Potassium Bromide Molecular Formula: KBr CAS No.:7758-02--3 Appearance: White Crystal / Powder 1) Photo Grade Main Content: 99.50%min Loss on Drying: 0.50%max Chloride: 0.20%max Sulfate: 0.005%max Bromate: 0.003%max PH(5%): 5.5-8.5 Cu: 0.50ppmmax Fe: 0.50ppmmax Pb: 0.02ppmmax Transparency: Qualified Packaging:25kgs PP/ PE bags 2) Medical Grade Main Content: 99.00%min Loss on Drying: 1.00%max Chloride: 0.50%max Sulfate: 0.02%max Bromate: Non-reaction PH(5%): 5.5-8.5 Pb: 10ppmmax Packaging:25kgs PP/ PE bags Uses: It is mainly used as sensitization film,photograph sensitive material and photographic paper,and medicine,printing agents,etc.