2935.50.00.00 - Other perfluorooctane sulfonamides

This HTS classification, 2935.50.00.00, encompasses perfluorooctane sulfonamides that do not fall under more specific subheadings within the 2935 group. These are chemical compounds characterized by the presence of a perfluorooctylsulfonyl group (-SO2(CF2)7CF3) attached to a nitrogen atom, where the structure does not match the precisely defined N-alkyl or N-hydroxyalkyl derivatives listed in preceding subheadings. Such compounds are typically synthetic and often employed as intermediates or in specialized industrial applications due to the unique properties imparted by their fluorinated structure.

The distinction of this category lies in its "residual" nature. While sibling categories like 2935.10.00.00 to 2935.40.00.00 specifically identify perfluorooctane sulfonamides based on their N-substituents (e.g., N-methyl, N-ethyl, or combinations with hydroxyethyl groups), 2935.50.00.00 serves as a catch-all for any other perfluorooctane sulfonamides. Therefore, the key differentiating factor is the absence of these specific N-substitutions, meaning any perfluorooctane sulfonamide not explicitly listed elsewhere within this chapter's sulfonamide section will be classified here.

As this is a leaf node, there are no further subcategories. Classification under 2935.50.00.00 is determined by a process of exclusion. If a substance is identified as a perfluorooctane sulfonamide and does not meet the specific structural criteria of any preceding 2935.10 through 2935.40 subheadings, it is definitively classified under this "other" designation. This ensures comprehensive coverage of all perfluorooctane sulfonamides within this tariff chapter.