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Refrigerants & gases

R-404A · R-125/R-143a/R-134a

R-404A is a blend of R-125, R-143a and R-134a (44/52/4 by weight); this page gives its bubble- and dew-point pressures and saturated liquid and vapour densities from -40 to 60 °C.

Bubble- and dew-point pressures and saturated liquid and vapour densities are computed from CoolProp==6.6.0 - multi-fluid Helmholtz-energy mixture model for the predefined blend R404A and tabulated over -40–60 °C.

Also known as
R404A, HFC blend R-125/R-143a/R-134a, R-404a
Component CAS
354-33-6 (R-125), 420-46-2 (R-143a), 811-97-2 (R-134a)
Tabulated range
-40–60 °C · saturation line
Designation
Refrigerant
R-404A
Composition
R-125/R-143a/R-134a (44/52/4 wt%)
GWP (100-yr)
3922
ASHRAE 34 class
A1
Blend components
R-125 / R-143a / R-134a (44 / 52 / 4 wt%)
Glide at 1 atm
0.75K

GWP 3922 — Calculated 100-year GWP, mass-weighted from the AR4 component values (basis attributed by the U.S. EPA Technology Transitions GWP Reference Table). U.S. EPA - Technology Transitions GWP Reference Table. U.S. Environmental Protection Agency, Technology Transitions GWP Reference Table: R-404A 100-year GWP = 3,922 (table reference: Calculated). 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-404A assigned safety group A1.

At 25 °C (saturation)
reference snapshot
Bubble pressure
12.546bar
Bubble gauge
167.3psig
Dew pressure
12.412bar
Dew gauge
165.3psig
Liquid density
1044.0kg/m³
Vapour density
65.26kg/m³
Explore

Read the saturation lines either way

Set a temperature to read its bubble- and dew-point pressures and densities, or set a pressure to read the saturation temperature on the dew line. 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.

Interactive explorer

Values are interpolated along the tabulated saturation lines below — both the temperature and the pressure stay within the validated -40–60 °C range and are never extrapolated. For this blend, the temperature direction reads both the bubble- and dew-point pressures; the pressure direction inverts the dew-point line.

25 °C
Saturation temp
25.0 °C
Bubble pressure
12.546 bar
Dew pressure
12.412 bar
Bubble gauge
167.3 psig
Dew gauge
165.3 psig
Liquid density
1044.0 kg/m³
Vapour density
65.26 kg/m³
Bubble (solid) and dew (dashed) pressure (bar) vs temperature (°C) — R-404A.
Saturation table

Every tabulated point

Bubble- and dew-point pressures (absolute, shown in kPa and bar, with the gauge value in psig at standard atmosphere) and the bubble-point liquid and dew-point vapour densities at each temperature. A negative psig is a partial vacuum below one atmosphere.

T °CBubbleDewρ liq kg/m³ρ vap kg/m³
kPabarpsigkPabarpsig
-40135.31.3534.9131.01.3104.31287.06.99
-35168.51.6859.7163.61.6369.01271.18.62
-30207.82.07815.4202.22.02214.61255.010.55
-25253.72.53722.1247.52.47521.21238.612.80
-20307.13.07129.8300.23.00228.81221.815.41
-15368.63.68638.8361.03.61037.71204.618.43
-10439.14.39149.0430.74.30747.81186.921.90
-5519.45.19460.6510.25.10259.31168.725.89
0610.26.10273.8600.36.00372.41150.030.46
5712.57.12588.6701.87.01887.11130.635.68
10827.18.271105.3815.78.157103.61110.441.65
15955.09.550123.8942.99.429122.11089.348.48
201097.210.972144.41084.410.844142.61067.356.29
251254.612.546167.31241.212.412165.31044.065.26
301428.414.284192.51414.514.145190.51019.475.59
351619.616.196220.21605.316.053218.1993.087.57
401829.518.295250.71815.018.149248.5964.6101.57
452059.520.595284.02044.720.447281.9933.5118.15
502310.923.109320.52296.222.962318.3899.0138.10
552585.425.854360.32570.925.709358.2859.8162.79
602885.028.850403.72871.228.712401.7813.3194.68
Typical values

R-404A bubble and dew pressure at a glance

At -20 °C, R-404A bubble pressure is about 3.07 bar (307 kPa; 29.8 psig); dew pressure is 3.00 bar (28.8 psig). At 0 °C, R-404A bubble pressure is about 6.10 bar (610 kPa; 73.8 psig); dew pressure is 6.00 bar (72.4 psig). At 25 °C, R-404A bubble pressure is about 12.55 bar (1255 kPa; 167.3 psig); dew pressure is 12.41 bar (165.3 psig). At 40 °C, R-404A bubble pressure is about 18.30 bar (1830 kPa; 250.7 psig); dew pressure is 18.15 bar (248.5 psig).

Sources

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:

  • ▸Arkema Forane 404A - Thermodynamic Properties (Saturation), SI (data generated with NIST REFPROP v9.0); blend bubble/dew pressures and densities
  • ▸CoolProp 6.6.0 - multi-fluid Helmholtz-energy mixture model for the predefined blend R404A
  • ▸U.S. EPA - Technology Transitions GWP Reference Table (100-year GWP, calculated from AR4 component values)
  • ▸ANSI/ASHRAE Standard 34-2022 - Designation and Safety Classification of Refrigerants

Model: CoolProp==6.6.0 - multi-fluid Helmholtz-energy mixture model for the predefined blend R404A · Generated 2026-06-07

The committed data file for this page is published as JSON on GitHub under CC BY 4.0.

Validation

Checked against cited values

NIST WebBook does not tabulate blends, so the equation of state is cross-checked against a named manufacturer/handbook saturation table. The page is published only because every check passes.

Property / pointBubble-point pressure · 25 °C
Cited reference value1254.6 kPa
Model computed1254.58 kPa
Error vs reference0.002% (tolerance 1.5%)

Arkema Forane 404A - Thermodynamic Properties (Saturation), SI (REFPROP v9.0). Arkema, Forane 404A Thermodynamic Properties (Saturation) - SI (data generated with NIST REFPROP Database 23, v9.0), R-404A saturation table at 25 degC: bubble-point (liquid) pressure = 1254.6 kPa. https://www.arkema.com/files/live/sites/shared_arkema/files/downloads/fluorochemicals/forane-404a-thermodynamic-properties-si.pdf

Property / pointSaturated liquid density · 25 °C
Cited reference value1044.1 kg/m3
Model computed1044.03 kg/m3
Error vs reference0.007% (tolerance 1.5%)

Arkema Forane 404A - Thermodynamic Properties (Saturation), SI (REFPROP v9.0). Arkema, Forane 404A Thermodynamic Properties (Saturation) - SI (data generated with NIST REFPROP Database 23, v9.0), R-404A saturation table at 25 degC: bubble-point (liquid) density = 1044.1 kg/m3. https://www.arkema.com/files/live/sites/shared_arkema/files/downloads/fluorochemicals/forane-404a-thermodynamic-properties-si.pdf

Limitations

Before you use these numbers

  • ▸CoolProp multi-fluid Helmholtz-energy mixture model for the predefined blend R-404A (44/52/4 wt% R-125/R-143a/R-134a). Saturation properties only, tabulated from -40 to +60 degC; superheated and single-phase data are out of scope for this page. R-404A is a zeotropic blend: at a given temperature its bubble-point pressure is higher than its dew-point pressure. The critical point is 72.12 degC / 3734.8 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. Temperature glide at 1 atm (101.325 kPa), computed as the dew-point temperature minus the bubble-point temperature at constant pressure is 0.75 K.
  • ▸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 72.12 °C / 3734.8 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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