(b)Clean yield. Except for the purposes of carbonized fibers, “Clean yield” means the absolute clean content (that is, all that portion of the merchandise which consists exclusively of wool or hair free of all vegetable and other foreign material, containing by weight 12 percent of moisture and 1.5 percent of material removable from the wool or hair by extraction with alcohol, and having an ash content of not over 0.5 percent by weight), less an allowance, equal by weight to 0.5 percent of the absolute clean content plus 60 percent of the vegetable matter present, but not exceeding 15 percent by weight of the absolute clean content, for wool or hair that would ordinarily be lost during commercial cleaning operations.
(c) For the purposes of carbonized fibers, the term clean yield means the condition as entered.
(d)Sampling unit. “Sampling unit” means all the similar packages covered by one entry or withdrawal containing wool or hair of the same kind or same general condition and character, produced in the same country, packed in substantially the same manner, and entered as or found to be subject to the same rate of entry.
(e)General sample. “General sample” means the composite of the individual portions of wool or hair drawn from a sampling unit.