... : High purity (the content of NaOH can reach 99%), even particles, few impurity, good fluidity, easily to ... clean to prevent the dust and the residual solid caustic soda pearl from entering the equipments, thus to produce ... (diameter) 5. Quality index: Testing result: NaOH: 99.4%, Na2CO3:0.27%, NaCl:0.010%, Fe2O3:0 ... .002% Testing result of the Food Grade: NaOH: 99.1%, Na2CO3:0.56%, As :<0.0003%, Heavy ...