Items
Photo grade
Medical grade
Industrial grade
Appearance
White crystal
Main content ≥
99.5%
99.0%
98.5%
Loss on drying ≤
0.5%
1.0%
Chloride
≤ 0.3%
≤ 0.5%
≤ 1.5%
Bromate ≤
0. 003%
Non-reaction
Iodide ≤
0.005%
Qualified
Sulphate ≤
0.01%
0.02%
0.1%
PH ( 5% )
5.5-8.5
5.5-9.5
Arsenic ≤
0.2PPM
4PPM
/
Pb ≤
10PPM
Fe ≤
0.5PPM
Cu ≤
Transparency