7 C.F.R. § 868.310 – Grades and grade requirements for the classes Long Grain Milled Rice, Medium Grain Milled Rice, Short Grain Milled Rice, and Mixed Milled Rice. (See also § 868.315.)

Grades, Grade Requirements, and Grade Designations
Grade	Maximum limits of—	Colorrequirements 1	Minimummillingrequirements 5
Seeds, heatdamaged, and paddy kernels(singly or combined)	Red rice anddamagedkernels (singlyorcombined) (percent)	Chalky kernels 1 2	Broken kernels	Other types 4
Total (number in 500 grams)	Heatdamagedkernels and objectionable seeds (numberin 500 grams)	In long grainrice (percent)	Inmedium or short grain rice (percent)	Total (percent)	Removed by a 5 plate 3 (percent)	Removed by a 6 plate 3 (percent)	Through a 6 sieve 3 (percent)	Whole kernels (percent)	Whole andbrokenkernels (percent)
U.S. No. 1	2	1	0.5	1.0	2.0	4.0	0.04	0.1	0.1		1.0	White or creamy	Well Milled.
U.S. No. 2	4	2	1.5	2.0	4.0	7.0	0.06	0.2	0.2		2.0	Slightly gray	Well Milled.
U.S. No. 3	7	5	2.5	4.0	6.0	15.0	0.1	0.8	0.5		3.0	Light gray	Reasonably well milled.
U.S. No. 4	20	15	4.0	6.0	8.0	25.0	0.4	1.0	0.7		5.0	Gray or slightly rosy	Reasonably well milled.
U.S. No. 5	30	25	5 6.0	10.0	10.0	35.0	0.7	3.0	1.0	10.0		Dark gray or rosy	Reasonably well milled.
U.S. No. 6	75	75	6 15.0	15.0	15.0	50.0	1.0	4.0	2.0	10.0		Dark gray or rosy	Reasonably well milled.
U.S. Sample grade:
U.S. Sample grade shall be milled rice of any of these classes which: (a) Does not meet the requirements for any of the grades from U.S. No. 1 to U.S. No. 6, inclusive; (b) contains more than 15.0 percent of moisture; (c) is musty or sour, or heating; (d) has any commercially objectionable foreign odor; (e) contains more than 0.1 percent of foreign material; (f) Contains two or more live or dead weevils or other insects, insect webbing, or insect refuse; (g) is otherwise of distinctly low quality.
1 For the special grade Parboiled milled rice, see § 868.315(c).
2 For the special grade Glutinous milled rice, see § 868.315(e).
3 Plates should be used for southern production rice; and sieves should be used for western production rice, but any device or method which gives equivalent results may be used.
4 These limits do not apply to the class Mixed Milled Rice.
5 For the special grade Undermilled milled rice, see § 868.315(d).
6 Grade U.S. No. 6 shall contain not more than 6.0 percent of damaged kernels.

[67 FR 61250, Sept. 30, 2002, as amended at 70 FR 37255, June 29, 2005]