Russian Sodium DichromateI Anhydrous CristallineNa2Cr2O7.Main substance (Na2Cr2O3), min98.8%Main substance in coversion to CrO3, min75.5% Sulphates in conversion to SO4, max0.1%Chlorides in conversion to Cl, max0.2%Water insoluble residue, max0.01%Main substance (Fe), max0.001% pH of water, min3.5