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CharacteristicsIndex
Â
High-class
First-class
Qualified
Â
Sulphur content (S)
% ≥
99.95
99.50
99.00
Â
Moisture content
% ≤
0.10
0.50
1.00
Â
Ash content
% ≤
0.03
0.10
0.20
Â
Acidity content (H2SO4)
% ≤
0.003
0.005
0.02
Â
Organic matter
% ≤
0.03
0.30
0.80
Â
Arsenic (As)
% ≤
0.0001
0.01
0.05
Â
Ferrum content (Fe)
% ≤
0.003
0.005
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Â