§ 810.404 Grades and grade requirements for corn.
| Grade | Minimum test weight per bushel (pounds) | Maximum limits of | ||
|---|---|---|---|---|
| Damaged kernels | Broken corn and foreign material (percent) | |||
| Heat damaged kernels (percent) | Total (percent) | |||
| 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. |
[60 FR 61196, Nov. 29, 1995]