Superior Grade Product First-class Product Qualifid Product Sodium hydroxide(NaOH)% ≥96.0 ≥95.0 Sodium carbonate(Na2CO3) 1.2 1.3 1.6 Sodium Chloride(NaCl)≤ 2.5 2.7 3.0 Ferric oxide(Fe2CO3) 0.008 0.01 0.02 Sodium hydroxide(NaOH)% ≥99.0 ≥98.5