7 C.F.R. § 29.6126

Binder (B Group)

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Tobacco of this group is of cigar-binder quality from which trash and trashy Farm Fillers have been removed.

U.S. gradesGrade names, minimum specifications, and tolerances
B1Fine Quality Binder. Thin, ripe, open, elastic, strong, spready, and 19 inches or over in length. Uniformity, 90 percent; injury tolerance, 10 percent.
B2Fair Quality Binder. Medium body, ripe, open, semielastic, strong, normal width, and 19 inches or over in length. Uniformity, 80 percent; injury tolerance, 20 percent.
B3Low Quality Binder. Medium, ripe, firm, semielastic, normal strength and width, and 17 inches or over in length. Uniformity, 70 percent; injury tolerance, 30 percent.