... , we take the 50% ionic membrane liquid caustic soda pearl as material, every part of the workshop ... to prevent the dust and the residual solid caustic soda pearl from entering the equipments, thus to produce ... the grainy caustic soda pearl with high quality, even particles, stable ... 1.0-1.6mm (diameter) esting result: NaOH: 99.4%, Na2CO3:0.27%, NaCl:0.010%, Fe2O3:0 ...