3827.63.00.00 - Other, not included in the subheadings above, containing 40 percent or more by mass of pentafluoroethane (HFC-125)

This HTS classification, 3827.63.00.00, encompasses miscellaneous chemical mixtures primarily composed of halogenated derivatives of methane, ethane, or propane, specifically those containing 40 percent or more by mass of pentafluoroethane (HFC-125). These products are distinct from those classified under other HFC-containing subheadings within Chapter 38. The key determinant for classification here is the substantial presence of HFC-125, serving as a primary component.

Distinguishing this subheading from its siblings, 3827.63.00.00 focuses on mixtures where HFC-125 constitutes at least 40% by mass, but without the specific concentration thresholds or additional component restrictions found in other related subheadings. For instance, it differs from 3827.61.00.00 (presence of HFC-143a), 3827.62.00.00 (higher concentration of HFC-125 and absence of HFOs), and 3827.64.00.00 (presence of HFC-134a and absence of HFOs). It also excludes mixtures with specific combinations of difluoromethane and pentafluoroethane (3827.65.00.00) or those containing specified halogenated derivatives of methane or ethane (2903.41 to 2903.48).

As this is a leaf node in the HTS structure, there are no further subcategories. Therefore, classification under 3827.63.00.00 is final based on the specified criteria. Practical examples of products that might fall under this heading include certain refrigerant blends or specialized blowing agents where pentafluoroethane is the predominant ingredient and the mixture's composition meets the 40% threshold for HFC-125. Importers and exporters should ensure accurate quantitative analysis of their products to confirm compliance with this specific classification.