... Manufacturer SGS potassium hydroxide 90% ItemStandardResultPotassium hydroxide (KOH),% ≥90.090.5Potassium carbonate (K2CO3),% ≤ 0.50.4Chloride (Cl),% ≤0.0050.004Iron (Fe),% ≤0.00050.0001Sulfate ... (N),% ≤0.0005<0.0005Sodium (Na),% ≤0.80.5Phosphate (PO4),% ≤0.005<0.001Portland (SiO3),% ≤0.010.001Aluminum(Al),% ≤,0.002<0.0003Calcium(Ca),% ≤0.0050.0001Nickel(Ni),% ≤0.00050 ...