R-513A PT Chart
A1 GWP 631Zeotropic blend (R-1234yf/R-134a, 56.0/44.0%). HFO/HFC Blend.
About R-513A
R-513A is a near-azeotropic blend of R-1234yf and R-134a built as a retrofit and new-equipment replacement for R-134a in chillers and medium-temperature refrigeration. It is non-flammable (A1), runs slightly higher pressure than R-134a, and has negligible glide, so one pressure column is enough.
Saturation pressures at typical operating points, taken from the table below:
- Chiller evaporator (40°F): 39.6 PSIG
- Condensing (100°F): 132.0 PSIG
The table covers -55°F to 205°F in 5°F steps. Below about -20°F the saturation pressure is below atmospheric, so gauges read in vacuum (shown in blue in the table).
R-513A Pressure-Temperature Graph
R-513A Saturation Pressure Table
Blue values indicate vacuum (below atmospheric pressure).
| °F | °C | PSIG | PSIA | kPa | bar |
|---|---|---|---|---|---|
| -55 | -48.3 | -9.0 | 5.7 | 39.3 | 0.39 |
| -50 | -45.6 | -8.1 | 6.6 | 45.5 | 0.45 |
| -45 | -42.8 | -7.0 | 7.7 | 53.1 | 0.53 |
| -40 | -40.0 | -5.9 | 8.8 | 60.6 | 0.61 |
| -35 | -37.2 | -4.6 | 10.1 | 69.6 | 0.7 |
| -30 | -34.4 | -3.2 | 11.5 | 79.3 | 0.79 |
| -25 | -31.7 | -1.6 | 13.1 | 90.3 | 0.9 |
| -20 | -28.9 | 0.1 | 14.8 | 102.0 | 1.02 |
| -15 | -26.1 | 2.1 | 16.8 | 115.8 | 1.16 |
| -10 | -23.3 | 4.2 | 18.9 | 130.3 | 1.3 |
| -5 | -20.6 | 6.6 | 21.3 | 146.8 | 1.47 |
| 0 | -17.8 | 9.1 | 23.8 | 164.1 | 1.64 |
| 5 | -15.0 | 11.9 | 26.6 | 183.4 | 1.83 |
| 10 | -12.2 | 15.0 | 29.7 | 204.7 | 2.05 |
| 15 | -9.4 | 18.3 | 33.0 | 227.5 | 2.27 |
| 20 | -6.7 | 21.9 | 36.6 | 252.3 | 2.52 |
| 25 | -3.9 | 25.9 | 40.6 | 279.9 | 2.8 |
| 30 | -1.1 | 30.1 | 44.8 | 308.9 | 3.09 |
| 35 | 1.7 | 34.6 | 49.3 | 339.9 | 3.4 |
| 40 | 4.4 | 39.6 | 54.3 | 374.4 | 3.74 |
| 45 | 7.2 | 44.8 | 59.5 | 410.2 | 4.1 |
| 50 | 10.0 | 50.5 | 65.2 | 449.5 | 4.5 |
| 55 | 12.8 | 56.5 | 71.2 | 490.9 | 4.91 |
| 60 | 15.6 | 63.0 | 77.7 | 535.7 | 5.36 |
| 65 | 18.3 | 69.9 | 84.6 | 583.3 | 5.83 |
| 70 | 21.1 | 77.3 | 92.0 | 634.3 | 6.34 |
| 75 | 23.9 | 85.1 | 99.8 | 688.1 | 6.88 |
| 80 | 26.7 | 93.4 | 108.1 | 745.3 | 7.45 |
| 85 | 29.4 | 102.0 | 116.7 | 804.6 | 8.05 |
| 90 | 32.2 | 112.0 | 126.7 | 873.5 | 8.74 |
| 95 | 35.0 | 121.0 | 135.7 | 935.6 | 9.36 |
| 100 | 37.8 | 132.0 | 146.7 | 1011.4 | 10.11 |
| 105 | 40.6 | 143.0 | 157.7 | 1087.3 | 10.87 |
| 110 | 43.3 | 155.0 | 169.7 | 1170.0 | 11.7 |
| 115 | 46.1 | 167.0 | 181.7 | 1252.7 | 12.53 |
| 120 | 48.9 | 180.0 | 194.7 | 1342.4 | 13.42 |
| 125 | 51.7 | 193.0 | 207.7 | 1432.0 | 14.32 |
| 130 | 54.4 | 207.0 | 221.7 | 1528.5 | 15.29 |
| 135 | 57.2 | 222.0 | 236.7 | 1632.0 | 16.32 |
| 140 | 60.0 | 238.0 | 252.7 | 1742.3 | 17.42 |
| 145 | 62.8 | 254.0 | 268.7 | 1852.6 | 18.53 |
| 150 | 65.6 | 271.0 | 285.7 | 1969.8 | 19.7 |
| 155 | 68.3 | 289.7 | 304.4 | 2098.7 | 20.99 |
| 160 | 71.1 | 308.7 | 323.4 | 2229.9 | 22.3 |
| 165 | 73.9 | 328.7 | 343.4 | 2367.4 | 23.67 |
| 170 | 76.7 | 349.5 | 364.2 | 2511.1 | 25.11 |
| 175 | 79.4 | 371.4 | 386.1 | 2661.9 | 26.62 |
| 180 | 82.2 | 394.2 | 408.9 | 2819.4 | 28.19 |
| 185 | 85.0 | 418.2 | 432.9 | 2985.0 | 29.85 |
| 190 | 87.8 | 443.3 | 458.0 | 3158.0 | 31.58 |
| 195 | 90.6 | 469.8 | 484.5 | 3340.3 | 33.4 |
| 200 | 93.3 | 497.5 | 512.2 | 3531.3 | 35.31 |
| 205 | 96.1 | 527.0 | 541.7 | 3734.9 | 37.35 |
Properties
| ASHRAE Designation | 513A |
| Safety Classification | A1 (non-flammable, low toxicity) |
| GWP (AR4, 100-yr) | 631 |
| ODP | 0 |
| Molecular Weight | 108.4 g/mol |
| Boiling Point (1 atm) | -20.6°F / -29.2°C |
| Critical Temperature | 205.7°F / 96.5°C |
| Critical Pressure | 546.2 psia / 37.66 bar |
| Category | HFO/HFC Blend |
Common Applications
- Centrifugal and screw chillers (direct R-134a replacement)
- Commercial and industrial refrigeration at medium/high temperature
- Data center and building comfort-cooling chiller systems
Frequently Asked Questions
Is R-513A a drop-in replacement for R-134a?
R-513A is widely marketed as a very close, near-drop-in replacement for R-134a, especially in centrifugal chillers, because it runs at nearly identical saturation pressures with almost no temperature glide (it behaves like an azeotrope in practice). It is not chemically identical, however, so technicians should still confirm OEM approval, lubricant compatibility (POE oils are typically retained), and elastomer/seal compatibility before retrofitting an existing R-134a system.
What pressure does R-513A run at 70°F?
At 70°F, R-513A saturates at about 77.3 PSIG (92.0 PSIA), which is slightly higher than R-134a's roughly 71-72 PSIG at the same temperature. This modest pressure increase is a direct result of blending in the higher-vapor-pressure HFO-1234yf component, but it stays close enough to R-134a's curve that existing gauges, controls, and safety relief settings generally remain valid.
What brand names is R-513A sold under, and where is it used?
R-513A is sold by Chemours as Opteon XP10 and by Honeywell as Solstice 513A. It is used mainly in centrifugal and screw chillers, direct-expansion water chillers, and medium-to-high-temperature commercial refrigeration as a lower-GWP (631 vs. R-134a's 1,430) replacement in new equipment and retrofits for buildings, data centers, and district cooling plants.