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Use the interactive PT chart with calculator →R-134a Pressure Temperature Chart
Saturation pressure (PSIG) for R-134a at temperatures from -40°F to 120°F. The standard for automotive AC and medium-temp refrigeration.
| Temp (°F) | Pressure (PSIG) |
|---|---|
| -40°F | -6.8 vac |
| -20°F | 2.4 |
| 0°F | 14.7 |
| 20°F | 30.1 |
| 40°F | 49.7 |
| 60°F | 74.3 |
| 80°F | 104.3 |
| 100°F | 140.7 |
| 120°F | 184.3 |
Frequently Asked Questions
What is the saturation pressure of R-134a at 75°F?
At 75°F, R-134a has a saturation pressure of approximately 96.8 PSIG (interpolated between 74.3 PSIG at 60°F and 104.3 PSIG at 80°F).
What is R-134a used for?
R-134a (1,1,1,2-tetrafluoroethane) is widely used in automotive air conditioning, medium-temperature commercial refrigeration, and chillers. It replaced R-12 in automotive applications.
At what temperature does R-134a go into vacuum?
R-134a drops below 0 PSIG (into vacuum) at temperatures below approximately -15°F. At -40°F, R-134a reads -6.8 PSIG (vacuum). This is important to note when diagnosing low-temperature systems.