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The term "Freon" is a trademark of the DuPont Chemical Company. It applies to a fairly large collection of compounds classified as chlorofluorocarbons, or CFCs. The boiling points of the various Freons range from a low of -40.8 deg. C for the compound generally known as R-22 to a high of 91.5 deg. C for R-112. R-22 was once the predominant refrigerant for home refrigeration and residential central air conditioning. R-12, which was once the universal automotive air conditioning refrigerant, boils at -29.8 deg. C. Its replacement since 1994, R-134a, which is NOT a CFC and NOT a member of the Freon group, boils at -26.3 deg. C.

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