PT chart · ASHRAE A1
R-448A PT Chart
R-448A pressure–temperature chart in psig and °F/°C. Low and medium-temp refrigeration (R-404A replacement).
R-448A is a zeotropic blend with temperature glide, so the chart has two columns: use the vapor (dew) column for superheat and the liquid (bubble) column for subcooling.
Vacuum readings are shown in inches of mercury (″ Hg) below atmospheric pressure.
| °F | °C | Liquid (bubble), psig | Vapor (dew), psig |
|---|---|---|---|
| -40 | -40.0 | 4.9 | 0.0 |
| -35 | -37.2 | 7.5 | 2.1 |
| -30 | -34.4 | 10.4 | 4.4 |
| -25 | -31.7 | 13.5 | 7.0 |
| -20 | -28.9 | 17.0 | 9.8 |
| -15 | -26.1 | 20.8 | 13.0 |
| -10 | -23.3 | 24.9 | 16.4 |
| -5 | -20.6 | 29.4 | 20.2 |
| 0 | -17.8 | 34.2 | 24.3 |
| 5 | -15.0 | 39.4 | 28.8 |
| 10 | -12.2 | 45.1 | 33.6 |
| 15 | -9.4 | 51.2 | 38.9 |
| 20 | -6.7 | 57.8 | 44.6 |
| 25 | -3.9 | 64.8 | 50.7 |
| 30 | -1.1 | 72.3 | 57.3 |
| 35 | 1.7 | 80.4 | 64.4 |
| 40 | 4.4 | 89.0 | 72.1 |
| 45 | 7.2 | 98.2 | 80.3 |
| 50 | 10.0 | 108.0 | 89.0 |
| 55 | 12.8 | 118.4 | 98.4 |
| 60 | 15.6 | 129.4 | 108.4 |
| 65 | 18.3 | 141.1 | 119.0 |
| 70 | 21.1 | 153.5 | 130.3 |
| 75 | 23.9 | 166.6 | 142.4 |
| 80 | 26.7 | 180.5 | 155.1 |
| 85 | 29.4 | 195.1 | 168.7 |
| 90 | 32.2 | 210.5 | 183.0 |
| 95 | 35.0 | 226.7 | 198.2 |
| 100 | 37.8 | 243.7 | 214.3 |
| 105 | 40.6 | 261.7 | 231.3 |
| 110 | 43.3 | 280.5 | 249.2 |
| 115 | 46.1 | 300.2 | 268.1 |
| 120 | 48.9 | 320.9 | 288.1 |
| 125 | 51.7 | 342.6 | 309.1 |
| 130 | 54.4 | 365.3 | 331.3 |
| 135 | 57.2 | 389.0 | 354.7 |
| 140 | 60.0 | 413.8 | 379.3 |
| 145 | 62.8 | 439.7 | 405.3 |
| 150 | 65.6 | 466.7 | 432.6 |
Source: Arkema Forane® Pressure Temperature Chart (PPC/SDC 05-2025). Reference only; verify against the equipment manufacturer's data.
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