3827.62.00.00 - Other, not included in the subheading above, containing 55 percent or more by mass of pentafluoroethane (HFC- 125) but not containing unsaturated fluorinated derivatives of acyclic hydrocarbons (HFOs)

This HTS subheading, 3827.62.00.00, specifically classifies mixtures predominantly composed of pentafluoroethane (HFC-125). To fall under this designation, the mixture must contain 55 percent or more of pentafluoroethane by mass. Crucially, these mixtures must not contain any unsaturated fluorinated derivatives of acyclic hydrocarbons, commonly referred to as hydrofluoroolefins (HFOs). Such mixtures are typically used in refrigeration, air conditioning, and as blowing agents, where the unique properties of HFC-125 are leveraged.

Distinguishing this subheading from its siblings is primarily based on the precise composition of the mixtures. For instance, subheading 3827.63.00.00 also covers mixtures containing pentafluoroethane but requires a lower concentration of 40 percent or more. Other siblings, like 3827.61.00.00 and 3827.64.00.00, classify mixtures based on the presence of different hydrofluorocarbons such as HFC-143a and HFC-134a, respectively, or specific combinations of HFCs as seen in 3827.65.00.00. The absence of HFOs is a common criterion across several related subheadings but the specific percentage of HFC-125 is the key differentiator here.

As this is a leaf node within the HTS structure, there are no further subdivisions. Therefore, the classification decision for goods falling under this description hinges solely on meeting the specified concentration of pentafluoroethane (HFC-125) and the explicit exclusion of HFOs. Importers and exporters must carefully analyze the composition of their chemical mixtures to ensure accurate classification under this particular subheading.