RefrigerantASHRAE R-125

R125 PT Chart

Q: What's R-125's GWP?

3500 — very high. The 29-year atmospheric lifetime drives the high GWP. R-125's high GWP is the primary reason blends containing significant R-125 content (R-410A 50%, R-404A 44%) have high overall GWP and face aggressive phase-down.

Updated October 19, 2026

R-125

A1 Lower toxicity, no flame propagationHFC (pure) AIM Act HFC

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^{[5], section 4.8}. Label: R-125, safety class A1, GWP 3,500. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[5], section 4.7}.

CHF2CF3

Pure HFC (pentafluoroethane, CHF₂CF₃) — A1 non-flammable, GWP 3,500. Rarely used as a standalone refrigerant; a flammability-suppression component in HFC blends (R-410A, R-404A, R-407C, R-507A, others).

R-125 saturation pressure is 96.9 PSIG at 40°F, 165.5 PSIG at 70°F, and 261.4 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

165.5 PSIG

GWP (100-yr)

3,500 AIM Act exchange value (IPCC AR4)

Boiling point

−54.6°F

Sourced facts

ASHRAE safety class: A1^[1]
Chemical formula: CHF₂CF₃^[1]
GWP (100-yr): 3,500
ODP: 0^[1]
Normal boiling point: −54.6°F (−48.1°C)^[2]
Use as standalone: Rare^[4]
Component in R-410A: 50%^[1]
Component in R-404A: 44%^[1]

R-125 PT calculator Superheat

R-125 PT chart — printable saturation table

Looking for the R-125 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-125 PT Chart — Pressure-Temperature Saturation Table

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

R-125 · 1° increments · °F / PSIG

Tinted rows: 32°F H₂O freeze

R-125 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	6.8
−39°F	7.4
−38°F	7.9
−37°F	8.5
−36°F	9.1
−35°F	9.6
−34°F	10.2
−33°F	10.9
−32°F	11.5
−31°F	12.1
−30°F	12.8
−29°F	13.4
−28°F	14.1
−27°F	14.8
−26°F	15.5
−25°F	16.2
−24°F	16.9
−23°F	17.6
−22°F	18.4
−21°F	19.1
−20°F	19.9
−19°F	20.7
−18°F	21.5
−17°F	22.3
−16°F	23.1
−15°F	24.0
−14°F	24.8
−13°F	25.7
−12°F	26.6
−11°F	27.5
−10°F	28.4
−9°F	29.3
−8°F	30.3
−7°F	31.3
−6°F	32.2
−5°F	33.2
−4°F	34.2
−3°F	35.3
−2°F	36.3
−1°F	37.4
0°F	38.4
1°F	39.5
2°F	40.6
3°F	41.7
4°F	42.9
5°F	44.0
6°F	45.2
7°F	46.4
8°F	47.6
9°F	48.9
10°F	50.1
11°F	51.4
12°F	52.7
13°F	54.0
14°F	55.3
15°F	56.6
16°F	58.0
17°F	59.4
18°F	60.8
19°F	62.2
20°F	63.6
21°F	65.1
22°F	66.6
23°F	68.1
24°F	69.6
25°F	71.1
26°F	72.7
27°F	74.3
28°F	75.9
29°F	77.5
30°F	79.2
31°F	80.9
32°F H₂O freeze	82.6
33°F	84.3
34°F	86.0
35°F	87.8
36°F	89.6
37°F	91.4
38°F	93.2
39°F	95.1
40°F	96.9
41°F	98.9
42°F	100.8
43°F	102.7
44°F	104.7
45°F	106.7
46°F	108.7
47°F	110.8
48°F	112.9
49°F	115.0
50°F	117.1
51°F	119.3
52°F	121.4
53°F	123.7
54°F	125.9
55°F	128.2
56°F	130.4
57°F	132.8
58°F	135.1
59°F	137.5
60°F	139.9
61°F	142.3
62°F	144.8
63°F	147.2
64°F	149.8
65°F	152.3
66°F	154.9
67°F	157.5
68°F	160.1
69°F	162.8
70°F	165.5
71°F	168.2
72°F	170.9
73°F	173.7
74°F	176.5
75°F	179.4
76°F	182.2
77°F	185.2
78°F	188.1
79°F	191.1
80°F	194.1
81°F	197.1
82°F	200.2
83°F	203.3
84°F	206.4
85°F	209.6
86°F	212.8
87°F	216.0
88°F	219.3
89°F	222.6
90°F	226.0
91°F	229.3
92°F	232.8
93°F	236.2
94°F	239.7
95°F	243.2
96°F	246.8
97°F	250.4
98°F	254.0
99°F	257.7
100°F	261.4
101°F	265.1
102°F	268.9
103°F	272.7
104°F	276.6
105°F	280.5
106°F	284.5
107°F	288.4
108°F	292.5
109°F	296.5
110°F	300.6
111°F	304.8
112°F	309.0
113°F	313.2
114°F	317.5
115°F	321.8
116°F	326.1
117°F	330.5
118°F	335.0
119°F	339.5
120°F	344.0
121°F	348.6
122°F	353.2
123°F	357.9
124°F	362.6
125°F	367.4
126°F	372.2
127°F	377.1
128°F	382.0
129°F	387.0
130°F	392.0
131°F	397.1
132°F	402.2
133°F	407.3
134°F	412.6
135°F	417.9
136°F	423.2
137°F	428.6
138°F	434.0
139°F	439.5
140°F	445.1
141°F	450.7
142°F	456.4
143°F	462.2
144°F	468.0
145°F	473.9
146°F	479.9
147°F	485.9
148°F	492.1
149°F	498.3
150°F	504.6

R-125 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	47
−39°C	54
−38°C	61
−37°C	68
−36°C	76
−35°C	84
−34°C	92
−33°C	100
−32°C	109
−31°C	118
−30°C	127
−29°C	136
−28°C	146
−27°C	156
−26°C	167
−25°C	177
−24°C	188
−23°C	200
−22°C	211
−21°C	224
−20°C	236
−19°C	249
−18°C	262
−17°C	275
−16°C	289
−15°C	304
−14°C	318
−13°C	333
−12°C	349
−11°C	365
−10°C	381
−9°C	398
−8°C	415
−7°C	433
−6°C	451
−5°C	469
−4°C	488
−3°C	508
−2°C	528
−1°C	548
0°C H₂O freeze	569
1°C	591
2°C	613
3°C	635
4°C	658
5°C	682
6°C	706
7°C	730
8°C	755
9°C	781
10°C	807
11°C	834
12°C	862
13°C	890
14°C	919
15°C	948
16°C	978
17°C	1,008
18°C	1,040
19°C	1,071
20°C	1,104
21°C	1,137
22°C	1,171
23°C	1,205
24°C	1,241
25°C	1,277
26°C	1,313
27°C	1,351
28°C	1,389
29°C	1,428
30°C	1,467
31°C	1,508
32°C	1,549
33°C	1,591
34°C	1,633
35°C	1,677
36°C	1,721
37°C	1,766
38°C	1,813
39°C	1,859
40°C	1,907
41°C	1,956
42°C	2,005
43°C	2,056
44°C	2,107
45°C	2,159
46°C	2,213
47°C	2,267
48°C	2,322
49°C	2,378
50°C	2,435
51°C	2,494
52°C	2,553
53°C	2,613
54°C	2,675
55°C	2,738
56°C	2,801
57°C	2,866
58°C	2,933
59°C	3,000
60°C	3,069
61°C	3,139
62°C	3,211
63°C	3,284
64°C	3,359
65°C	3,436
66°C	3,515

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-125 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^{[1], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-125

Temp:°F

165.5PSIG(1,141 kPa)

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

Common service temperatures

32°F

83PSIG

Freezing

45°F

107PSIG

Heat-pump heat

70°F

165PSIG

Standard

75°F

179PSIG

Test ref

80°F

194PSIG

Warm

95°F

243PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[2]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

CHF2CF3

Pentafluoroethane

Lubricant compatibility

POEMOAB

Rarely used standalone. Primary applications are as a blend component (R-404A, R-407C, R-410A, R-507A) and as a clean agent (FM-200/HFC-227ea-class fire suppression in some lists, though HFC-227ea is the more common agent).

Trade names

Suva 125 — Chemours
Genetron 125 — Honeywell

Common applications

Blend component in R-404A, R-407C, R-410A, R-507A
Fire suppression (some applications)

Properties

Boiling point (1 atm)
−54.6°F (−48.1°C)
Critical point
150.8°F (66.0°C) at 510 PSIG
Molar mass
120.02 g/mol
ODP
0
GWP (100-yr)
3,500 AIM Act exchange value (IPCC AR4) IPCC: AR4 3,500 · AR5 3,170 · AR6 3,740
Atmospheric lifetime
28.2 years
New-equipment status (US)
Restricted in 41 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-125?

R-125 is pentafluoroethane (CHF₂CF₃) — a pure HFC with A1 safety classification and very high GWP (3,500)^[1]^[3].

R-125's role is as a blend component. R-125 is the primary flammability-suppression ingredient in major HFC blends — its A1 classification and high vapor pressure make it effective at keeping multi-component HFC blends in the A1 non-flammable safety class. Major blends using R-125: R-410A (50% R-125), R-404A (44%), R-407C (25%), R-507A (50%), R-407A (40%), R-407F (30%), and many others.

Where R-125 is used

Component in R-410A (50% mass) — primary residential AC HFC blend
Component in R-404A (44%) — legacy commercial refrigeration
Component in R-407C (25%) — R-22 retrofit blend
Component in R-507A (50%) — alternative R-502 replacement
Component in R-448A, R-449A — modern R-404A retrofit blends
Standalone fire suppression in some specialty applications

Regulatory & phase-down status

R-125 as a standalone refrigerant faces phase-down pressure under AIM Act and EU F-Gas Regulation due to its very high GWP (3,500).

As HFC blends containing R-125 are phased down (R-410A in residential AC from 2025, R-404A restricted by subsector 2025–2027 under 40 CFR 84.54), R-125 production volumes decrease accordingly. Modern low-GWP blends use less R-125 (R-454B contains zero R-125; R-454C contains zero R-125) — the structural trajectory is toward minimizing R-125 content in HFC formulations.

Service notes

POE oil compatible. Standard HFC service procedures apply when encountered in blend form.

Operating cycle

Phase-down timeline

R-125 is a regulated substance under the AIM Act. Its GWP under 40 CFR 84.64 is 3,500, at or above the limit in 41 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-125”).

HFC production & consumption allowances step down to 30% of baseline in 2029–2033, 20% of baseline in 2034–2035, and 15% of baseline in 2036 and later (42 U.S.C. 7675(e)(2)(C)).

Full 40 CFR 84.54 new-equipment rules for R-125 →

US new-equipment rules (40 CFR 84.54)

R-125 is a regulated substance under the AIM Act. Under 40 CFR 84.64(a) its GWP is 3,500, the AIM Act exchange value. That value is compared against each 40 CFR 84.54 subsector limit below.

All 84.54 categories restricting R-125 (41)^[3]

Refrigeration, air conditioning & heat pumps (34)
January 1, 2025	Self-contained residential & light-commercial AC and heat pump products	GWP ≥ 700	(a)(1)
January 1, 2025	Chillers for comfort cooling	GWP ≥ 700	(a)(10)(i)
January 1, 2025	Chillers for ice rinks	GWP ≥ 700	(a)(10)(ii)
January 1, 2025	Residential dehumidifiers	GWP ≥ 700	(a)(2)
January 1, 2025	Household refrigerators and freezers	GWP ≥ 150	(a)(3)
January 1, 2025	Retail food refrigeration — stand-alone units	GWP ≥ 150	(a)(4)
January 1, 2025	Vending machines	GWP ≥ 150	(a)(5)
January 1, 2025	Residential & light-commercial AC and heat pump systems (except VRF)	GWP ≥ 700	(c)(1)
January 1, 2025	Chillers for comfort cooling	GWP ≥ 700	(c)(3)
January 1, 2025	Ice rinks	GWP ≥ 700	(c)(4)
January 1, 2026	Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)	GWP ≥ 700	(a)(10)(iii)
January 1, 2026	Industrial process refrigeration products (non-chiller), charge 200 lb or greater, refrigerant entering the evaporator warmer than −22°F (−30°C)	GWP ≥ 150	(a)(12)(i)
January 1, 2026	Industrial process refrigeration products (non-chiller), charge less than 200 lb, refrigerant entering the evaporator warmer than −22°F (−30°C)	GWP ≥ 300	(a)(12)(ii)
January 1, 2026	Ice makers — batch type up to 1,000 lb of ice per 24 h and continuous type up to 1,200 lb per 24 h	GWP ≥ 150	(a)(8)(i)
January 1, 2026	Industrial process refrigeration systems (non-chiller), charge 200 lb or greater, evaporator inlet warmer than −22°F (−30°C), not the high-temperature side of a cascade	GWP ≥ 150	(c)(10)(i)
January 1, 2026	Industrial process refrigeration systems (non-chiller), charge less than 200 lb, evaporator inlet warmer than −22°F (−30°C)	GWP ≥ 300	(c)(10)(ii)
January 1, 2026	Industrial process refrigeration — high-temperature side of cascade systems, evaporator inlet warmer than −22°F (−30°C)	GWP ≥ 300	(c)(10)(iii)
January 1, 2026	Variable refrigerant flow (VRF) residential & light-commercial AC and heat pump systems	GWP ≥ 700	(c)(2)
January 1, 2026	Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)	GWP ≥ 700	(c)(5)(i)
July 27, 2026	Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higher	GWP ≥ 700	(a)(6)
July 27, 2026	Retail food refrigeration — remote condensing units	GWP ≥ 1,400	(c)(11)(i)
July 27, 2026	Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higher	GWP ≥ 700	(c)(7)
July 27, 2026	Cold storage warehouse systems	GWP ≥ 700	(c)(9)(i)
January 1, 2027	Self-contained products in data center, information technology equipment facility, and computer room cooling	GWP ≥ 700	(a)(11)
January 1, 2027	Refrigerated food processing and dispensing products outside the scope of UL 621, charge 500 g or less	GWP ≥ 150	(a)(9)(i)
January 1, 2027	Supermarket systems	GWP ≥ 1,400	(c)(12)(i)
January 1, 2027	Data center, information technology equipment facility, and computer room cooling systems	GWP ≥ 700	(c)(13)
January 1, 2028	Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(a)(10)(iv)
January 1, 2028	Industrial process refrigeration products (non-chiller), refrigerant entering the evaporator from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(a)(12)(iii)
January 1, 2028	Industrial process refrigeration systems (non-chiller), evaporator inlet from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(c)(10)(iv)
January 1, 2028	Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(c)(6)(i)
January 1, 2032	Retail food refrigeration — remote condensing units	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(11)(ii)
January 1, 2032	Supermarket systems	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(12)(ii)
January 1, 2032	Cold storage warehouse systems	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(9)(ii)
Motor vehicle air conditioning (3)
October 24, 2024	Motor vehicle air-conditioning in Model Year 2025 and later light-duty passenger cars and trucks (gross vehicle weight rating under 8,500 lb)	GWP ≥ 150	(a)(13)(i)
Model Year 2028	Motor vehicle air-conditioning in medium-duty passenger vehicles, heavy-duty pickup trucks and complete heavy-duty vans whose air-conditioning will not be modified by upfitters	GWP ≥ 150	(a)(13)(ii)
January 1, 2028	Motor vehicle air-conditioning in certain nonroad vehicles (agricultural tractors over 40 horsepower; self-propelled agricultural machinery; compact equipment; construction, forestry and mining equipment; and commercial utility vehicles)	GWP ≥ 150	(a)(13)(iii)
Foam blowing agents (2)
January 1, 2025	Foam products: rigid polyurethane appliance foam, commercial refrigeration foam, laminated boardstock, marine flotation foam, sandwich panels, slabstock; flexible polyurethane; integral skin polyurethane; polystyrene (extruded boardstock, billet, extruded sheet); phenolic insulation board and bunstock; polyisocyanurate laminated boardstock; polyolefin; rigid polyurethane spray foam	GWP ≥ 150	(a)(14)
January 1, 2026	Foam products in the (a)(14) formulations for use in space and military applications	GWP ≥ 150	(a)(15)
Aerosol propellants / solvents (2)
January 1, 2025	Aerosol products	GWP ≥ 150	(a)(16)(i)
January 1, 2028	Aerosol products (all, except defense sprays as defined in 84.3)	GWP ≥ 150	(a)(16)(ii)

Servicing. 40 CFR 84.54 restricts new manufacture/import, later sale/distribution, and installation. "Installation" is defined in 84.54(e); repairing or servicing existing R-125 equipment is not an installation unless it meets 84.54(e), so existing systems can keep being serviced. From January 1, 2029, servicing or repairing R-125 equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant^[6].

Source: 40 CFR 84.54, current through 91 FR 31329 (May 26, 2026). Installation defined at 40 CFR 84.54(e).

Global warming potential, in context

Reading the R-125 PT chart

R-125's PT chart is a single saturation curve. R-125's high vapor pressure is part of what makes R-125 useful as a blend component for raising the overall blend pressure envelope (e.g., R-125's high pressure contributes to R-410A's high operating pressure profile).

Frequently asked

›What is R-125 used for?

Almost entirely as a component in HFC blends. R-125's role is flammability suppression — its A1 classification and high vapor pressure suppress flammability in blends containing A2L components (like R-32) to produce A1 blends. Major blends: R-410A (50%), R-404A (44%), R-407C (25%), R-507A (50%)^[1].

›What's R-125's GWP?

3500 — very high^[3]. The 29-year atmospheric lifetime drives the high GWP. R-125's high GWP is the primary reason blends containing significant R-125 content (R-410A 50%, R-404A 44%) have high overall GWP and face aggressive phase-down.

›Why is R-125 used if its GWP is so high?

Flammability suppression. R-125 is A1 (non-flammable) and is effective at suppressing flammability in HFC blends containing A2L components like R-32 (lower flammability). Without R-125 (or equivalent A1 components), most HFC blends would be A2L and require A2L-rated equipment.

The trade-off — accepting high GWP for A1 classification — is the engineering tension driving the current HFC-to-A2L transition. Modern low-GWP blends (R-454B, R-454C, R-455A) accept A2L classification to avoid R-125's GWP burden.

›Can R-125 be used as a refrigerant by itself?

Technically yes (it has a usable PT curve). R-125 as a standalone refrigerant has very high GWP without compensating thermodynamic advantages over alternatives.

›Is R-125 being phased out?

Indirectly, through the phase-down of HFC blends containing R-125. As R-410A, R-404A, R-407C face AIM Act and EU F-Gas restrictions, R-125 production volumes decrease. The newer low-GWP blends (R-454B, R-454C, R-455A) contain little or no R-125, reflecting the structural trajectory away from high-GWP blend components.

Download this dataset

Full PT chart for R-125 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
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)
[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]
40 CFR 84.54 — Restrictions on the use of hydrofluorocarbons. eCFR (Office of the Federal Register). up to date as of 9/29/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-B/section-84.54 (accessed October 2, 2026)
[4]
ASHRAE Handbook — Refrigeration (2022). ASHRAE. 2022. https://www.ashrae.org/technical-resources/ashrae-handbook (accessed October 2, 2026)
[5]
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)
[6]
40 CFR 84.112 — Reclamation. eCFR (Office of the Federal Register). up to date as of 9/25/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-C/section-84.112 (accessed October 2, 2026). 89 FR 82859, Oct. 11, 2024