Bubble point
At a given pressure, the temperature where liquid refrigerant begins boiling into vapor.
Refrigerant service reference
R-454C Pressure–Temperature (P–T) Chart
Bubble and dew saturation temperatures, temperature glide, and phase region by pressure.
R-454C · Opteon™ XL20
R-32 / R-1234yf · 21.5 / 78.5 wt%
A2L refrigerant
Evaporating / suction reference
Low side
Condensing / high-pressure reference
High side
How to read each bar
Phase key
Dew point
At a given pressure, the temperature where refrigerant vapor begins condensing into liquid.
All liquidColder than the bubble point
Two-phase regionLiquid-rich → vapor-rich, illustrative
All vaporWarmer than the dew point
Service math: use dew saturation for superheat and bubble saturation for subcooling.
Important: the color/dot blend is a visual cue, not calculated vapor quality. Real coils also have pressure drop and changing composition.
Field reference + refrigerant context
Use R-454C bubble, dew, and glide deliberately
R-454C is a zeotropic A2L blend, so its saturation temperature changes through the two-phase region. This chart helps service professionals keep bubble point, dew point, and temperature glide visible while checking evaporating and condensing pressures.
R-454C published P–T source points 37 temperatures · bubble and dew pressure
These Chemours Opteon™ XL20 points anchor the chart’s linear interpolation. Pressures are shown in PSI.
| Temperature | Temperature | Bubble pressure | Dew pressure |
|---|---|---|---|
| -40°F | -40.0°C | 4.3 PSI | -1.5 PSI |
| -35°F | -37.2°C | 6.8 PSI | 0.4 PSI |
| -30°F | -34.4°C | 9.5 PSI | 2.4 PSI |
| -25°F | -31.7°C | 12.4 PSI | 4.7 PSI |
| -20°F | -28.9°C | 15.7 PSI | 7.2 PSI |
| -15°F | -26.1°C | 19.2 PSI | 10.0 PSI |
| -10°F | -23.3°C | 23.1 PSI | 13.0 PSI |
| -5°F | -20.6°C | 27.3 PSI | 16.3 PSI |
| 0°F | -17.8°C | 31.8 PSI | 19.9 PSI |
| 5°F | -15.0°C | 36.7 PSI | 23.8 PSI |
| 10°F | -12.2°C | 41.9 PSI | 28.0 PSI |
| 15°F | -9.4°C | 47.6 PSI | 32.6 PSI |
| 20°F | -6.7°C | 53.6 PSI | 37.6 PSI |
| 25°F | -3.9°C | 60.1 PSI | 42.9 PSI |
| 30°F | -1.1°C | 67.1 PSI | 48.7 PSI |
| 35°F | 1.7°C | 74.5 PSI | 54.9 PSI |
| 40°F | 4.4°C | 82.4 PSI | 61.5 PSI |
| 45°F | 7.2°C | 90.8 PSI | 68.6 PSI |
| 50°F | 10.0°C | 99.7 PSI | 76.3 PSI |
| 55°F | 12.8°C | 109.2 PSI | 84.4 PSI |
| 60°F | 15.6°C | 119.3 PSI | 93.1 PSI |
| 65°F | 18.3°C | 129.9 PSI | 102.3 PSI |
| 70°F | 21.1°C | 141.2 PSI | 112.2 PSI |
| 75°F | 23.9°C | 153.0 PSI | 122.6 PSI |
| 80°F | 26.7°C | 165.6 PSI | 133.7 PSI |
| 85°F | 29.4°C | 178.8 PSI | 145.5 PSI |
| 90°F | 32.2°C | 192.6 PSI | 158.0 PSI |
| 95°F | 35.0°C | 207.2 PSI | 171.2 PSI |
| 100°F | 37.8°C | 222.5 PSI | 185.2 PSI |
| 105°F | 40.6°C | 238.6 PSI | 199.9 PSI |
| 110°F | 43.3°C | 255.5 PSI | 215.5 PSI |
| 115°F | 46.1°C | 273.1 PSI | 232.0 PSI |
| 120°F | 48.9°C | 291.6 PSI | 249.3 PSI |
| 125°F | 51.7°C | 310.8 PSI | 267.7 PSI |
| 130°F | 54.4°C | 331.0 PSI | 287.0 PSI |
| 135°F | 57.2°C | 352.0 PSI | 307.4 PSI |
| 140°F | 60.0°C | 373.9 PSI | 328.8 PSI |