Application Mainly used in the manufacture of chromic oxide, potassium chromate, chromate yellow pigments, welding electrode, match, chromic potassium alum and chemical reagent. Also used in steel passivating and used as oxidizing agent. K2Cr2O7 99.7%min Chloride(CL) 0.05%max Insoluble 0.02%max Sulfate(SO4) 0.02%max Moisture 0.03% Sodium (Na+) 0.5% Packaging:In moisture-proof paper-plastic composite bags, net weight for each: 25kg.