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Detailed Questions About HC-12a ®, OZ-12 ®, DURACOOL 12a ®, EC-12a, and other Flammable Hydrocarbon Refrigerants

If you have questions beyond those in this fact sheet, or would like paper copies of the lists, please call the Stratospheric Ozone Protection Hotline toll-free at 1 (800) 296-1996 or direct dial (202) 343-9210 to leave inquiries.

  1. What are HC-12a® and OZ-12®?
  2. What is DURACOOL 12a®? Is there a difference between HC-12a® and DURACOOL 12a®?
  3. What is the legal status of hydrocarbon refrigerants such as HC-12a® and DURACOOL 12a®?
  4. What is EC-12a and what is its legal status?
  5. May hydrocarbon refrigerants be used to replace CFC-12, commonly referred to as "Freon®," in cars?
  6. How did EPA make this determination?
  7. Why is it legal to use hydrocarbon refrigerants as CFC-12 substitutes in industrial process refrigeration, but not elsewhere?
  8. Gasoline and brake fluid are flammable, but they're allowed in cars. Why not hydrocarbon refrigerants?
  9. Is the sale of hydrocarbon refrigerants legal?
  10. Since the autoignition temperature of HFC-134a is lower than that of hydrocarbon refrigerants such as HC-12a® and DURACOOL 12a®, doesn't that mean that HFC-134a is more flammable than these hydrocarbons?
  11. What is a "sham retrofit" of a motor vehicle A/C system?
  12. May hydrocarbon refrigerants be vented?
  13. What other regulations restrict the use and handling of hydrocarbon refrigerants?
  14. Are there other refrigerants that can replace CFC-12?
  15. Are there any advantages to using flammable hydrocarbon refrigerants?
  16. Has EPA found any flammable refrigerants acceptable under SNAP?
  17. Is it legal to replace HFC-134a in a motor vehicle with hydrocarbon refrigerants such as DURACOOL 12a® and HC-12a®?


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