RefrigerantASHRAE R-502

R502 PT Chart

Updated October 12, 2026

R-502

A1 Lower toxicity, no flame propagationHCFC/CFC blend (azeotrope) ODS — HCFC/CFC CFC-115 US production banned · 1996

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^{[1], section 4.8}. Label: R-502, safety class A1, GWP 4,657. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[1], section 4.7}.

R-22/R-115 (48.8/51.2)

Azeotropic blend (ASHRAE 500 series) of 48.8% R-22 (HCFC-22) and 51.2% R-115 (CFC-115) by mass^[4]. Safety class A1^[3]. Mass-weighted from EPA's component values, its ODP is about 0.33 and its GWP 4,657 (IPCC AR4)^[5]. The US ban on production and import of CFC-115 took effect on January 1, 1996^[6], and of HCFC-22 on January 1, 2020^[8].

R-502 saturation pressure is 77.9 PSIG at 40°F, 133.9 PSIG at 70°F, and 211.8 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

133.9 PSIG

GWP (100-yr)

4,657 IPCC AR4, mass-weighted from component values

Temperature glide

0.3°F

Boiling point

−48.6°F

Sourced facts

ASHRAE safety class: A1^[3]
Composition (mass): 48.8% R-22 / 51.2% R-115^[4]
ODP: about 0.33, mass-weighted^[5]
GWP (100-yr): 4,657, mass-weighted (IPCC AR4)^[5]
Normal boiling point: bubble −48.6°F (−44.8°C), dew −47.8°F (−44.3°C)^[2]
Temperature glide: 0.3°F at a 40°F dew point^[2]
US production and import: CFC-115 ended January 1, 1996^[6]
Lubricant: Mineral oil or alkylbenzene^{[7], R-502 row}

R-502 PT calculator Superheat

R-502 PT chart — printable saturation table

Looking for the R-502 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-502 PT Chart — Pressure-Temperature Saturation Table

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

R-502 · 1° increments · °F / PSIG

Tinted rows: 32°F H₂O freeze

R-502 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	3.6
−39°F	4.0
−38°F	4.5
−37°F	5.0
−36°F	5.4
−35°F	5.9
−34°F	6.4
−33°F	6.9
−32°F	7.5
−31°F	8.0
−30°F	8.5
−29°F	9.1
−28°F	9.6
−27°F	10.2
−26°F	10.8
−25°F	11.4
−24°F	12.0
−23°F	12.6
−22°F	13.2
−21°F	13.8
−20°F	14.5
−19°F	15.1
−18°F	15.8
−17°F	16.4
−16°F	17.1
−15°F	17.8
−14°F	18.5
−13°F	19.3
−12°F	20.0
−11°F	20.7
−10°F	21.5
−9°F	22.3
−8°F	23.1
−7°F	23.8
−6°F	24.7
−5°F	25.5
−4°F	26.3
−3°F	27.2
−2°F	28.0
−1°F	28.9
0°F	29.8
1°F	30.7
2°F	31.6
3°F	32.5
4°F	33.5
5°F	34.4
6°F	35.4
7°F	36.4
8°F	37.4
9°F	38.4
10°F	39.4
11°F	40.5
12°F	41.5
13°F	42.6
14°F	43.7
15°F	44.8
16°F	45.9
17°F	47.0
18°F	48.2
19°F	49.4
20°F	50.6
21°F	51.8
22°F	53.0
23°F	54.2
24°F	55.5
25°F	56.7
26°F	58.0
27°F	59.3
28°F	60.6
29°F	62.0
30°F	63.3
31°F	64.7
32°F H₂O freeze	66.1
33°F	67.5
34°F	69.0
35°F	70.4
36°F	71.9
37°F	73.4
38°F	74.9
39°F	76.4
40°F	77.9
41°F	79.5
42°F	81.1
43°F	82.7
44°F	84.3
45°F	85.9
46°F	87.6
47°F	89.3
48°F	91.0
49°F	92.7
50°F	94.4
51°F	96.2
52°F	98.0
53°F	99.8
54°F	101.6
55°F	103.5
56°F	105.3
57°F	107.2
58°F	109.2
59°F	111.1
60°F	113.1
61°F	115.0
62°F	117.0
63°F	119.1
64°F	121.1
65°F	123.2
66°F	125.3
67°F	127.4
68°F	129.6
69°F	131.7
70°F	133.9
71°F	136.1
72°F	138.4
73°F	140.7
74°F	142.9
75°F	145.3
76°F	147.6
77°F	150.0
78°F	152.4
79°F	154.8
80°F	157.2
81°F	159.7
82°F	162.2
83°F	164.7
84°F	167.3
85°F	169.8
86°F	172.4
87°F	175.1
88°F	177.7
89°F	180.4
90°F	183.1
91°F	185.9
92°F	188.6
93°F	191.4
94°F	194.2
95°F	197.1
96°F	200.0
97°F	202.9
98°F	205.8
99°F	208.8
100°F	211.8
101°F	214.8
102°F	217.9
103°F	221.0
104°F	224.1
105°F	227.2
106°F	230.4
107°F	233.6
108°F	236.9
109°F	240.2
110°F	243.5
111°F	246.8
112°F	250.2
113°F	253.6
114°F	257.0
115°F	260.5
116°F	264.0
117°F	267.5
118°F	271.1
119°F	274.7
120°F	278.3
121°F	282.0
122°F	285.7
123°F	289.4
124°F	293.2
125°F	297.0
126°F	300.9
127°F	304.7
128°F	308.7
129°F	312.6
130°F	316.6
131°F	320.6
132°F	324.7
133°F	328.8
134°F	332.9
135°F	337.1
136°F	341.3
137°F	345.6
138°F	349.9
139°F	354.2
140°F	358.6
141°F	363.0
142°F	367.5
143°F	372.0
144°F	376.5
145°F	381.1
146°F	385.7
147°F	390.4
148°F	395.1
149°F	399.8
150°F	404.6

R-502 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	25
−39°C	30
−38°C	36
−37°C	42
−36°C	49
−35°C	55
−34°C	62
−33°C	69
−32°C	76
−31°C	83
−30°C	91
−29°C	99
−28°C	107
−27°C	115
−26°C	124
−25°C	133
−24°C	142
−23°C	151
−22°C	161
−21°C	171
−20°C	181
−19°C	192
−18°C	203
−17°C	214
−16°C	225
−15°C	237
−14°C	249
−13°C	262
−12°C	275
−11°C	288
−10°C	301
−9°C	315
−8°C	329
−7°C	344
−6°C	359
−5°C	374
−4°C	389
−3°C	405
−2°C	422
−1°C	439
0°C H₂O freeze	456
1°C	473
2°C	491
3°C	510
4°C	529
5°C	548
6°C	568
7°C	588
8°C	609
9°C	630
10°C	651
11°C	673
12°C	696
13°C	719
14°C	742
15°C	766
16°C	790
17°C	815
18°C	841
19°C	867
20°C	893
21°C	920
22°C	948
23°C	976
24°C	1,005
25°C	1,034
26°C	1,064
27°C	1,094
28°C	1,125
29°C	1,157
30°C	1,189
31°C	1,222
32°C	1,255
33°C	1,289
34°C	1,324
35°C	1,359
36°C	1,395
37°C	1,431
38°C	1,469
39°C	1,507
40°C	1,545
41°C	1,584
42°C	1,624
43°C	1,665
44°C	1,706
45°C	1,748
46°C	1,791
47°C	1,835
48°C	1,879
49°C	1,924
50°C	1,970
51°C	2,016
52°C	2,064
53°C	2,112
54°C	2,161
55°C	2,211
56°C	2,261
57°C	2,313
58°C	2,365
59°C	2,418
60°C	2,472
61°C	2,527
62°C	2,583
63°C	2,640
64°C	2,698
65°C	2,757
66°C	2,817

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-502 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^{[3], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-502

Temp:°F

133.9PSIG(923 kPa)

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

Common service temperatures

32°F

66PSIG

Freezing

45°F

86PSIG

Heat-pump heat

70°F

134PSIG

Standard

75°F

145PSIG

Test ref

80°F

157PSIG

Warm

95°F

197PSIG

Summer peak

Saturation values from CoolProp 7.2.0 mixture model: R-22/R-115, 48.8/51.2% by mass^[2]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

R-22/R-115 (48.8/51.2)

Azeotropic HCFC/CFC blend

Lubricant compatibility

MOABPOE

Azeotrope (ASHRAE 500 series)^[4]; computed glide 0.3°F at a 40°F dew point^[2].

Blend composition

R-22 48.8%
R-115 51.2%

Properties

Boiling point (1 atm)
bubble −48.6°F (−44.8°C), dew −47.8°F (−44.3°C)
Critical point
No single point — blend critical locus
Molar mass
111.63 g/mol
Temperature glide
0.3°F
ODP
0.33
GWP (100-yr)
4,657 IPCC AR4, mass-weighted from component values IPCC: AR4 4,657 · AR5 4,786 · AR6 5,872
New-equipment status (US)
Class I ODS (CFC) — US production/import ended January 1, 1996.

What is R-502?

R-502 is an azeotropic blend of 48.8% R-22 (chlorodifluoromethane, HCFC-22) and 51.2% R-115 (chloropentafluoroethane, CFC-115) by mass^[4]^[5]. The US ban on producing and importing CFC-115 took effect on January 1, 1996^[6].

Service notes

Copeland lists mineral oil and alkylbenzene for R-502^{[7], R-502 row}. Equipment using R-502 is a high-pressure appliance under 40 CFR 82.152^[9]; technicians servicing it need Section 608 Type II or Universal certification^[10], and venting the refrigerant is prohibited^[11].

Its computed glide is 0.3°F at a 40°F dew point^[2], so the table shows one column, the bubble pressure.

Operating cycle

Phase-down timeline

R-502 contains CFC-115, a class I ozone-depleting substance, and HCFC-22, a class II one^[5].

January 1, 1996 — CFC-115: US ban on production and import took effect^[6].
January 1, 2010 — HCFC-22: no production or import, except for use in equipment manufactured before January 1, 2010^[8].
January 1, 2020 — HCFC-22: no production or import^[8].

Servicing. Equipment using R-502 is a high-pressure appliance under 40 CFR 82.152^[9]; technicians servicing it need Section 608 Type II or Universal certification^[10], and venting the refrigerant is prohibited^[11].

Global warming potential, in context

Retrofit and replacement paths

Replacements for R-502

R-502 vs R-404A, R-507A, R-449A, R-454C: saturation pressure

Saturation pressure (PSIG, gauge) for R-502 vs R-404A, R-507A, R-449A, R-454C — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-502. Source: CoolProp 7.2.0 dataset.
Temp	R-502	R-404A	R-507A	R-449A	R-454C
0°F	29.8	33.7(+13%)	34.8(+17%)	24.2 / 33.4(+12%)	19.9 / 31.8(+7%)
40°F	77.9	86.9(+12%)	89.2(+15%)	71.6 / 87.4(+12%)	61.5 / 82.4(+6%)
70°F	133.9	149.3(+11%)	153.0(+14%)	129.4 / 151.0(+13%)	112.2 / 141.2(+5%)
100°F	211.8	236.8(+12%)	242.3(+14%)	212.7 / 240.0(+13%)	185.1 / 222.5(+5%)

Frequently asked

›Why was R-502 banned?

Its R-115 component — chloropentafluoroethane (CClF₂CF₃), 51.2% of the blend — is CFC-115, a class I ozone-depleting substance^[4]^[5]. R-115's ODP is 0.6, contributing the bulk of R-502's ≈0.33 blend ODP (mass-weighted: HCFC-22 0.055 at 48.8%, CFC-115 0.6 at 51.2%).^[5] The US ban on producing and importing CFC-115 took effect on January 1, 1996^[6]. US production and import of HCFC-22, the other 48.8%, ended on January 1, 2020^[8].

›Is R-502 an azeotrope or zeotrope?

An azeotrope: ASHRAE lists R-502 with the azeotropes (500 series)^[4]. Computed with CoolProp, its glide is 0.3°F at a 40°F dew point^[2].

›What is the GWP of R-502?

4,657 (IPCC AR4), mass-weighted from HCFC-22 (1,810) at 48.8% and CFC-115 (7,370) at 51.2%^[5].

Download this dataset

Full PT chart for R-502 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
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)
[2]
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
[3]
ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of Refrigerants (free read-only version). ASHRAE. 2022. https://www.ashrae.org/technical-resources/standards-and-guidelines/read-only-versions-of-ashrae-standards (accessed October 2, 2026)
[4]
ASHRAE Refrigerant Designations. ASHRAE. web page, updated May 25, 2021. https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations (accessed October 2, 2026)
[5]
Ozone-Depleting Substances. US EPA. last updated April 9, 2026. https://www.epa.gov/ozone-layer-protection/ozone-depleting-substances (accessed October 2, 2026)
[6]
Phaseout of Class I Ozone-Depleting Substances. US EPA. last updated March 10, 2026. https://www.epa.gov/ods-phaseout/phaseout-class-i-ozone-depleting-substances (accessed October 5, 2026)
[7]
Refrigerants and lubricants approved for use in Copeland compressors. Copeland. Form 93-11 R41 (5/24). https://webapps.copeland.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=93-11 (accessed October 2, 2026)
[8]
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)
[9]
40 CFR 82.152 — Definitions (Section 608). eCFR (Office of the Federal Register). current. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.152 (accessed October 2, 2026)
[10]
40 CFR 82.161 — Technician certification. eCFR (Office of the Federal Register). up to date as of 10/1/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.161 (accessed October 5, 2026)
[11]
Stationary Refrigeration — Prohibition on Venting Refrigerants. US EPA. last updated December 8, 2025. https://www.epa.gov/section608/stationary-refrigeration-prohibition-venting-refrigerants (accessed October 2, 2026)