... rate Grade0.01Sulfate (SO42-) %≤Excellent Grade0.002First-rate Grade0.005Nitrate Nitrite (N) %≤Excellent Grade0.0005First-rate Grade0.0005Phosphate (PO4) %≤Excellent ... and organic intermediates, regeneration of old rubbers, the production of sodium metal, inorganic salt , chromate, manganese, borax acid salt, ... heat, combustible and acids. Potassium Hydroxide 90% flake w/high quality,low price