3827.61.00.00 - Containing 15 percent or more by mass of 1,1,1-trifluoroethane (HFC-143a)

This HTS category, 3827.61.00.00, specifically covers chemical mixtures where 1,1,1-trifluoroethane (commonly known as HFC-143a) is the predominant halogenated hydrocarbon, constituting 15 percent or more by mass. These mixtures are generally proprietary blends of hydrofluorocarbons, often utilized as refrigerants, propellants, or blowing agents. Their classification here is contingent upon the absence of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), and the specific concentration of HFC-143a.

Distinguishing this subcategory from its siblings relies heavily on the precise composition and concentration of the hydrofluorocarbon components. For instance, sibling categories may focus on mixtures with different primary HFCs like pentafluoroethane (HFC-125) or 1,1,1,2-tetrafluoroethane (HFC-134a), or may have higher minimum percentage thresholds for their designated HFCs. Some siblings also explicitly exclude or include unsaturated fluorinated derivatives of acyclic hydrocarbons (HFOs), a criterion not directly applied to the determination of 3827.61.00.00, which centers on the presence of HFC-143a.

As this is a leaf node within the HTS structure, there are no further subcategories branching from 3827.61.00.00. Therefore, the classification of a product under this code is final, provided it meets the stipulated criteria for containing 15 percent or more by mass of 1,1,1-trifluoroethane (HFC-143a) and adheres to the broader scope of mixtures of halogenated derivatives of methane, ethane or propane, not elsewhere specified or included, which do not contain CFCs or HCFCs.