2903.59 - Other:

This HTS category, 2903.59, encompasses a range of halogenated derivatives of hydrocarbons, specifically unsaturated fluorinated derivatives of acyclic hydrocarbons, that are not otherwise specified. These compounds are characterized by the presence of fluorine atoms bonded to an unsaturated acyclic hydrocarbon chain. The "Other" designation signifies that this heading serves as a residual category for such fluorinated compounds not falling under more specific subheadings within the broader 2903.5 classification.

Distinguishing this category from its sibling, 2903.51, is crucial. While both deal with unsaturated fluorinated acyclic hydrocarbons, 2903.51 specifically enumerates certain refrigerants like 2,3,3,3-Tetrafluoropropene (HFO-1234yf), 1,3,3,3-tetrafluoropropene (HFO-1234ze), and (Z)-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz). Therefore, any unsaturated fluorinated acyclic hydrocarbon that does not precisely match the chemical structures or nomenclature of these specifically listed substances would fall under the broader scope of 2903.59.

Within 2903.59, two subcategories exist to provide further refinement. The subheading 2903.59.10.10 specifically covers 1,1,3,3,3-Pentafluoro-2-(trifluoromethyl)-prop-1-ene, a distinct chemical entity. The remaining products within this general category, those not fitting the description of 2903.59.10.10, are classified under 2903.59.90.00, maintaining the "Other" designation at a more granular level. This hierarchical structure allows for precise classification of a wide array of specialized fluorinated organic compounds.