3827.64.00.00 - Other, not included in the subheadings above, containing 30 percent or more by mass of 1,1,1,2-tetrafluoroethane (HFC-134a) but not containing unsaturated fluorinated derivatives of acyclic hydrocarbons (HFOs)

This HTS category, 3827.64.00.00, specifically covers miscellaneous chemical mixtures that contain 30 percent or more by mass of 1,1,1,2-tetrafluoroethane (commonly known as HFC-134a). Crucially, for a product to fall within this classification, it must *not* contain any unsaturated fluorinated derivatives of acyclic hydrocarbons, such as hydrofluoroolefins (HFOs). This distinction is vital as HFOs are often regulated separately due to their environmental properties.

To differentiate this category from its siblings, the primary criteria lie in the specific composition and concentration of hydrofluorocarbons (HFCs) present. For instance, sibling category 3827.61.00.00 focuses on mixtures containing 15 percent or more of 1,1,1-trifluoroethane (HFC-143a). Other siblings, like 3827.62.00.00 and 3827.63.00.00, are defined by the presence and concentration of pentafluoroethane (HFC-125) and exclude HFOs. Similarly, 3827.65.00.00 requires a specific combination of difluoromethane (HFC-32) and pentafluoroethane (HFC-125).

As this HTS classification is a leaf node, there are no further subcategories. Therefore, precise classification under 3827.64.00.00 hinges entirely on meeting the outlined percentage thresholds for HFC-134a and the explicit exclusion of HFOs. Examples of products that might fall here include refrigerant blends or specialized industrial solvents where HFC-134a is the dominant HFC component and HFOs are absent.