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First grade | middlings | ||
Cr2O3 content/% | ≥ | 99.2 | 97 |
tinting strength % | ≥ | 95 | -- |
covering power % | ≤ | 15 | -- |
Screenings % | |||
Using 300 mesh | 0.5 | -- | |
Using 200 mesh | -- | 0.5 | |
Oil Absorption | 25 | -- | |
Water soluble salt | ≤ | 0.3 | 0.5 |
moisture | ≤ | 0.3 | 0.5 |
Coloured light | 0.3 | 0.5 |
Chrome Oxide Green