3827.51.00.00 - Containing trifluoromethane (HFC-23)

This HTS category, 3827.51.00.00, specifically covers mixtures that contain trifluoromethane (also known as HFC-23). The key characteristic for classification here is the presence of HFC-23 as a component within the mixture. These mixtures are intended for various industrial applications where the unique properties of HFC-23 are utilized, and they are not elsewhere specified or included in other HTS chapters.

This classification is distinguished from its sibling category, 3827.59.00.00, by the specific inclusion of trifluoromethane (HFC-23). While both fall under the broader heading of mixtures containing halogenated derivatives of methane, ethane, or propane (but not CFCs or HCFCs), 3827.51.00.00 is exclusively for those where HFC-23 is a definite constituent. The "Other" category (3827.59.00.00) would therefore encompass mixtures containing other perfluorocarbons (PFCs) or other combinations of halogenated derivatives that do not include HFC-23.

As a leaf node within the HTS structure, this category does not have further subdivisions. Therefore, the primary focus for accurate classification within 3827.51.00.00 is to confirm the presence of trifluoromethane (HFC-23) in the mixture. Importers and exporters should ensure that their product documentation clearly indicates the composition, specifically identifying HFC-23 as an ingredient, to facilitate correct customs processing under this heading.