High purity, low heavy metal contents ; Hard to get cakings or lumps ; Quality fulfills GB209-2006 Industry grade standards COA Of Caustic Soda PearlsParameterSpecificationTypical Resultsl Content Of NaOH≥99%99%l Content Of Na2cO3≤ 0.4% 0.3%l Content Of NaCl≤ 0.02%0.01%l Content Of Fe2O3≤ 0.004%0.001%Appearance Of Caustic Soda Pearls Caustic soda Pearls / Prills 99% Min Industry Grade