R-452A PT Chart
A1 GWP 2141Zeotropic blend (R-32/R-125/R-1234yf, 11.0/59.0/30.0%). HFO/HFC Blend.
About R-452A
R-452A (Opteon XP44) was developed for transport refrigeration (reefer trucks, trailers and containers), where it matches R-404A's capacity and discharge temperature more closely than other replacements. Its glide is about 7°F, smaller than R-448A/R-449A but still enough that the liquid and vapor columns differ noticeably.
Saturation pressures at typical operating points, taken from the table below:
- Freezer evaporator (−20°F): 18.2 PSIG liquid / 13.0 PSIG vapor
- Medium-temp evaporator (20°F): 60.1 PSIG liquid / 50.1 PSIG vapor
- Condensing (105°F): 266.6 PSIG liquid / 242.9 PSIG vapor
The table covers -80°F to 165°F in 5°F steps. Below about -53°F the liquid saturation pressure is below atmospheric, so gauges read in vacuum (shown in blue in the table).
R-452A Pressure-Temperature Graph (Bubble & Dew)
R-452A Saturation Pressure Table
R-452A is a zeotropic blend with temperature glide, so it has two saturation pressures at each temperature. Use Vapor (dew) PSIG to find evaporator saturation for superheat, and Liquid (bubble) PSIG to find condenser saturation for subcooling. PSIA, kPa and bar columns are liquid (bubble) pressures. Blue values indicate vacuum.
| °F | °C | Liquid PSIG (bubble) |
Vapor PSIG (dew) |
PSIA | kPa | bar |
|---|---|---|---|---|---|---|
| -80 | -62.2 | -7.92 | -9.3 | 6.77 | 46.7 | 0.467 |
| -75 | -59.4 | -6.82 | -8.4 | 7.87 | 54.3 | 0.543 |
| -70 | -56.7 | -5.58 | -7.4 | 9.12 | 62.8 | 0.628 |
| -65 | -53.9 | -4.18 | -6.2 | 10.52 | 72.5 | 0.725 |
| -60 | -51.1 | -2.61 | -4.9 | 12.09 | 83.3 | 0.833 |
| -55 | -48.3 | -0.85 | -3.4 | 13.85 | 95.5 | 0.955 |
| -50 | -45.6 | 1.11 | -1.7 | 15.81 | 109.0 | 1.09 |
| -45 | -42.8 | 3.3 | 0.1 | 17.99 | 124.1 | 1.241 |
| -40 | -40.0 | 5.7 | 2.2 | 20.4 | 140.6 | 1.406 |
| -35 | -37.2 | 8.4 | 4.5 | 23.1 | 159.2 | 1.592 |
| -30 | -34.4 | 11.4 | 7.1 | 26.1 | 179.9 | 1.799 |
| -25 | -31.7 | 14.7 | 10.0 | 29.4 | 202.7 | 2.027 |
| -20 | -28.9 | 18.2 | 13.0 | 32.9 | 226.8 | 2.268 |
| -15 | -26.1 | 22.1 | 16.4 | 36.8 | 253.7 | 2.537 |
| -10 | -23.3 | 26.4 | 20.2 | 41.1 | 283.3 | 2.833 |
| -5 | -20.6 | 31.0 | 24.2 | 45.7 | 315.1 | 3.151 |
| 0 | -17.8 | 35.9 | 28.6 | 50.6 | 348.8 | 3.488 |
| 5 | -15.0 | 41.3 | 33.3 | 56.0 | 386.1 | 3.861 |
| 10 | -12.2 | 47.1 | 38.5 | 61.8 | 426.1 | 4.261 |
| 15 | -9.4 | 53.4 | 44.1 | 68.1 | 469.5 | 4.695 |
| 20 | -6.7 | 60.1 | 50.1 | 74.8 | 515.7 | 5.157 |
| 25 | -3.9 | 67.3 | 56.6 | 82.0 | 565.3 | 5.653 |
| 30 | -1.1 | 75.0 | 63.6 | 89.7 | 618.4 | 6.184 |
| 35 | 1.7 | 83.2 | 71.0 | 97.9 | 675.0 | 6.75 |
| 40 | 4.4 | 92.0 | 79.0 | 106.7 | 735.6 | 7.356 |
| 45 | 7.2 | 101.3 | 87.5 | 116.0 | 799.8 | 7.998 |
| 50 | 10.0 | 111.2 | 96.6 | 125.9 | 868.0 | 8.68 |
| 55 | 12.8 | 121.8 | 106.3 | 136.5 | 941.1 | 9.411 |
| 60 | 15.6 | 133.0 | 116.7 | 147.7 | 1018.3 | 10.183 |
| 65 | 18.3 | 144.8 | 127.6 | 159.5 | 1099.7 | 10.997 |
| 70 | 21.1 | 157.4 | 139.3 | 172.1 | 1186.6 | 11.866 |
| 75 | 23.9 | 170.7 | 151.8 | 185.4 | 1278.3 | 12.783 |
| 80 | 26.7 | 184.6 | 164.8 | 199.3 | 1374.1 | 13.741 |
| 85 | 29.4 | 199.4 | 178.8 | 214.1 | 1476.1 | 14.761 |
| 90 | 32.2 | 214.9 | 193.5 | 229.6 | 1583.0 | 15.83 |
| 95 | 35.0 | 231.3 | 209.1 | 246.0 | 1696.1 | 16.961 |
| 100 | 37.8 | 248.5 | 225.5 | 263.2 | 1814.7 | 18.147 |
| 105 | 40.6 | 266.6 | 242.9 | 281.3 | 1939.5 | 19.395 |
| 110 | 43.3 | 285.5 | 261.2 | 300.2 | 2069.8 | 20.698 |
| 115 | 46.1 | 305.4 | 280.5 | 320.1 | 2207.0 | 22.07 |
| 120 | 48.9 | 326.2 | 300.9 | 340.9 | 2350.4 | 23.504 |
| 125 | 51.7 | 348.0 | 322.4 | 362.7 | 2500.7 | 25.007 |
| 130 | 54.4 | 370.8 | 345.0 | 385.5 | 2657.9 | 26.579 |
| 135 | 57.2 | 394.6 | 368.9 | 409.3 | 2822.0 | 28.22 |
| 140 | 60.0 | 419.5 | 394.0 | 434.2 | 2993.7 | 29.937 |
| 145 | 62.8 | 445.5 | 421.4 | 460.2 | 3172.9 | 31.729 |
| 150 | 65.6 | 472.6 | 448.9 | 487.3 | 3359.8 | 33.598 |
| 155 | 68.3 | 500.2 | 478.3 | 514.9 | 3549.9 | 35.499 |
| 160 | 71.1 | 527.9 | — | 542.6 | 3741.0 | 37.41 |
| 165 | 73.9 | 555.7 | — | 570.4 | 3932.6 | 39.326 |
Properties
| ASHRAE Designation | 452A |
| Safety Classification | A1 (non-flammable, low toxicity) |
| GWP (AR4, 100-yr) | 2141 |
| ODP | 0 |
| Molecular Weight | 103.5 g/mol |
| Boiling Point (1 atm) | -52.6°F / -47.0°C |
| Critical Temperature | 166.8°F / 74.9°C |
| Critical Pressure | 580.4 psia / 40.02 bar |
| Category | HFO/HFC Blend |
Common Applications
- Transport refrigeration (reefer trucks, trailers, marine/rail containers)
- Low- and medium-temperature commercial and industrial DX refrigeration
- Retrofit replacement for R-404A/R-507A
Frequently Asked Questions
Is R-452A a drop-in replacement for R-404A?
R-452A (Opteon XP44) is best described as a high-performance retrofit for R-404A/R-507A rather than a literal drop-in. It has roughly 7°F of temperature glide, so like other HFO/HFC blends it must be charged as a liquid, and technicians should check elastomers, filter-driers, and lubricant per manufacturer retrofit guidelines. Its pressures, discharge temperature, and mass flow closely match R-404A, so many systems can convert with minimal component changes.
What is the R-452A pressure at 70°F?
At 70°F (21.1°C), R-452A's saturated liquid pressure is about 157.4 PSIG (172.1 PSIA). That's slightly higher than R-449A (151.0 PSIG at 70°F), consistent with R-452A running a bit higher pressure than other R-404A replacement blends.
What brand name is R-452A sold under, and where is it used?
R-452A is sold by Chemours under the brand name Opteon XP44. It was purpose-built for transport refrigeration — reefer trucks, trailers, and marine/rail shipping containers — and is also used in low- and medium-temperature commercial and industrial refrigeration as a lower-GWP replacement for R-404A and R-507A.