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Class 1 Class 2 Class 3
Test items Superior grade A first-rate product Acceptable product A first-rate product Acceptable product
Sodium Sulphide (Na2S) % ≥ 60 60 60 60 60 65
Sodium sulfite (Na2SO3) % ≤ 2 - - - - -
Thiosulfuric acid (Na2S2O3)% ≤ 2 - - - - -
Iron (Fe) % ≤ 0.03 0.12 0.2 0.003 0.005 0.08
Sodium carbonate (Na2CO3) % ≤ 3.5 5 - 2 3 4
Water insoluble matter % ≤ 0.2 0.4 0.8 0.05 0.1 0.3
Industrial sodium sulfide into three categories: one for ordinary sodium sulfide (commonly known as red alkali); Class 2 low iron sodium sulfide (commonly known as the yellow base); three types of high levels of sodium sulfide.