R-124
Pure HCFC, 1-chloro-1,2,2,2-tetrafluoroethane (CHClFCF₃). Production phased out in the US on January 1, 2015 under the HCFC schedule. Historical use as a blend component in R-22 retrofit blends (R-409A, R-414B) and as an aerosol propellant. Not used standalone in modern HVAC.
Lower toxicity (Occupational Exposure Limit ≥ 400 ppm). No flame propagation in air at standard atmospheric pressure and 60°C. R-134a, R-22, R-410A, R-404A, R-744 (CO2) are A1.
- Flammability
- None (no flame propagation)
- Toxicity
- Lower (OEL ≥ 400 ppm)
Classification per ANSI/ASHRAE Standard 34-2022. See full reference.
Saturation pressure-temperature curve
Saturation values from CoolProp 7.2.0 R124. Operating pressure on a running system differs — see the operating-pressure references for in-use values.
R-124 PT chart PDF — printable saturation table
Looking for the R-124 PT chart PDF for shop reference? The complete pressure-temperature saturation table is below — every 1° increment from −40°F to 150°F (or to the refrigerant's critical temperature). Use the Print / Save as PDF button in the table header to download a clean, table-only PDF (the rest of the page is hidden from the print output). Important service temperatures (normal boiling point, freezing point of water, residential AC evap and condenser targets) are tinted and tagged in the table for at-a-glance shop reference.
R-124 PT Chart — Pressure-Temperature Saturation Table
1° increments · Source: CoolProp 7.2.0 / manufacturer datasheet · hvacptcharts.com
| Temp (°F) | Pressure (PSIG) |
|---|---|
| -40°F | -10.9 |
| -39°F | -10.8 |
| -38°F | -10.6 |
| -37°F | -10.5 |
| -36°F | -10.4 |
| -35°F | -10.2 |
| -34°F | -10.1 |
| -33°F | -10.0 |
| -32°F | -9.8 |
| -31°F | -9.7 |
| -30°F | -9.5 |
| -29°F | -9.4 |
| -28°F | -9.2 |
| -27°F | -9.1 |
| -26°F | -8.9 |
| -25°F | -8.8 |
| -24°F | -8.6 |
| -23°F | -8.4 |
| -22°F | -8.2 |
| -21°F | -8.1 |
| -20°F | -7.9 |
| -19°F | -7.7 |
| -18°F | -7.5 |
| -17°F | -7.3 |
| -16°F | -7.1 |
| -15°F | -6.9 |
| -14°F | -6.7 |
| -13°F | -6.5 |
| -12°F | -6.3 |
| -11°F | -6.0 |
| -10°F | -5.8 |
| -9°F | -5.6 |
| -8°F | -5.3 |
| -7°F | -5.1 |
| -6°F | -4.8 |
| -5°F | -4.6 |
| -4°F | -4.3 |
| -3°F | -4.1 |
| -2°F | -3.8 |
| -1°F | -3.5 |
| 0°F | -3.3 |
| 1°F | -3.0 |
| 2°F | -2.7 |
| 3°F | -2.4 |
| 4°F | -2.1 |
| 5°F | -1.8 |
| 6°F | -1.5 |
| 7°F | -1.1 |
| 8°F | -0.8 |
| 9°F | -0.5 |
| 10°F | -0.2 |
| 11°FNBP (atmospheric) | 0.2 |
| 12°F | 0.5 |
| 13°F | 0.9 |
| 14°F | 1.3 |
| 15°F | 1.6 |
| 16°F | 2.0 |
| 17°F | 2.4 |
| 18°F | 2.8 |
| 19°F | 3.1 |
| 20°F | 3.6 |
| 21°F | 4.0 |
| 22°F | 4.4 |
| 23°F | 4.8 |
| 24°F | 5.2 |
| 25°F | 5.7 |
| 26°F | 6.1 |
| 27°F | 6.6 |
| 28°F | 7.0 |
| 29°F | 7.5 |
| 30°F | 8.0 |
| 31°F | 8.5 |
| 32°FH₂O freeze | 8.9 |
| 33°F | 9.4 |
| 34°F | 10.0 |
| 35°F | 10.5 |
| 36°F | 11.0 |
| 37°F | 11.5 |
| 38°F | 12.1 |
| 39°F | 12.6 |
| 40°F | 13.2 |
| 41°F | 13.8 |
| 42°F | 14.3 |
| 43°F | 14.9 |
| 44°F | 15.5 |
| 45°F | 16.1 |
| 46°F | 16.7 |
| 47°F | 17.3 |
| 48°F | 18.0 |
| 49°F | 18.6 |
| 50°F | 19.3 |
| 51°F | 19.9 |
| 52°F | 20.6 |
| 53°F | 21.3 |
| 54°F | 22.0 |
| 55°F | 22.7 |
| 56°F | 23.4 |
| 57°F | 24.1 |
| 58°F | 24.8 |
| 59°F | 25.6 |
| 60°F | 26.3 |
| 61°F | 27.1 |
| 62°F | 27.9 |
| 63°F | 28.6 |
| 64°F | 29.4 |
| 65°F | 30.2 |
| 66°F | 31.1 |
| 67°F | 31.9 |
| 68°F | 32.7 |
| 69°F | 33.6 |
| 70°F | 34.4 |
| 71°F | 35.3 |
| 72°F | 36.2 |
| 73°F | 37.1 |
| 74°F | 38.0 |
| 75°F | 38.9 |
| 76°F | 39.9 |
| 77°F | 40.8 |
| 78°F | 41.8 |
| 79°F | 42.7 |
| 80°F | 43.7 |
| 81°F | 44.7 |
| 82°F | 45.7 |
| 83°F | 46.7 |
| 84°F | 47.8 |
| 85°F | 48.8 |
| 86°F | 49.9 |
| 87°F | 51.0 |
| 88°F | 52.0 |
| 89°F | 53.1 |
| 90°F | 54.3 |
| 91°F | 55.4 |
| 92°F | 56.5 |
| 93°F | 57.7 |
| 94°F | 58.9 |
| 95°F | 60.0 |
| 96°F | 61.3 |
| 97°F | 62.5 |
| 98°F | 63.7 |
| 99°F | 64.9 |
| 100°F | 66.2 |
| 101°F | 67.5 |
| 102°F | 68.8 |
| 103°F | 70.1 |
| 104°F | 71.4 |
| 105°F | 72.7 |
| 106°F | 74.1 |
| 107°F | 75.4 |
| 108°F | 76.8 |
| 109°F | 78.2 |
| 110°F | 79.6 |
| 111°F | 81.0 |
| 112°F | 82.5 |
| 113°F | 83.9 |
| 114°F | 85.4 |
| 115°F | 86.9 |
| 116°F | 88.4 |
| 117°F | 89.9 |
| 118°F | 91.5 |
| 119°F | 93.0 |
| 120°F | 94.6 |
| 121°F | 96.2 |
| 122°F | 97.8 |
| 123°F | 99.5 |
| 124°F | 101.1 |
| 125°F | 102.8 |
| 126°F | 104.4 |
| 127°F | 106.1 |
| 128°F | 107.8 |
| 129°F | 109.6 |
| 130°F | 111.3 |
| 131°F | 113.1 |
| 132°F | 114.9 |
| 133°F | 116.7 |
| 134°F | 118.5 |
| 135°F | 120.4 |
| 136°F | 122.3 |
| 137°F | 124.1 |
| 138°F | 126.0 |
| 139°F | 128.0 |
| 140°F | 129.9 |
| 141°F | 131.9 |
| 142°F | 133.8 |
| 143°F | 135.8 |
| 144°F | 137.9 |
| 145°F | 139.9 |
| 146°F | 142.0 |
| 147°F | 144.1 |
| 148°F | 146.2 |
| 149°F | 148.3 |
| 150°F | 150.4 |
| Temp (°C) | Pressure (kPa) |
|---|---|
| -40°C | -75 |
| -39°C | -73 |
| -38°C | -72 |
| -37°C | -70 |
| -36°C | -69 |
| -35°C | -67 |
| -34°C | -65 |
| -33°C | -63 |
| -32°C | -61 |
| -31°C | -59 |
| -30°C | -57 |
| -29°C | -55 |
| -28°C | -52 |
| -27°C | -50 |
| -26°C | -47 |
| -25°C | -45 |
| -24°C | -42 |
| -23°C | -39 |
| -22°C | -36 |
| -21°C | -33 |
| -20°C | -30 |
| -19°C | -27 |
| -18°C | -23 |
| -17°C | -20 |
| -16°C | -16 |
| -15°C | -12 |
| -14°C | -8 |
| -13°C | -4 |
| -12°CNBP (atmospheric) | -0 |
| -11°C | 4 |
| -10°C | 9 |
| -9°C | 13 |
| -8°C | 18 |
| -7°C | 23 |
| -6°C | 28 |
| -5°C | 33 |
| -4°C | 39 |
| -3°C | 44 |
| -2°C | 50 |
| -1°C | 56 |
| 0°CH₂O freeze | 62 |
| 1°C | 68 |
| 2°C | 74 |
| 3°C | 81 |
| 4°C | 88 |
| 5°C | 95 |
| 6°C | 102 |
| 7°C | 109 |
| 8°C | 117 |
| 9°C | 125 |
| 10°C | 133 |
| 11°C | 141 |
| 12°C | 150 |
| 13°C | 158 |
| 14°C | 167 |
| 15°C | 176 |
| 16°C | 186 |
| 17°C | 195 |
| 18°C | 205 |
| 19°C | 215 |
| 20°C | 226 |
| 21°C | 236 |
| 22°C | 247 |
| 23°C | 258 |
| 24°C | 270 |
| 25°C | 281 |
| 26°C | 293 |
| 27°C | 306 |
| 28°C | 318 |
| 29°C | 331 |
| 30°C | 344 |
| 31°C | 357 |
| 32°C | 371 |
| 33°C | 385 |
| 34°C | 399 |
| 35°C | 414 |
| 36°C | 429 |
| 37°C | 444 |
| 38°C | 460 |
| 39°C | 476 |
| 40°C | 492 |
| 41°C | 509 |
| 42°C | 526 |
| 43°C | 543 |
| 44°C | 561 |
| 45°C | 579 |
| 46°C | 597 |
| 47°C | 616 |
| 48°C | 635 |
| 49°C | 655 |
| 50°C | 674 |
| 51°C | 695 |
| 52°C | 715 |
| 53°C | 737 |
| 54°C | 758 |
| 55°C | 780 |
| 56°C | 802 |
| 57°C | 825 |
| 58°C | 848 |
| 59°C | 872 |
| 60°C | 896 |
| 61°C | 920 |
| 62°C | 945 |
| 63°C | 970 |
| 64°C | 996 |
| 65°C | 1,022 |
Full saturation values at 1° increments — toggle between °F / PSIG and °C / kPa. Use Print / Save as PDF for laminated shop reference, or download the CSV / JSON below for use in other tools. R-124 PT chart data: CoolProp 7.2.0 (REFPROP-compatible Helmholtz EOS) or manufacturer datasheet, validated against AHRI Standard 700-2019.
At a glance
Chemistry
Lubricant compatibility
Historical use as a blend component in R-22 retrofits (R-409A, R-414B). Standalone use is rare.
Common applications
- Component in HCFC retrofit blends (legacy)
- Aerosol propellant (legacy)
Properties
- Boiling point (1 atm)-12.0°C / 10.5°F
- Critical point252.1°F at 511 PSIG
- Molar mass136.48 g/mol
- Temperature glideNegligible (0.00°F)
- ODP0.022
- GWP (AR5, 100-yr)527
- GWP (AR6, 100-yr)597
- Atmospheric lifetime5.9 years
What is R-124?
R-124 is a single-molecule hydrochlorofluorocarbon — the chlorine-bearing analog of R-134a with one fewer fluorine. The chlorine gives it non-zero ozone-depletion potential (ODP 0.022, low but not zero), placing it on the Montreal Protocol HCFC schedule. US production was phased out on January 1, 2015 alongside other small-volume HCFCs.
R-124's commercial role was always as a blend component rather than a standalone refrigerant. It appeared in R-22 retrofit blends — R-409A (R-22/R-124/R-142b), R-414B (R-22/R-124/R-600a/R-142b) — where its modest boiling point (10.5°F) and stability allowed it to contribute to the blend's overall properties. Standalone use was limited to aerosol propellant and some specialty fire-suppression applications, both also phased out.
Where R-124 is used
- Historical component in R-409A and R-414B (R-22 retrofit HCFC blends, themselves now phased out)
- Historical aerosol propellant in some specialty applications
- Not used standalone in HVAC or refrigeration
- Reclaimed R-124 supports any remaining equipment using HCFC blends containing it
Regulatory & phase-down status
R-124 production has been banned in the US since January 1, 2015 under the HCFC phase-out schedule. The HCFC blends that contained R-124 (R-409A, R-414B, R-414A) faced the same phase-out timeline. Remaining equipment using these blends operates on reclaimed refrigerant — a finite and shrinking supply.
For any encountered equipment using R-409A, R-414A, R-414B, or other R-124-containing blends, the modern path is full equipment replacement with R-32 (A2L) or R-454B (A2L) for AC applications, or one of the modern low-GWP HFC/HFO blends for refrigeration.
Service notes
Mineral oil (MO) and alkylbenzene (AB) are compatible. POE is not. EPA Section 608 Type II certification covers R-124 and its blends. Recovery is required.
R-124-containing blends are no longer practical service refrigerants — supply is reclaimed only, and the equipment using them is at end-of-life. Most service work involving R-124-containing equipment is recovery for disposal rather than recharge.
Operating cycle
Phase-down timeline
No phase-down milestones documented for R-124 in this build. This may mean: (a) no regulatory phase-down currently published; (b) the refrigerant has local regulatory schedules not yet transcribed into the site dataset; or (c) it is a specialty refrigerant outside the main regulatory frameworks. For authoritative current status, consult the EPA AIM Act allocations (40 CFR Part 84), EU F-Gas Regulation 517/2014 + 2024/573, and the relevant national implementations of the Kigali Amendment.
Global warming potential, in context
No peer-comparison group is defined for R-124. Its 100-year GWP per IPCC AR5 is 527 — between the EU F-Gas 150 cap and the EPA AIM Act 700 cap (AIM Act-compliant but not EU F-Gas-compliant for new stationary refrigeration in most categories).
Peer-comparison groups are defined for refrigerants that compete in the same application sector (residential AC, commercial MT/LT, chillers, mobile AC). Specialty or research-grade refrigerants without a clear peer set don't appear in any group; their GWP is shown above in absolute terms instead.
Retrofit and replacement paths
Replacements for R-124
Frequently asked
›Why was R-124 phased out?
R-124 contains chlorine — ODP 0.022. The Montreal Protocol HCFC phase-out schedule eliminated R-124 production in the US on January 1, 2015 as part of the broader HCFC elimination. Although R-124's ODP is low compared to R-22's 0.055 or R-12's 1.0, the Montreal Protocol's structure phased out all HCFCs on a defined timeline regardless of relative ODP magnitude.
›Is R-124 still legal to use?
Reclaimed R-124 is legal to use indefinitely in existing equipment under current EPA rules. New production has been banned since 2015. In practice, R-124-using equipment (R-409A, R-414B HCFC retrofit blends) is at end-of-service-life and most operators have replaced or are replacing it rather than continuing on reclaimed supply.
›What replaces R-124-containing blends?
For the AC applications where R-409A and R-414B were used as R-22 retrofits, the modern alternatives are full equipment replacement with R-32 or R-454B (A2L, low-GWP) — direct retrofit to those refrigerants isn't possible because they require A2L equipment. For systems built around R-124 blends specifically, equipment replacement is the practical path.
›What is the GWP of R-124?
527 per IPCC AR5. Moderate by HFC standards (lower than R-134a's 1430, much lower than R-125's 3500). However, the ODP of 0.022 was the binding regulatory concern — R-124 was phased out for ozone-depletion reasons under the Montreal Protocol, not for GWP reasons.