Code of Federal Regulations Title 7. Agriculture § 7.810.404 Grades and grade requirements for corn

U.S. No. 1

56.0

0.1

3.0

2.0

U.S. No. 2

54.0

0.2

5.0

3.0

U.S. No. 3

52.0

0.5

7.0

4.0

U.S. No. 4

49.0

1.0

10.0

5.0

U.S. No. 5

46.0

3.0

15.0

7.0

U.S. Sample Grade

U.S. Sample grade is corn that:

 (a) Does not meet the requirements for the grades U.S. Nos. 1, 2, 3, 4, or 5; or

 (b) Contains stones with an aggregate weight in excess of 0.1 percent of the sample weight, 2 or more pieces of glass, 3 or more crotalaria seeds (Crotalaria spp.), 2 or more castor beans (Ricinus communis L.), 4 or more particles of an unknown foreign substance(s) or a commonly recognized harmful or toxic substance(s), 8 or more cockleburs (Xanthium spp.), or similar seeds singly or in combination, or animal filth in excess of 0.20 percent in 1,000 grams; or

 (c) Has a musty, sour, or commercially objectionable foreign odor; or

 (d) Is heating or otherwise of distinctly low quality.