Which types of refrigerants are classified as non-ozone depleting?

Non-ozone depleting refrigerants are those that do not have a negative impact on the ozone layer. HFCs, or hydrofluorocarbons, are widely recognized as non-ozone depleting because they do not contain chlorine or bromine, which are the elements primarily responsible for ozone depletion. Certain hydrocarbon refrigerants, like propane and isobutane, also fall into this category. They are naturally occurring substances that do not contribute to ozone layer harm.

On the other hand, CFCs (chlorofluorocarbons) and hydrochlorofluorocarbons are well known for their capacity to deplete the ozone layer due to the presence of chlorine. Azeotropic mixtures can contain ozone-depleting substances, and halons are specifically designed chemicals that deplete the ozone layer significantly. Perfluorocarbons are also not considered non-ozone depleting as they have been linked with potential ozone depletion.

Thus, the classification of certain HFCs and hydrocarbon refrigerants as non-ozone depleting aligns with environmental standards and regulations aimed at ozone protection.