Class: 8 PG: IIIWater Treatment manufacturers website:http://www.foremost-chem.com/water-treatment/