Caustic Soda 99%: NaOH: 99% min Na2CO3: 0.90% max NaCl : 0.15% max Fe2O3: 0.007% max Caustic Soda 96%: NaOH: 96% min Na2CO3: 1.4% max NaCl : 2.8% max Fe2O3: 0.01% max Molecular formula: NaOH Appreance: Peals/Flake/Solid Packing:25kg plastic bags(3layer pp/pe)Use: Mainly used in paper making, soap making, textiles, printing , dyeing, chemical fiber, pesticides, petro-chemical, medical and food industries. Our advantages: 1.We can provide the lowest price,because we are one of the main chemical suppliers in China!!! 2.For the highest quality,we have TDS,COA,MSDS,and so on !!! 3.For the best service,we promise to try every effort to meet all of your reasonable demand!!! 4.We believe that our products will be your ideal choice !!! Whether you have any question, please feel free to contact me at any time. 25kg/bag.