Refrigerant Knowledge Center
What Is R12 Refrigerant? Properties, Uses and Safety
R12 is a high-ODP CFC once used in domestic refrigeration, vehicle air conditioning and chillers; it has been phased out for new production in most markets under ozone-protection programs.
What Is R12?
R12 is a high-ODP CFC once used in domestic refrigeration, vehicle air conditioning and chillers; it has been phased out for new production in most markets under ozone-protection programs.
R12 is classified as single component in the CFC family. Its composition is 100% R12 (dichlorodifluoromethane). Refrigerant choice is never based on designation alone: capacity, pressure, lubricant, controls, heat-exchanger behavior, safety standards and local rules all matter.
R12 Technical Properties
General reference values for comparison; a current product specification and applicable regulatory basis govern a transaction.
| Refrigerant designation | R12 |
|---|---|
| Chemical family | CFC |
| Composition | 100% R12 (dichlorodifluoromethane) |
| Blend type | single component |
| ASHRAE safety class | A1 |
| 100-year GWP | 10900 (IPCC AR4 100-year) |
| Ozone depletion potential | 1 |
| Normal boiling reference | -29.8 °C |
Common R12 Applications
Typical references include legacy domestic refrigeration, legacy mobile air conditioning, and legacy chillers.
Use depends on equipment design, operating envelope and applicable local requirements.
Use depends on equipment design, operating envelope and applicable local requirements.
Use depends on equipment design, operating envelope and applicable local requirements.
Advantages and Limitations
Selection advantages
- Established refrigerant designation with published reference data.
- Application history in legacy domestic refrigeration.
- ODP reference of 1.
Important limitations
- A1 safety controls must be applied.
- GWP and lifecycle status can affect long-term selection.
- No refrigerant should be treated as a universal drop-in.
Environmental Impact and Regulation
This is a legacy, phased-out refrigerant; only narrowly defined recovered or reclaimed uses may remain under specific local rules.
R12 has an ODP reference of 1 and a stated GWP of 10900 using IPCC AR4 100-year. Regulations commonly distinguish between manufacturing or import, new equipment, servicing, recovered material and individual end uses.
Safety, Handling and Storage
Recovery and servicing must follow local controls for ozone-depleting substances; never vent R12 and do not substitute another refrigerant without an approved conversion plan.
The A1 classification describes toxicity and flammability groupings; it does not by itself approve a refrigerant for a particular system. Review the current safety data sheet, cylinder label, transport classification, equipment manual and local code.
R12 Alternatives and Comparisons
Candidate alternatives must be evaluated as system choices, not simple chemical substitutions.
HFC; A1 safety class; GWP 1430 on the stated IPCC AR4 100-year basis.
hydrocarbon; A3 safety class; GWP 3 on the stated IPCC AR4 100-year basis.
HFO; A2L safety class; GWP 1 on the stated IPCC AR5 100-year, manufacturer-reported basis.
R12 Frequently Asked Questions
What is R12 made of?
100% R12 (dichlorodifluoromethane); it is categorized as single component.
What is the safety class of R12?
The published classification used in this guide is A1. Equipment approval and local safety rules still apply.
What is the GWP of R12?
The reference here is 10900 on the IPCC AR4 100-year basis. Other assessment bases may show a different number.
Can R12 replace another refrigerant directly?
No universal drop-in claim is made. Compatibility and conversion requirements must be confirmed for the exact equipment.
Where is R12 commonly used?
Typical applications include legacy domestic refrigeration, legacy mobile air conditioning, and legacy chillers, subject to equipment design and local approval.
References and Technical Sources
Source data is summarized for general education. Always use current official documents, standards and supplier-specific safety and technical data for engineering or compliance decisions.
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