5101.21.10.00 - Wool for special uses

This HTS category, 5101.21.10.00, specifically covers shorn wool that has been degreased but not carbonized, and which has not undergone any further processing beyond the degreased state. Crucially, this designation applies to unimproved wool or other wool that is not finer than 46s count. This means the wool fibers possess a certain coarseness or staple length characteristic of these classifications.

Within the broader classification of "Wool, not carded or combed," this subcategory distinguishes itself from its sibling, "Other," by its specific limitations on wool quality and processing. While the sibling "Other" might encompass a wider range of wools or those with different processing levels, 5101.21.10.00 is precisely defined by the fineness standard (not finer than 46s) and the absence of any further treatment beyond degreasing.

As this is a leaf node in the HTS classification, there are no further subcategories to introduce. The classification is finalized at this point, with the defining characteristics being the degreased but not carbonized state, the type of wool (unimproved or other), and its fineness not exceeding the 46s count. This precise definition ensures that only wool meeting these specific physical and processing criteria falls under this tariff code.