RefrigerantASHRAE R-1234yf

R1234yf PT Chart

Q: What is R-1234yf used for?

In the EU, Directive 2006/40/EC bars air conditioning designed for refrigerants with GWP above 150 (such as R-134a) in new vehicle types from January 1, 2011 and in all new cars and light vans (categories M1 and N1 class I) from January 1, 2017. In the US, 40 CFR 84.54(a)(13)(i) bars refrigerants with GWP of 150 or more in Model Year 2025 and later light-duty cars and trucks. EPA lists R-1234yf as acceptable, subject to use conditions, for new passenger cars and light-duty trucks.

Q: What's the GWP of R-1234yf?

The headline figure is 1 on the US EPA basis (40 CFR 84.64(b) Table 1) used for compliance and reporting [ecfr8464, §84.64(b)]. IPCC AR5 lists its 100-year GWP as less than 1; AR6 lists 0.501 [ipccar5, Table 8.A.1][ipccar6, Table 7.SM.7].

Q: Is R-1234yf flammable?

Yes. ASHRAE class A2L: lower flammability, with a burning velocity of 10 cm/s or less.

Q: What lubricant does R-1234yf use?

Use the oil the vehicle or equipment maker specifies.

Q: Can I retrofit an R-134a vehicle to R-1234yf?

Not as a straight swap. EPA lists R-1234yf for new passenger cars and light-duty trucks, and its use conditions require SAE J639 safety features, including unique service fittings.

Q: What is R-1234yf trade name?

Chemours sells it as Opteon™ YF; Solstice Advanced Materials, formerly part of Honeywell, sells it as Solstice® yf.

Updated October 20, 2026

R-1234yf

A2L Lower toxicity, lower flammabilityHFO (pure)

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^{[14], section 4.8}. Label: R-1234yf, safety class A2L, GWP 1. Red band on the shoulder: AHRI Guideline N-2017 calls for one on containers of flammable refrigerants^{[14], section 4.7}.

CF3CF=CH2

Pure HFO-1234yf (2,3,3,3-tetrafluoropropene)^[7]; EPA lists it for new passenger cars and light-duty trucks^[8]. A2L (lower flammability)^[1]^[8], GWP 1 on the US EPA basis (40 CFR 84.64(b))^[9], a single compound with no glide. Sold as Opteon™ YF by Chemours^[10] and Solstice® yf by Solstice Advanced Materials, formerly part of Honeywell^[11].

R-1234yf saturation pressure is 38.4 PSIG at 40°F, 73.9 PSIG at 70°F, and 124.9 PSIG at 100°F. These are static saturation pressures. The full table below runs from −40°F to 150°F in 1°F steps. For running pressures by outdoor temperature, see R-1234yf operating pressures.

Checked against the Chemours Opteon™ YF thermodynamic properties tables^[10] at 11 points from −40°F to 150°F: largest difference under 0.001 psi.

Saturation @ 70°F

73.9 PSIG

GWP (100-yr)

1 US EPA value, 40 CFR 84.64(b)

Boiling point

−21.1°F

Sourced facts

ASHRAE safety class: A2L^[1]
Chemical formula: CF₃CF=CH₂^[1]
GWP (100-yr): 1^[15]
ODP: 0^{[8], Environmental Impacts of MVAC Refrigerants table}
Normal boiling point: −21.1°F (−29.5°C)^[5]

R-1234yf PT calculator Operating pressures Superheat

R-1234yf PT chart — printable saturation table

Looking for the R-1234yf 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-1234yf PT Chart — Pressure-Temperature Saturation Table

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

R-1234yf · 1° increments · °F / PSIG

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

R-1234yf pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	11.5 in. Hg vac.
−39°F	11.0 in. Hg vac.
−38°F	10.5 in. Hg vac.
−37°F	10.0 in. Hg vac.
−36°F	9.4 in. Hg vac.
−35°F	8.9 in. Hg vac.
−34°F	8.3 in. Hg vac.
−33°F	7.8 in. Hg vac.
−32°F	7.2 in. Hg vac.
−31°F	6.6 in. Hg vac.
−30°F	6.0 in. Hg vac.
−29°F	5.4 in. Hg vac.
−28°F	4.7 in. Hg vac.
−27°F	4.1 in. Hg vac.
−26°F	3.4 in. Hg vac.
−25°F	2.8 in. Hg vac.
−24°F	2.1 in. Hg vac.
−23°F	1.4 in. Hg vac.
−22°F	0.7 in. Hg vac.
−21°F NBP (atmospheric)	0.0
−20°F	0.4
−19°F	0.8
−18°F	1.1
−17°F	1.5
−16°F	1.9
−15°F	2.3
−14°F	2.7
−13°F	3.1
−12°F	3.5
−11°F	4.0
−10°F	4.4
−9°F	4.9
−8°F	5.3
−7°F	5.8
−6°F	6.2
−5°F	6.7
−4°F	7.2
−3°F	7.7
−2°F	8.2
−1°F	8.7
0°F	9.2
1°F	9.7
2°F	10.3
3°F	10.8
4°F	11.4
5°F	12.0
6°F	12.5
7°F	13.1
8°F	13.7
9°F	14.3
10°F	14.9
11°F	15.5
12°F	16.2
13°F	16.8
14°F	17.5
15°F	18.1
16°F	18.8
17°F	19.5
18°F	20.2
19°F	20.9
20°F	21.6
21°F	22.3
22°F	23.1
23°F	23.8
24°F	24.6
25°F	25.4
26°F	26.2
27°F	26.9
28°F	27.8
29°F	28.6
30°F	29.4
31°F	30.3
32°F H₂O freeze	31.1
33°F	32.0
34°F	32.9
35°F	33.8
36°F	34.7
37°F	35.6
38°F	36.5
39°F	37.5
40°F	38.4
41°F	39.4
42°F	40.4
43°F	41.4
44°F	42.4
45°F	43.4
46°F	44.5
47°F	45.5
48°F	46.6
49°F	47.7
50°F	48.8
51°F	49.9
52°F	51.0
53°F	52.1
54°F	53.3
55°F	54.5
56°F	55.7
57°F	56.9
58°F	58.1
59°F	59.3
60°F	60.6
61°F	61.8
62°F	63.1
63°F	64.4
64°F	65.7
65°F	67.0
66°F	68.4
67°F	69.7
68°F	71.1
69°F	72.5
70°F	73.9
71°F	75.4
72°F	76.8
73°F	78.3
74°F	79.8
75°F	81.3
76°F	82.8
77°F	84.3
78°F	85.9
79°F	87.4
80°F	89.0
81°F	90.6
82°F	92.3
83°F	93.9
84°F	95.6
85°F	97.2
86°F	98.9
87°F	100.7
88°F	102.4
89°F	104.2
90°F	105.9
91°F	107.7
92°F	109.6
93°F	111.4
94°F	113.3
95°F	115.1
96°F	117.0
97°F	119.0
98°F	120.9
99°F	122.9
100°F	124.9
101°F	126.9
102°F	128.9
103°F	130.9
104°F	133.0
105°F	135.1
106°F	137.2
107°F	139.4
108°F	141.5
109°F	143.7
110°F	145.9
111°F	148.1
112°F	150.4
113°F	152.7
114°F	155.0
115°F	157.3
116°F	159.6
117°F	162.0
118°F	164.4
119°F	166.8
120°F	169.2
121°F	171.7
122°F	174.2
123°F	176.7
124°F	179.2
125°F	181.8
126°F	184.4
127°F	187.0
128°F	189.7
129°F	192.3
130°F	195.0
131°F	197.7
132°F	200.5
133°F	203.3
134°F	206.1
135°F	208.9
136°F	211.7
137°F	214.6
138°F	217.5
139°F	220.5
140°F	223.4
141°F	226.4
142°F	229.5
143°F	232.5
144°F	235.6
145°F	238.7
146°F	241.8
147°F	245.0
148°F	248.2
149°F	251.4
150°F	254.7

R-1234yf pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	−39
−39°C	−36
−38°C	−33
−37°C	−29
−36°C	−26
−35°C	−22
−34°C	−19
−33°C	−15
−32°C	−11
−31°C	−7
−30°C NBP (atmospheric)	−2
−29°C	2
−28°C	7
−27°C	12
−26°C	16
−25°C	22
−24°C	27
−23°C	32
−22°C	38
−21°C	44
−20°C	50
−19°C	56
−18°C	62
−17°C	69
−16°C	75
−15°C	82
−14°C	90
−13°C	97
−12°C	105
−11°C	112
−10°C	120
−9°C	129
−8°C	137
−7°C	146
−6°C	155
−5°C	164
−4°C	174
−3°C	184
−2°C	194
−1°C	204
0°C H₂O freeze	214
1°C	225
2°C	236
3°C	248
4°C	260
5°C	272
6°C	284
7°C	297
8°C	309
9°C	323
10°C	336
11°C	350
12°C	364
13°C	379
14°C	394
15°C	409
16°C	425
17°C	440
18°C	457
19°C	473
20°C	490
21°C	508
22°C	526
23°C	544
24°C	562
25°C	581
26°C	601
27°C	620
28°C	641
29°C	661
30°C	682
31°C	704
32°C	726
33°C	748
34°C	771
35°C	794
36°C	818
37°C	842
38°C	866
39°C	891
40°C	917
41°C	943
42°C	970
43°C	997
44°C	1,024
45°C	1,053
46°C	1,081
47°C	1,110
48°C	1,140
49°C	1,170
50°C	1,201
51°C	1,232
52°C	1,264
53°C	1,297
54°C	1,330
55°C	1,363
56°C	1,398
57°C	1,432
58°C	1,468
59°C	1,504
60°C	1,541
61°C	1,578
62°C	1,616
63°C	1,654
64°C	1,694
65°C	1,733
66°C	1,774

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-1234yf PT chart data: CoolProp 7.2.0 (published Helmholtz equations of state / mixture models — see the source citations above).

A2L

Lower toxicity, lower flammability

Lower toxicity. Flame propagates in air at 60°C, but with a low burning velocity (≤ 10 cm/s) and a heat of combustion < 19,000 kJ/kg. ASHRAE safety group A2L: lower toxicity and lower flammability. R-32, R-454B, R-1234yf, R-1234ze(E), R-452B, R-454C, R-455A, R-516A are A2L.

Flammability: Low (burning velocity ≤ 10 cm/s)
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-1234yf

Temp:°F

73.9PSIG(510 kPa)

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

Common service temperatures

32°F

31PSIG

Freezing

45°F

43PSIG

Heat-pump heat

70°F

74PSIG

Standard

75°F

81PSIG

Test ref

80°F

89PSIG

Warm

95°F

115PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[5]. Operating pressure on a running system differs — see what R-1234yf operating pressures should be.

At a glance

Chemistry

CF3CF=CH2

2,3,3,3-Tetrafluoropropene

Lubricant compatibility

POEPAGMO

Trade names

Opteon™ YF — Chemours^[10]
Solstice® yf — Solstice Advanced Materials (formerly Honeywell)^[11]

Common applications

Air conditioning in new passenger cars and light-duty trucks

Properties

Boiling point (1 atm)
−21.1°F (−29.5°C)
Critical point
202.5°F (94.7°C) at 476 PSIG
Molar mass
114.04 g/mol
ODP
0
GWP (100-yr)
1 US EPA value, 40 CFR 84.64(b) IPCC: AR4 not assessed · AR5 <1 · AR6 0.501
Atmospheric lifetime
0.029 years
New-equipment status (US)
Not an AIM Act regulated substance; 40 CFR 84.54 GWP limits don't apply.

What is R-1234yf?

R-1234yf is pure 2,3,3,3-tetrafluoropropene (CF₃CF=CH₂), a single-molecule hydrofluoroolefin (HFO) with a carbon-carbon double bond^{[7], R-1234yf}.

Where R-1234yf is used

Air conditioning in new passenger cars and light-duty trucks^[8]
A component of R-448A, R-449A, R-452A, R-452B, R-454B, R-454C, R-455A, R-457A, R-513A and R-516A^[7]

Regulatory & phase-down status

R-1234yf is not an AIM Act regulated substance, so the HFC phase-down and the 40 CFR 84.54 limits don't apply to it^[6]^[12].

Service notes

R-1234yf uses unique service fittings consistent with SAE J639: 17 mm on the high side and 14 mm on the low side^[13].

Operating cycle

Phase-down timeline

R-1234yf is not an AIM Act regulated substance (not one of the 18 HFCs in 42 U.S.C. 7675(c), and not a blend containing one). The 40 CFR 84.54 GWP limits don't apply.

Global warming potential, in context

Mobile air conditioning

Retrofit and replacement paths

R-1234yf replaces

R-134a A1 · GWP 1,430

Reading the R-1234yf PT chart

R-1234yf's PT chart is a single saturation curve: R-1234yf is a pure, single-component HFO with no temperature glide^[1]. Service measurement: superheat = suction-line temperature − saturation temperature at suction pressure; subcooling = saturation temperature at liquid-line pressure − liquid-line temperature. No glide correction needed.

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

Saturation pressure (PSIG, gauge) for R-1234yf vs R-134a. Each column shows the percent difference from R-1234yf. Source: CoolProp 7.2.0 dataset.
Temp	R-1234yf	R-134a
0°F	9.2	6.5
40°F	38.4	35.0(−9%)
70°F	73.9	71.1(−4%)
100°F	124.9	124.2(−1%)

Frequently asked

›What is R-1234yf used for?

In the EU, Directive 2006/40/EC bars air conditioning designed for refrigerants with GWP above 150 (such as R-134a) in new vehicle types from January 1, 2011 and in all new cars and light vans (categories M1 and N1 class I) from January 1, 2017^[4]. In the US, 40 CFR 84.54(a)(13)(i) bars refrigerants with GWP of 150 or more in Model Year 2025 and later light-duty cars and trucks^[12]. EPA lists R-1234yf as acceptable, subject to use conditions, for new passenger cars and light-duty trucks^[8].

›What's the GWP of R-1234yf?

The headline figure is 1 on the US EPA basis (40 CFR 84.64(b) Table 1) used for compliance and reporting^{[9], §84.64(b)}. IPCC AR5 lists its 100-year GWP as less than 1; AR6 lists 0.501^{[2], Table 8.A.1}^{[3], Table 7.SM.7}.

›Is R-1234yf flammable?

Yes. ASHRAE class A2L: lower flammability, with a burning velocity of 10 cm/s or less^[1]^[8].

›What lubricant does R-1234yf use?

Use the oil the vehicle or equipment maker specifies.

›Can I retrofit an R-134a vehicle to R-1234yf?

Not as a straight swap. EPA lists R-1234yf for new passenger cars and light-duty trucks, and its use conditions require SAE J639 safety features, including unique service fittings^[8]^[13].

›What is R-1234yf trade name?

Chemours sells it as Opteon™ YF^[10]; Solstice Advanced Materials, formerly part of Honeywell, sells it as Solstice® yf^[11].

Download this dataset

Full PT chart for R-1234yf · 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]
IPCC AR5 WG1 (2013), Chapter 8, Appendix 8.A, Table 8.A.1. IPCC AR5 Working Group I. 2013. https://www.ipcc.ch/report/ar5/wg1/ (accessed October 2, 2026)
[3]
IPCC AR6 WG1 (2021), Chapter 7, Supplementary Material, Table 7.SM.7. IPCC AR6 Working Group I. 2021. https://www.ipcc.ch/report/ar6/wg1/ (accessed October 2, 2026)
[4]
Directive 2006/40/EC (MAC Directive). EUR-Lex. OJ L 161, 14.6.2006. https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32006L0040 (accessed October 2, 2026)
[5]
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
[6]
42 U.S.C. 7675 — American Innovation and Manufacturing Act. US Code (via Cornell LII). current. https://www.law.cornell.edu/uscode/text/42/7675 (accessed October 2, 2026)
[7]
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)
[8]
Acceptable Refrigerants and their Impacts (motor vehicle A/C). US EPA. last updated April 28, 2026. https://www.epa.gov/mvac/acceptable-refrigerants-and-their-impacts (accessed October 2, 2026)
[9]
40 CFR 84.64 — Global warming potentials. eCFR (Office of the Federal Register). current as of 9/28/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-B/section-84.64 (accessed October 2, 2026)
[10]
Thermodynamic Properties of Opteon™ YF, Engineering (I/P) Units. Chemours. https://www.opteon.com/en/-/media/files/opteon/opteon-yf-thermodynamic-properties-eng.pdf (accessed October 2, 2026)
[11]
R-1234yf Refrigerant (Solstice® yf). Solstice Advanced Materials. product page. https://www.solstice.com/us/en/products/air-conditioning-refrigeration-and-heating/solstice-hfos/solstice-yf-r-1234yf (accessed October 2, 2026)
[12]
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)
[13]
Unique Fittings and Label Colors. US EPA. last updated June 8, 2026. https://www.epa.gov/mvac/unique-fittings-and-label-colors (accessed October 2, 2026)
[14]
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)
[15]
Technology Transitions GWP Reference Table. US EPA. updated April 2, 2026. https://www.epa.gov/hfcs/technology-transitions-gwp-reference-table (accessed October 2, 2026)