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