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Items | Photo First Grade | Photo Second Grade | Medical Grade |
---|---|---|---|
Main content | 99.5% min | 99.5% min | 99.0% min |
Loss on drying | 0.3% max | 0.3% max | 0.5% max |
Chloride | 0.2% max | 0.2% max | 0.5% max |
Bromate | 0.001% max | 0.003% max | 0.005% max |
Iodide | 0.001%max | 0.005% max | 0.005% max |
Sulphate | 0.005%max | 0.005% max | 0.01% max |
PH Value (5.) | 6.0-7.5 | 5.5-7.5 | 5.5-7.5 |
As | - | - | ≤0.0004. |
Pb | 0.2ppm max | 4ppm max | 10ppm max |
Fe | 0.5ppm max | 4ppm max | 5ppm max |
Cu | 0.5ppm max | 1.0ppm max | 1ppm max |
Bi | 0.2ppm max | 0.5ppm max | - |
Peroxide solution penetrability (250g/l) | 93.100 (410nm) | 85.100(410nm) | |
Transparency test | Qualified | Qualified | - |
Ammonia | 15.0ppm max | - | - |
Peroxide solution chromaticity (250g/l) | (15.0 Black once) max | - | - |