... chemical materials, and the high purity caustic soda flake is the upgrade product of the solid caustic soda .Testing result:NaOH: 99.4%, Na2CO3 ... and other impurity, we take the 50% ionic membrane liquid caustic soda as material, every part of the workshop should keep clean ... to prevent the dust and the residual solid caustic soda from entering the equipments, thus to produce the grainy ...