| http://www.w3.org/ns/prov#value | - Replacements for CFCs have chiefly been volatile and flammable low-cost hydrocarbons, typically propane, n-butane and isobutane; compressed gasses, such as carbon dioxide or occasionally nitrogen; and substantially more expensive HFCs, such as HFC-134a, HFC-365mfc, and HFC-227.
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