RefrigerantASHRAE R-124

R124 PT Chart

Updated October 12, 2026

R-124

A1 Lower toxicity, no flame propagationHCFC ODS — HCFC Since 2015: production/import only as refrigerant for equipment made before 2020 · ends January 1, 2030

Illustration of a refrigerant cylinder painted light green gray (RAL 7044), the color AHRI Guideline N-2017 calls for on all new refrigerant containers from 2020^{[2], section 4.8}. Label: R-124, safety class A1, GWP 609. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[2], section 4.7}.

CHClFCF3

Pure HCFC, 1-chloro-1,2,2,2-tetrafluoroethane (CHClFCF₃). Since 2015 produced or imported in the US only as a refrigerant for equipment made before January 1, 2020; no production or import from January 1, 2030 (EPA). 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.

R-124 saturation pressure is 13.2 PSIG at 40°F, 34.4 PSIG at 70°F, and 66.2 PSIG at 100°F. These are the gauge readings on a static, fully-saturated system; a running system's high side sits well above them. The full table below runs from −40°F to 150°F in 1°F steps.

Not yet checked against an independent source.

Saturation @ 70°F

34.4 PSIG

GWP (100-yr)

609 IPCC AR4

Boiling point

10.5°F

R-124 PT calculator Superheat

R-124 PT chart — 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).

R-124 PT Chart — Pressure-Temperature Saturation Table

Computed with CoolProp 7.2.0 in 1°F steps · hvacptcharts.com

R-124 · 1° increments · °F / PSIG

Tinted rows: NBP atmospheric crossover · 32°F H₂O freeze

R-124 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	22.1 in. Hg vac.
−39°F	21.9 in. Hg vac.
−38°F	21.6 in. Hg vac.
−37°F	21.4 in. Hg vac.
−36°F	21.1 in. Hg vac.
−35°F	20.9 in. Hg vac.
−34°F	20.6 in. Hg vac.
−33°F	20.3 in. Hg vac.
−32°F	20.0 in. Hg vac.
−31°F	19.7 in. Hg vac.
−30°F	19.4 in. Hg vac.
−29°F	19.1 in. Hg vac.
−28°F	18.8 in. Hg vac.
−27°F	18.5 in. Hg vac.
−26°F	18.2 in. Hg vac.
−25°F	17.8 in. Hg vac.
−24°F	17.5 in. Hg vac.
−23°F	17.1 in. Hg vac.
−22°F	16.8 in. Hg vac.
−21°F	16.4 in. Hg vac.
−20°F	16.0 in. Hg vac.
−19°F	15.7 in. Hg vac.
−18°F	15.3 in. Hg vac.
−17°F	14.9 in. Hg vac.
−16°F	14.5 in. Hg vac.
−15°F	14.0 in. Hg vac.
−14°F	13.6 in. Hg vac.
−13°F	13.2 in. Hg vac.
−12°F	12.7 in. Hg vac.
−11°F	12.3 in. Hg vac.
−10°F	11.8 in. Hg vac.
−9°F	11.3 in. Hg vac.
−8°F	10.9 in. Hg vac.
−7°F	10.4 in. Hg vac.
−6°F	9.9 in. Hg vac.
−5°F	9.3 in. Hg vac.
−4°F	8.8 in. Hg vac.
−3°F	8.3 in. Hg vac.
−2°F	7.7 in. Hg vac.
−1°F	7.2 in. Hg vac.
0°F	6.6 in. Hg vac.
1°F	6.0 in. Hg vac.
2°F	5.5 in. Hg vac.
3°F	4.9 in. Hg vac.
4°F	4.2 in. Hg vac.
5°F	3.6 in. Hg vac.
6°F	3.0 in. Hg vac.
7°F	2.3 in. Hg vac.
8°F	1.7 in. Hg vac.
9°F	1.0 in. Hg vac.
10°F NBP (atmospheric)	0.3 in. Hg vac.
11°F	0.2
12°F	0.5
13°F	0.9
14°F	1.2
15°F	1.6
16°F	2.0
17°F	2.4
18°F	2.8
19°F	3.2
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°F H₂O 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	13.7
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	52.1
89°F	53.2
90°F	54.3
91°F	55.4
92°F	56.5
93°F	57.7
94°F	58.9
95°F	60.1
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	99.4
124°F	101.1
125°F	102.8
126°F	104.4
127°F	106.1
128°F	107.9
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	122.2
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

R-124 pressure-temperature saturation table in Celsius and kPa
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°C NBP (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°C H₂O 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	736
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
66°C	1,049

CoolProp 7.2.0 · PSIG/kPa = gauge · PSIA = PSIG + 14.6959 · kPa(abs) = kPa(gauge) + 101.325

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 (published Helmholtz equations of state / mixture models — see the source citations above).

Lower toxicity, no flame propagation

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

Pressure

Temperature

Highlight at°F

Quick lookup — R-124

Temp:°F

34.4PSIG(237 kPa)

Range: −40 to 150°F Open full PT calculator →

Common service temperatures

32°F

9PSIG

Freezing

45°F

16PSIG

Heat-pump heat

70°F

34PSIG

Standard

75°F

39PSIG

Test ref

80°F

44PSIG

Warm

95°F

60PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[3]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

CHClFCF3

1-Chloro-1,2,2,2-tetrafluoroethane

Lubricant compatibility

MOABPOE

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)
10.5°F (−12.0°C)
Critical point
252.1°F (122.3°C) at 511 PSIG
Molar mass
136.48 g/mol
ODP
0.022
GWP (100-yr)
609 IPCC AR4 IPCC: AR4 609 · AR5 527 · AR6 597
Atmospheric lifetime
5.9 years
New-equipment status (US)
Class II ODS (HCFC) — US production/import phased out (see timeline).

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. Since 2015 it has been produced or imported only as a refrigerant for equipment made before January 1, 2020, with no production or import from January 1, 2030 (EPA).

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

Since 2015 R-124 has been produced or imported in the US only as a refrigerant for equipment made before January 1, 2020, with no production or import from January 1, 2030 (EPA). 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.

Operating cycle

Phase-down timeline

R-124 is an ozone-depleting substance controlled under the US Clean Air Act (class II — HCFC). Milestones below are US production/import limits.

January 1, 2015 — No production or import, except as refrigerants in equipment manufactured before January 1, 2020^[1].
January 1, 2030 — No production or import^[1].

EPA: HCFC uses continue, such as for servicing refrigeration and air-conditioning equipment (production/import limits apply, not a ban on using existing equipment).

Global warming potential, in context

Retrofit and replacement paths

Replacements for R-124

R-124 vs R-134a, R-1234yf: saturation pressure

Saturation pressure (PSIG, gauge) for R-124 vs R-134a, R-1234yf. Each column shows the percent difference from R-124. Source: CoolProp 7.2.0 dataset.
Temp	R-124	R-134a	R-1234yf
0°F	6.6 in. Hg vac.	6.5	9.2
40°F	13.2	35.0(+166%)	38.4(+192%)
70°F	34.4	71.1(+107%)	73.9(+115%)
100°F	66.2	124.2(+88%)	124.9(+89%)

Frequently asked

›Why was R-124 phased out?

R-124 contains chlorine — ODP 0.022. Under the Montreal Protocol HCFC schedule, since 2015 R-124 has been produced or imported in the US only as a refrigerant for equipment made before January 1, 2020, with no production or import from January 1, 2030 (EPA). 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. Since 2015 it has been produced or imported only as a refrigerant for equipment made before January 1, 2020, with no production or import from January 1, 2030 (EPA). In practice, R-124-using equipment (R-409A, R-414B HCFC retrofit blends) is at end-of-service-life.

›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?

609. Moderate by HFC standards (lower than R-134a's 1,430, much lower than R-125's 3,500). 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.

Download this dataset

Full PT chart for R-124 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
Phaseout of Class II Ozone-Depleting Substances. US EPA. last updated April 1, 2026. https://www.epa.gov/ods-phaseout/phaseout-class-ii-ozone-depleting-substances (accessed October 2, 2026)
[2]
2017 Guideline for Assignment of Refrigerant Container Colors (AHRI Guideline N-2017). AHRI. 2017. https://www.ahrinet.org/system/files/2023-06/AHRI_Guideline_N_2017.pdf (accessed October 2, 2026)
[3]
CoolProp 7.2.0. CoolProp (I. H. Bell, J. Wronski, S. Quoilin, V. Lemort). https://coolprop.org/ (accessed October 2, 2026). Bell, I. H.; Wronski, J.; Quoilin, S.; Lemort, V. Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp. Ind. Eng. Chem. Res. 53, 2498–2508 (2014). https://doi.org/10.1021/ie4033999