In this publication you will find the characteristics of R448a refrigerant, pressure-temperature tables in degrees Celsius and Fahrenheit. We will also provide a Log(p)-h diagram for R448a freon, tell you about its scope of application and the prospects for its use.
Properties, characteristics of R448a freon
Below is a table of the main physical properties of freon R448a. Please note that some values are given in the range. This is due to the fact that R448a is a zeotropic mixture of gases, which have slightly different characteristics. Also, the difference in indicators may be due to different measurement methods.
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| Property | Value |
| Compound | R32/R125/ R134a / R1234yf /R1234ze |
| Type | HFC + HFO |
| Molecular weight | 86.28 g/mol |
| Boiling point (at 1 atmosphere) | -45.9°C |
| Dew point (at 1 atmosphere) | -39.9°C |
| Critical temperature | 82.7-83.7°C |
| Critical pressure | 46-46.6 bar |
| Critical volume | 0.00208 m3/kg |
| Critical density | 477.3-480.2 kg/m3 |
| Vapor density at boiling point | 4.701 kg/m3 |
| Density of liquid at 0°C | 1192.5 kg/m3 |
| Density of liquid at 25°C | 1092.3 kg/m3 |
| Vapor density at 25°C | 1.165 kg/m3 |
| Vapor pressure at 25°C | 1107.1 kPa |
| Viscosity of liquid at 25°C | 138.1 μPa-sec |
| Vapor viscosity at 25°C | 12.3 μPa-sec |
| Density of saturated liquid at 25°C | 1097.2 kg/m3 |
| Saturated steam density at 1.013 bar | 4.703 kg/m3 |
| Saturated liquid pressure at 25°C | 12,876 bar |
| Saturated liquid pressure at 50°C | 23,728 bar |
| Latent heat of vaporization at 1.013 bar | 241.5 kJ/kg |
| Thermal conductivity of liquid at 25°C | 81.2 mW/(m.K) |
| Thermal conductivity of steam at 25°C and 1.013 bar | 13.6 mW/(m.K) |
| Surface tension at 25°C | 5.96 mN/m |
| Specific heat capacity of liquid at 25°C | 1.555 kJ/(kg.K) |
| Specific heat of steam at 25°C and 1.013 bar | 0.8497 kJ/(kg.K) |
| Cp/Cv ratio at 25° and 1.013 bar | 1,141 |
| Lower flammability limit (LFL) in air (EN 378) | No |
| Flash point | No |
| Decomposition temperature | More than 250°C |
| Appearance | Colorless |
| ISO 817 / ASHRAE 34 Safety Classification | A1 |
| PED liquid group | 2 |
| Ozone Depletion Potential (ODP) | 0 |
| IPCC AR4 Global Warming Potential (GWP) | 1387 |
| IPCC AR5 Global Warming Potential (GWP) | 1273 |
Composition of freon R448a
The refrigerant R448a is a multicomponent gas. Due to this, it has a temperature glide. It consists of five freons in the following proportions:
- R32 — 26%.
- R125 — 26%.
- R134a — 21%.
- R1234yf — 20%.
- R1234ze — 7%.
R448a vs R404a
Since R448a was created as an alternative to R404a, it makes sense to compare them. In the table below, we have listed the main performance characteristics of these gases.
| Property | R-404A | R-448A |
| Global Warming Potential (GWP) | 3750 | 1273 |
| Ozone Depletion Potential (ODP) | 0 | 0 |
| Flammability | Low flammability (A2L) | Non-flammable (A1) |
| Price | Cheaper | More expensive |
| Efficiency | Norm | 5-10% more efficient |
| Capacity | Norm | A little more |
Suction density for R404A and R448A.
Application of refrigerant R448a
R448a was originally developed to replace the outdated R404a with a high global warming potential. It can also be used as an alternative to R22 and R507. Provided the system is retrofitted, R-448a can be used to replace mixed freons that include R-22, such as:
- R-402A.
- R-402B.
- R-408A.
Currently, the refrigerant R448a is used mainly in the following direct evaporation systems:
- Commercial refrigeration.
- Industrial cooling.
- Industrial air conditioning.
The refrigerant R448a was developed as an alternative to freon R404a, R22 and some others. It is classified as a gas with medium global warming potential. According to the Montreal Protocol and related amendments and decisions, it can be used until 2030 in the European Union in old equipment and until 2025 in new equipment.
In the US and Canada, R448a can be used until 2025-2040 (depending on the decision of the state, province, territory or federal government). In other countries, the situation is individual and decisions are made locally.
R448A Temperature Pressure Table in Degrees Celsius
Below is a table of pressure versus temperature for R448a refrigerant. Temperature is in degrees Celsius, pressure is measured in bar. Note that the pressure is in gauge, not absolute. To find out the absolute pressure, add one to the pressure value.
| T,C | Liquid | Vapor | T,C | Liquid | Vapor |
| -70 | -0.76 | -0.84 | 2 | 5.29 | 4.21 |
| -68 | -0.73 | -0.82 | 4 | 5.7 | 4.57 |
| -66 | -0.69 | -0.79 | 6 | 6.13 | 4.95 |
| -64 | -0.65 | -0.76 | 8 | 6.58 | 5.34 |
| -62 | -0.6 | -0.73 | 10 | 7.05 | 5.76 |
| -60 | -0.55 | -0.69 | 12 | 7.54 | 6.2 |
| -58 | -0.5 | -0.65 | 14 | 8.05 | 6.66 |
| -56 | -0.44 | -0.61 | 16 | 8.58 | 7.14 |
| -54 | -0.38 | -0.56 | 18 | 9.14 | 7.64 |
| -52 | -0.3 | -0.5 | 20 | 9.72 | 8.17 |
| -50 | -0.23 | -0.44 | 22 | 10.33 | 8.72 |
| -48 | -0.14 | -0.38 | 24 | 10.96 | 9.29 |
| -46 | -0.05 | -0.31 | 26 | 11.62 | 9.9 |
| -44 | 0.04 | -0.23 | 28 | 12.3 | 10.52 |
| -42 | 0.15 | -0.15 | 30 | 13.01 | 11.18 |
| -40 | 0.26 | -0.06 | 32 | 13.74 | 11.86 |
| -38 | 0.38 | 0.04 | 34 | 14.51 | 12.57 |
| -36 | 0.51 | 0.14 | 36 | 15.3 | 13.31 |
| -34 | 0.65 | 0.26 | 38 | 16.13 | 14.08 |
| -32 | 0.8 | 0.38 | 40 | 16.98 | 14.88 |
| -30 | 0.96 | 0.51 | 42 | 17.86 | 15.72 |
| -28 | 1.13 | 0.65 | 44 | 18.78 | 16.59 |
| -26 | 1.31 | 0.8 | 46 | 19.73 | 17.49 |
| -24 | 1.5 | 0.96 | 48 | 20.71 | 18.43 |
| -22 | 1.71 | 1.13 | 50 | 21.72 | 19.41 |
| -20 | 1.92 | 1.31 | 52 | 22.77 | 20.42 |
| -18 | 2.15 | 1.5 | 54 | 23.85 | 21.47 |
| -16 | 2.4 | 1.71 | 56 | 24.97 | 22.57 |
| -14 | 2.66 | 1.93 | 58 | 26.13 | 23.7 |
| -12 | 2.93 | 2.16 | 60 | 27.32 | 24.88 |
| -10 | 3.22 | 2.41 | 62 | 28.55 | 26.1 |
| -8 | 3.52 | 2.67 | 64 | 29.82 | 27.38 |
| -6 | 3.84 | 2.94 | 66 | 31.13 | 28.7 |
| -4 | 4.18 | 3.24 | 68 | 32.48 | 30.07 |
| -2 | 4.53 | 3.54 | 70 | 33.87 | 31.51 |
| 0 | 4.9 | 3.87 | — | — | — |
R448A Temperature Pressure Table in Fahrenheit
Below is a table of pressure versus temperature for R448a refrigerant. Pressure is in pounds per square inch, temperature in degrees Fahrenheit. Please note that the table shows excess pressure. To find out the absolute pressure, add 14.7 to the value shown.
| T,F | Liquid | Vapor | T,F | Liquid | Vapor |
| -94 | -11.03 | -12.25 | 35.6 | 76.71 | 61.02 |
| -90.4 | -10.54 | -11.89 | 39.2 | 82.64 | 66.24 |
| -86.8 | -10 | -11.5 | 42.8 | 88,85 | 71,72 |
| -83.2 | -9.4 | -11.06 | 46.4 | 95.35 | 77.48 |
| -79.6 | -8.75 | -10.58 | 50 | 102.15 | 83.53 |
| -76 | -8.03 | -10.04 | 53.6 | 109.26 | 89,88 |
| -72.4 | -7.24 | -9.45 | 57.2 | 116.69 | 96.53 |
| -68.8 | -6.38 | -8.8 | 60.8 | 124.44 | 103.5 |
| -65.2 | -5.44 | -8.08 | 64.4 | 132.53 | 110.8 |
| -61.6 | -4.42 | -7.29 | 68 | 140.97 | 118.44 |
| -58 | -3.3 | -6.43 | 71.6 | 149.76 | 126.42 |
| -54.4 | -2.1 | -5.5 | 75.2 | 158.89 | 134.76 |
| -50.8 | -0.8 | -4.48 | 78.8 | 168.42 | 143.48 |
| -47.2 | 0.61 | -3.37 | 82.4 | 178.31 | 152.57 |
| -43.6 | 2.13 | -2.16 | 86 | 188.59 | 162.07 |
| -40 | 3.77 | -0.86 | 89.6 | 199.27 | 171.96 |
| -36.4 | 5.52 | 0.55 | 93.2 | 210.37 | 182.27 |
| -32.8 | 7.41 | 2.07 | 96.8 | 221.88 | 193.01 |
| -29.2 | 9.43 | 3.71 | 100.4 | 233.81 | 204.19 |
| -25.6 | 11.59 | 5.47 | 104 | 246.18 | 215.82 |
| -22 | 13.9 | 7.36 | 107.6 | 259 | 227.94 |
| -18.4 | 16.36 | 9.38 | 111.2 | 272.27 | 240.53 |
| -14.8 | 18.99 | 11.55 | 114.8 | 286.01 | 253.62 |
| -11.2 | 21.78 | 13.87 | 118.4 | 300.24 | 267.24 |
| -7.6 | 24.75 | 16.35 | 122 | 314.94 | 281.37 |
| -4 | 27.9 | 18.99 | 125.6 | 330.14 | 296.08 |
| -0.4 | 31.24 | 21.8 | 129.2 | 345.85 | 311.33 |
| 3.2 | 34.77 | 24.79 | 132.8 | 362.08 | 327.19 |
| 6.8 | 38.51 | 27.97 | 136.4 | 378.86 | 343.65 |
| 10.4 | 42,47 | 31,34 | 140 | 396.15 | 360.75 |
| 14 | 46.64 | 34.91 | 143.6 | 414 | 378.51 |
| 17.6 | 51.04 | 38.69 | 147.2 | 432,43 | 396.97 |
| 21.2 | 55.67 | 42.69 | 150.8 | 451.43 | 416.14 |
| 24.8 | 60.55 | 46.91 | 154.4 | 471 | 436.07 |
| 28.4 | 65,67 | 51.37 | 158 | 491.16 | 456.82 |
| 32 | 71.06 | 56.07 | — | — | — |
Log(p)-h diagram for R448a freon (Mollier diagram)
On the Freons.Info website you will find more information about other refrigerants.