R-32 · CH2F2
R-32 (difluoromethane, CAS 75-10-5) 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 R32 and tabulated over -40–60 °C.
- Also known as
- HFC-32, Difluoromethane, Methylene fluoride, R32
- CAS number
- 75-10-5
- Tabulated range
- -40–60 °C · saturation line
- Refrigerant
- R-32
- Chemical name
- difluoromethane
- GWP (100-yr)
- 675
- ASHRAE 34 class
- A2L
GWP 675 — 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-32 (R-32) 100-year GWP = 675 (table reference IPCC 2007 / AR4). https://www.epa.gov/climate-hfcs-reduction/technology-transitions-gwp-reference-table
ASHRAE 34 A2L — 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-32 assigned safety group A2L.
- Saturation pressure
- 16.896bar
- Pressure
- 1689.6kPa
- Gauge
- 230.4psig
- Liquid density
- 961.0kg/m³
- Vapour density
- 47.34kg/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
- 16.896 bar
- Pressure
- 1689.6 kPa
- Gauge pressure
- 230.4 psig
- Liquid density
- 961.0 kg/m³
- Vapour density
- 47.34 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 | 177.4 | 1.774 | 11.0 | 1180.2 | 5.07 |
| -35 | 221.4 | 2.214 | 17.4 | 1165.7 | 6.25 |
| -30 | 273.4 | 2.734 | 25.0 | 1151.0 | 7.64 |
| -25 | 334.6 | 3.346 | 33.8 | 1135.9 | 9.27 |
| -20 | 405.8 | 4.058 | 44.2 | 1120.6 | 11.16 |
| -15 | 488.1 | 4.881 | 56.1 | 1104.9 | 13.35 |
| -10 | 582.6 | 5.826 | 69.8 | 1088.8 | 15.87 |
| -5 | 690.6 | 6.906 | 85.5 | 1072.3 | 18.77 |
| 0 | 813.1 | 8.131 | 103.2 | 1055.3 | 22.09 |
| 5 | 951.5 | 9.514 | 123.3 | 1037.8 | 25.89 |
| 10 | 1106.9 | 11.069 | 145.8 | 1019.6 | 30.23 |
| 15 | 1280.8 | 12.808 | 171.1 | 1000.9 | 35.19 |
| 20 | 1474.6 | 14.746 | 199.2 | 981.4 | 40.86 |
| 25 | 1689.6 | 16.896 | 230.4 | 961.0 | 47.34 |
| 30 | 1927.5 | 19.275 | 264.9 | 939.6 | 54.78 |
| 35 | 2189.8 | 21.898 | 302.9 | 917.0 | 63.34 |
| 40 | 2478.3 | 24.783 | 344.8 | 893.0 | 73.27 |
| 45 | 2794.8 | 27.948 | 390.7 | 867.3 | 84.86 |
| 50 | 3141.2 | 31.412 | 440.9 | 839.3 | 98.55 |
| 55 | 3519.9 | 35.199 | 495.8 | 808.3 | 114.99 |
| 60 | 3933.2 | 39.332 | 555.8 | 773.3 | 135.21 |
R-32 saturation pressure at a glance
At -20 °C, R-32 saturation pressure is about 4.06 bar (406 kPa; 44.2 psig). At 0 °C, R-32 saturation pressure is about 8.13 bar (813 kPa; 103.2 psig). At 25 °C, R-32 saturation pressure is about 16.90 bar (1690 kPa; 230.4 psig). At 40 °C, R-32 saturation pressure is about 24.78 bar (2478 kPa; 344.8 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-32 (CAS 75-10-5)
- ▸CoolProp 6.6.0 - reference Helmholtz equation of state for R-32 (Tillner-Roth & Yokozeki, 1997)
- ▸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 R32 · 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 | 1689.6 kPa |
| Model computed | 1689.62 kPa |
| 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, difluoromethane (R-32) (CAS 75-10-5), saturation curve at 25 degC: saturation pressure = 1689.6 kPa. https://webbook.nist.gov/cgi/fluid.cgi?ID=C75105&Action=Page
| Property / point | Saturated liquid density · 25 °C |
| Cited reference value | 961.01 kg/m3 |
| Model computed | 961.01 kg/m3 |
| 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, difluoromethane (R-32) (CAS 75-10-5), saturation curve at 25 degC: saturated liquid density = 961.01 kg/m3. https://webbook.nist.gov/cgi/fluid.cgi?ID=C75105&Action=Page
Before you use these numbers
- ▸CoolProp reference Helmholtz equation of state (Tillner-Roth & Yokozeki, 1997) for R-32. 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 78.11 degC / 5782.0 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 78.11 °C / 5782 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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