A refrigerant blend containing an HCFC and a CFC is considered a CFC.

A refrigerant blend that includes an HCFC (Hydrochlorofluorocarbon) and a CFC (Chlorofluorocarbon) is categorized as a CFC because the presence of CFC in the mixture classifies the blend under the CFC designation. CFCs are known for their ozone-depleting properties, and any blend containing CFC will carry the associated classifications and regulatory oversights.

In the context of refrigerants, classifications often hinge on the most harmful component, which in this case is the CFC. The implications are significant for environmental regulations as CFCs are subject to stricter phase-out timelines under international agreements like the Montreal Protocol due to their high ozone depletion potential. Even if the HCFC component has a lower environmental impact and is considered a transitional alternative, the blend retains the classification of CFC due to the presence of CFC within it.

Therefore, the nature of the blend being classified as a CFC holds true regardless of the ratios of HCFC to CFC, since the worst environmental impact dictates the classification rather than the blend's overall composition.