caustic potash 90% 1310-58-3 white flaks Manufacturer SGS caustic potash potassium hydroxide 1310-58-3 ItemStandardResultPotassium hydroxide (KOH),% ≥90.090.5Potassium carbonate (K2CO3),% ≤ 0.50.4Chloride (Cl),% ≤0.0050.004Iron (Fe),% ≤0.00050.0001Sulfate (SO4),% ≤0.0050.002Nitrate and Nitrite (N),% ≤0.0005<0.0005Sodium (Na),% ≤0.80.5Phosphate (PO4),% ≤0.005<0.001Portland (SiO3),% ≤0.010. ...