... We are a professional manufacture of 96% / 99% caustic soda(caustic soda flakes ,solid and pearl),sodium hydroxide and NaOH, ... Sodium Hydroxide Formula: NaOHExecutive Standard: GB209 --- 2006Caustic soda flakes 99%NaOH%>=99.0%NaCI%<=0.05%Na2CO3%<=0.8%Fe2O3%<=0.008 ... borax, chromium salts, manganese salts, phosphate, etc. need to use a lot of caustic sodaPackaging: Caustic soda flakes ----- 25kg / bag, ...