grade

capacity (g/L)

unsound kernel (%)

Impurity (%)

Moisture (%)

color and odor

first grade

≥720

≤4

≤1

≤14

normal

second grade

≥685

≤6

≤1

≤14

normal

third grade

≥650

≤8

≤1

≤14

normal

fourth grade

≥620

≤10

≤1

≤14

normal

fifth grade

≥590

≤15

≤1

≤14

normal

substandard

<590

≤15

≤1

≤14

normal