... of 96% / 99% caustic soda(caustic soda flakes ,solid and pearl),sodium hydroxide and NaOH, and we can supply you high ... %<=0.08%Na2CO3%<=1.0%Fe2O3%<=0.01% Caustic soda pearl 99%NaOH%>=99.0%NaCI%<=0.05%Na2CO3%<=0.8 ... %Na2SO4%<=0.03%Main uses: the manufacture of chemicals, paper, aluminum smelting, refining tungsten, artificial silk, rayon and soap manufacturing, production ...