... High purity (the content of NaOH can reach 99%), even particles, few impurity, good fluidity, easily to be matched in use with ... the equipments, thus to produce the grainy caustic soda pearl with high quality, even particles, stable quality without powder. 4. Specification: The thick ... thin grain: 1.0-1.6mm (diameter) 5. Quality index: Testing result: NaOH: 99.4%, Na2CO3:0.27%, NaCl:0.010%, Fe2O3 ...