2710.99.39.00 - Other

This HTS category, 2710.99.39.00, encompasses waste lubricating greases that do not fall under the specific exclusion outlined in the sibling category. Primarily, these are used or spent greases derived from petroleum oils or other bituminous substances. The key characteristic is their nature as waste products, meaning they have been used in industrial or automotive applications and are no longer suitable for their original purpose. This includes a broad range of grease formulations that have undergone degradation, contamination, or depletion of their performance additives.

The critical distinction between this category and its sibling, 2710.99.32.00, lies in the presence of salts of fatty acids of animal or vegetable origin. Category 2710.99.32.00 specifically covers waste lubricating greases containing *not over 10 percent by weight* of these particular additives. Therefore, waste greases classified under 2710.99.39.00 are either free of such salts, or they contain them in quantities exceeding 10 percent by weight, thus excluding them from the more narrowly defined sibling category.

As this is a leaf node within the HTS structure, there are no further subdivisions. Classification at this level requires careful consideration of the composition and origin of the waste grease. Importers and exporters must ensure that the waste grease is indeed a "waste oil" as defined in Chapter 27, and specifically a waste grease. The absence of specific additive percentages for fatty acid salts is the defining characteristic that places a waste grease into this "Other" classification.