R-134a · CH2FCF3
R-134a (1,1,1,2-tetrafluoroethane, CAS 811-97-2) is a single-component refrigerant; this page gives its saturation pressure and saturated liquid and vapour densities from -40 to 60 °C.
Saturation pressure and saturated liquid and vapour densities are computed from CoolProp==6.6.0 - reference Helmholtz equation of state for R134a and tabulated over -40–60 °C.
- Also known as
- HFC-134a, 1,1,1,2-tetrafluoroethane, Norflurane, R134a
- CAS number
- 811-97-2
- Tabulated range
- -40–60 °C · saturation line
- Refrigerant
- R-134a
- Chemical name
- 1,1,1,2-tetrafluoroethane
- GWP (100-yr)
- 1430
- ASHRAE 34 class
- A1
GWP 1430 — IPCC Fourth Assessment Report (AR4, 2007), 100-year GWP. U.S. EPA - Technology Transitions GWP Reference Table. U.S. Environmental Protection Agency, Technology Transitions GWP Reference Table: HFC-134a 100-year GWP = 1,430 (basis IPCC 2007 / AR4; the AIM Act exchange values are numerically identical to the 100-year AR4 GWPs). https://www.epa.gov/climate-hfcs-reduction/technology-transitions-gwp-reference-table
ASHRAE 34 A1 — ANSI/ASHRAE Standard 34 safety group classification. ANSI/ASHRAE Standard 34 - Designation and Safety Classification of Refrigerants. ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of Refrigerants: R-134a assigned safety group A1.
- Saturation pressure
- 6.654bar
- Pressure
- 665.4kPa
- Gauge
- 81.8psig
- Liquid density
- 1206.7kg/m³
- Vapour density
- 32.35kg/m³
Read the saturation line either way
Set a temperature to read its saturation pressure and densities, or set a pressure to read the saturation temperature. Every number is interpolated from the committed table below and clamped to the validated -40–60 °C range — nothing is computed from a property model in your browser.
Values are interpolated along the tabulated saturation line below — both the temperature and the pressure stay within the validated -40–60 °C range and are never extrapolated.
- Saturation temp
- 25.0 °C
- Saturation pressure
- 6.654 bar
- Pressure
- 665.4 kPa
- Gauge pressure
- 81.8 psig
- Liquid density
- 1206.7 kg/m³
- Vapour density
- 32.35 kg/m³
Every tabulated point
Saturation pressure (absolute, shown in kPa and bar, with the gauge value in psig at standard atmosphere) and the saturated liquid and vapour densities at each temperature. A negative psig is a partial vacuum below one atmosphere.
| T °C | p kPa | p bar | p psig | ρ liq kg/m³ | ρ vap kg/m³ |
|---|---|---|---|---|---|
| -40 | 51.2 | 0.512 | −7.3 | 1417.7 | 2.77 |
| -35 | 66.1 | 0.661 | −5.1 | 1403.2 | 3.52 |
| -30 | 84.4 | 0.844 | −2.5 | 1388.4 | 4.43 |
| -25 | 106.4 | 1.064 | 0.7 | 1373.5 | 5.51 |
| -20 | 132.7 | 1.327 | 4.6 | 1358.3 | 6.78 |
| -15 | 163.9 | 1.639 | 9.1 | 1342.8 | 8.29 |
| -10 | 200.6 | 2.006 | 14.4 | 1327.1 | 10.04 |
| -5 | 243.3 | 2.433 | 20.6 | 1311.1 | 12.08 |
| 0 | 292.8 | 2.928 | 27.8 | 1294.8 | 14.43 |
| 5 | 349.7 | 3.497 | 36.0 | 1278.1 | 17.13 |
| 10 | 414.6 | 4.146 | 45.4 | 1261.0 | 20.23 |
| 15 | 488.4 | 4.884 | 56.1 | 1243.4 | 23.76 |
| 20 | 571.7 | 5.717 | 68.2 | 1225.3 | 27.78 |
| 25 | 665.4 | 6.654 | 81.8 | 1206.7 | 32.35 |
| 30 | 770.2 | 7.702 | 97.0 | 1187.5 | 37.53 |
| 35 | 887.0 | 8.870 | 113.9 | 1167.5 | 43.42 |
| 40 | 1016.6 | 10.166 | 132.7 | 1146.7 | 50.09 |
| 45 | 1159.9 | 11.599 | 153.5 | 1125.0 | 57.66 |
| 50 | 1317.9 | 13.179 | 176.5 | 1102.3 | 66.27 |
| 55 | 1491.5 | 14.915 | 201.6 | 1078.3 | 76.10 |
| 60 | 1681.8 | 16.818 | 229.2 | 1052.9 | 87.38 |
R-134a saturation pressure at a glance
At -20 °C, R-134a saturation pressure is about 1.33 bar (133 kPa; 4.6 psig). At 0 °C, R-134a saturation pressure is about 2.93 bar (293 kPa; 27.8 psig). At 25 °C, R-134a saturation pressure is about 6.65 bar (665 kPa; 81.8 psig). At 40 °C, R-134a saturation pressure is about 10.17 bar (1017 kPa; 132.7 psig).
Where the numbers come from
Every value on this page is computed by a deterministic equation of state — none is entered by hand. The generating method and the references it is checked against:
- ▸NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems (REFPROP-derived saturation tables), R-134a (CAS 811-97-2)
- ▸CoolProp 6.6.0 - reference Helmholtz equation of state for R-134a (Tillner-Roth & Baehr, 1994)
- ▸U.S. EPA - Technology Transitions GWP Reference Table (100-year GWP, IPCC AR4 basis)
- ▸ANSI/ASHRAE Standard 34-2022 - Designation and Safety Classification of Refrigerants
Model: CoolProp==6.6.0 - reference Helmholtz equation of state for R134a · Generated 2026-06-07
The committed data file for this page is published as JSON on GitHub under CC BY 4.0.
Checked against cited values
The equation of state is cross-checked against independently cited saturation points. The page is published only because every check passes.
| Property / point | Saturation pressure · 25 °C |
| Cited reference value | 665.38 kPa |
| Model computed | 665.38 kPa |
| Error vs reference | 0% (tolerance 1%) |
NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, 1,1,1,2-tetrafluoroethane (R-134a, CAS 811-97-2), saturation curve at 25 degC: saturation pressure = 665.38 kPa. https://webbook.nist.gov/cgi/fluid.cgi?ID=C811972&Action=Page
| Property / point | Saturated liquid density · 25 °C |
| Cited reference value | 1206.7 kg/m3 |
| Model computed | 1206.71 kg/m3 |
| Error vs reference | 0.001% (tolerance 1%) |
NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, 1,1,1,2-tetrafluoroethane (R-134a, CAS 811-97-2), saturation curve at 25 degC: saturated liquid density = 1206.7 kg/m3. https://webbook.nist.gov/cgi/fluid.cgi?ID=C811972&Action=Page
Before you use these numbers
- ▸CoolProp reference Helmholtz equation of state (Tillner-Roth & Baehr, 1994) for R-134a. Saturation properties only, tabulated from -40 to +60 degC; superheated and single-phase data are out of scope for this page. The critical point is 101.06 degC / 4059.3 kPa, well above the table top, so every tabulated state is sub-critical. Values are for preliminary design; verify against vendor data for critical service.
- ▸Saturation properties only — these are two-phase (saturation-line) values; superheated and sub-cooled single-phase data are out of scope for this page. The critical point is 101.06 °C / 4059.3 kPa, above the tabulated range.
- ▸Values are tabulated only inside the -40–60 °C range shown; the equation of state is not extrapolated beyond it here.
- ▸Use for preliminary design; verify for critical service.
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