Hydrobromofluorocarbon (HBFC) blends occupy a narrow but distinct classification niche within the broader family of ozone-depleting substance mixtures. HBFCs were targeted for phase-out under the Montreal Protocol alongside CFCs and halons, making these mixtures subject to EPA import controls under the Clean Air Act's ODS allowance framework. Because this heading has no children in the current US schedule, classification at the 10-digit level should be confirmed with a licensed customs broker or CBP binding ruling before shipment.

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