grade | capacity (g/L) | Unsound Kernel (%) | Impurity (%) | Moisture (%) | color and odor | |
total | of which: minerals | |||||
first grade | ≥790 | ≤6 | ≤1 | ≤0.5 | ≤12.5 | normal |
second grade | ≥770 | ≤6 | ≤1 | ≤0.5 | ≤12.5 | normal |
third grade | ≥750 | ≤8 | ≤1 | ≤0.5 | ≤12.5 | normal |
fourth grade | ≥730 | ≤8 | ≤1 | ≤0.5 | ≤12.5 | normal |
fifth grade | ≥710 | ≤10 | ≤1 | ≤0.5 | ≤12.5 | normal |
substandard | <710 | - | ≤1 | ≤0.5 | ≤12.5 | normal |