R-452B
Ternary HFC/HFO blend (67% R-32 / 26% R-1234yf / 7% R-125). Branded as Chemours Opteon XL55 and Honeywell Solstice 452B. ASHRAE A2L, GWP 698 — engineered as a near-drop-in replacement for R-410A in residential and light commercial AC with operating pressures within ~5% across the envelope.
Lower toxicity. Flame propagates in air at 60°C, but with a low burning velocity (≤ 10 cm/s) and a heat of combustion < 19,000 kJ/kg. Requires A2L-rated equipment, leak detection, and charge limits per UL 60335-2-40 and ASHRAE 15. R-32, R-454B, R-1234yf, R-1234ze(E), R-452B, R-454C, R-455A, R-516A are A2L.
- Flammability
- Low (burning velocity ≤ 10 cm/s)
- Toxicity
- Lower (OEL ≥ 400 ppm)
Classification per ANSI/ASHRAE Standard 34-2022. See full reference.
Saturation pressure-temperature curve
Saturation values from CoolProp 7.2.0 HEOS::R32[0.81813]&R1234yf[0.14484]&R125[0.03704]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.
R-452B PT chart PDF — printable saturation table
Looking for the R-452B PT chart PDF for shop reference? The complete pressure-temperature saturation table is below — every 1° increment from −40°F to 150°F (or to the refrigerant's critical temperature). Use the Print / Save as PDF button in the table header to download a clean, table-only PDF (the rest of the page is hidden from the print output). Important service temperatures (normal boiling point, freezing point of water, residential AC evap and condenser targets) are tinted and tagged in the table for at-a-glance shop reference.
R-452B PT Chart — Pressure-Temperature Saturation Table
1° increments · Source: CoolProp 7.2.0 / manufacturer datasheet · hvacptcharts.com
| Temp (°F) | Bubble (PSIG) | Dew (PSIG) | Glide (PSI) |
|---|---|---|---|
| -40°F | 9.7 | 8.8 | 1.0 |
| -39°F | 10.4 | 9.3 | 1.0 |
| -38°F | 11.0 | 9.9 | 1.1 |
| -37°F | 11.6 | 10.6 | 1.1 |
| -36°F | 12.3 | 11.2 | 1.1 |
| -35°F | 13.0 | 11.8 | 1.1 |
| -34°F | 13.7 | 12.5 | 1.1 |
| -33°F | 14.3 | 13.2 | 1.2 |
| -32°F | 15.1 | 13.9 | 1.2 |
| -31°F | 15.8 | 14.6 | 1.2 |
| -30°F | 16.5 | 15.3 | 1.2 |
| -29°F | 17.3 | 16.0 | 1.3 |
| -28°F | 18.0 | 16.7 | 1.3 |
| -27°F | 18.8 | 17.5 | 1.3 |
| -26°F | 19.6 | 18.2 | 1.4 |
| -25°F | 20.4 | 19.0 | 1.4 |
| -24°F | 21.2 | 19.8 | 1.4 |
| -23°F | 22.1 | 20.6 | 1.4 |
| -22°F | 22.9 | 21.4 | 1.5 |
| -21°F | 23.8 | 22.3 | 1.5 |
| -20°F | 24.7 | 23.1 | 1.5 |
| -19°F | 25.6 | 24.0 | 1.6 |
| -18°F | 26.5 | 24.9 | 1.6 |
| -17°F | 27.4 | 25.8 | 1.6 |
| -16°F | 28.4 | 26.7 | 1.7 |
| -15°F | 29.3 | 27.6 | 1.7 |
| -14°F | 30.3 | 28.5 | 1.8 |
| -13°F | 31.3 | 29.5 | 1.8 |
| -12°F | 32.3 | 30.5 | 1.8 |
| -11°F | 33.3 | 31.5 | 1.9 |
| -10°F | 34.4 | 32.5 | 1.9 |
| -9°F | 35.4 | 33.5 | 1.9 |
| -8°F | 36.5 | 34.5 | 2.0 |
| -7°F | 37.6 | 35.6 | 2.0 |
| -6°F | 38.7 | 36.7 | 2.0 |
| -5°F | 39.9 | 37.8 | 2.1 |
| -4°F | 41.0 | 38.9 | 2.1 |
| -3°F | 42.2 | 40.0 | 2.2 |
| -2°F | 43.4 | 41.2 | 2.2 |
| -1°F | 44.6 | 42.4 | 2.2 |
| 0°F | 45.8 | 43.5 | 2.3 |
| 1°F | 47.1 | 44.8 | 2.3 |
| 2°F | 48.3 | 46.0 | 2.4 |
| 3°F | 49.6 | 47.2 | 2.4 |
| 4°F | 50.9 | 48.5 | 2.5 |
| 5°F | 52.3 | 49.8 | 2.5 |
| 6°F | 53.6 | 51.1 | 2.5 |
| 7°F | 55.0 | 52.4 | 2.6 |
| 8°F | 56.4 | 53.7 | 2.6 |
| 9°F | 57.8 | 55.1 | 2.7 |
| 10°F | 59.2 | 56.5 | 2.7 |
| 11°F | 60.7 | 57.9 | 2.8 |
| 12°F | 62.1 | 59.3 | 2.8 |
| 13°F | 63.6 | 60.8 | 2.9 |
| 14°F | 65.2 | 62.2 | 2.9 |
| 15°F | 66.7 | 63.7 | 3.0 |
| 16°F | 68.3 | 65.3 | 3.0 |
| 17°F | 69.9 | 66.8 | 3.1 |
| 18°F | 71.5 | 68.3 | 3.1 |
| 19°F | 73.1 | 69.9 | 3.2 |
| 20°F | 74.8 | 71.5 | 3.2 |
| 21°F | 76.4 | 73.2 | 3.3 |
| 22°F | 78.2 | 74.8 | 3.3 |
| 23°F | 79.9 | 76.5 | 3.4 |
| 24°F | 81.6 | 78.2 | 3.4 |
| 25°F | 83.4 | 79.9 | 3.5 |
| 26°F | 85.2 | 81.7 | 3.6 |
| 27°F | 87.0 | 83.4 | 3.6 |
| 28°F | 88.9 | 85.2 | 3.7 |
| 29°F | 90.8 | 87.0 | 3.7 |
| 30°F | 92.7 | 88.9 | 3.8 |
| 31°F | 94.6 | 90.8 | 3.8 |
| 32°FH₂O freeze | 96.5 | 92.6 | 3.9 |
| 33°F | 98.5 | 94.6 | 4.0 |
| 34°F | 100.5 | 96.5 | 4.0 |
| 35°F | 102.6 | 98.5 | 4.1 |
| 36°F | 104.6 | 100.5 | 4.2 |
| 37°F | 106.7 | 102.5 | 4.2 |
| 38°F | 108.8 | 104.6 | 4.3 |
| 39°F | 111.0 | 106.6 | 4.3 |
| 40°FAC evap target | 113.2 | 108.8 | 4.4 |
| 41°F | 115.4 | 110.9 | 4.5 |
| 42°F | 117.6 | 113.0 | 4.5 |
| 43°F | 119.8 | 115.2 | 4.6 |
| 44°F | 122.1 | 117.5 | 4.7 |
| 45°F | 124.4 | 119.7 | 4.7 |
| 46°F | 126.8 | 122.0 | 4.8 |
| 47°F | 129.2 | 124.3 | 4.9 |
| 48°F | 131.6 | 126.6 | 4.9 |
| 49°F | 134.0 | 129.0 | 5.0 |
| 50°F | 136.5 | 131.4 | 5.1 |
| 51°F | 138.9 | 133.8 | 5.1 |
| 52°F | 141.5 | 136.3 | 5.2 |
| 53°F | 144.0 | 138.8 | 5.3 |
| 54°F | 146.6 | 141.3 | 5.3 |
| 55°F | 149.2 | 143.8 | 5.4 |
| 56°F | 151.9 | 146.4 | 5.5 |
| 57°F | 154.6 | 149.0 | 5.6 |
| 58°F | 157.3 | 151.7 | 5.6 |
| 59°F | 160.0 | 154.3 | 5.7 |
| 60°F | 162.8 | 157.0 | 5.8 |
| 61°F | 165.6 | 159.8 | 5.8 |
| 62°F | 168.5 | 162.6 | 5.9 |
| 63°F | 171.3 | 165.3 | 6.0 |
| 64°F | 174.3 | 168.2 | 6.1 |
| 65°F | 177.2 | 171.1 | 6.1 |
| 66°F | 180.2 | 174.0 | 6.2 |
| 67°F | 183.2 | 176.9 | 6.3 |
| 68°F | 186.3 | 179.9 | 6.4 |
| 69°F | 189.3 | 182.9 | 6.4 |
| 70°FRoom T | 192.5 | 185.9 | 6.5 |
| 71°F | 195.6 | 189.0 | 6.6 |
| 72°F | 198.8 | 192.1 | 6.7 |
| 73°F | 202.0 | 195.3 | 6.7 |
| 74°F | 205.3 | 198.5 | 6.8 |
| 75°F | 208.6 | 201.7 | 6.9 |
| 76°F | 211.9 | 205.0 | 7.0 |
| 77°F | 215.3 | 208.3 | 7.0 |
| 78°F | 218.7 | 211.6 | 7.1 |
| 79°F | 222.2 | 215.0 | 7.2 |
| 80°F | 225.7 | 218.4 | 7.3 |
| 81°F | 229.2 | 221.8 | 7.3 |
| 82°F | 232.8 | 225.3 | 7.4 |
| 83°F | 236.4 | 228.9 | 7.5 |
| 84°F | 240.0 | 232.4 | 7.6 |
| 85°F | 243.7 | 236.0 | 7.7 |
| 86°F | 247.4 | 239.7 | 7.7 |
| 87°F | 251.2 | 243.4 | 7.8 |
| 88°F | 255.0 | 247.1 | 7.9 |
| 89°F | 258.8 | 250.9 | 8.0 |
| 90°F | 262.7 | 254.7 | 8.0 |
| 91°F | 266.6 | 258.5 | 8.1 |
| 92°F | 270.6 | 262.4 | 8.2 |
| 93°F | 274.6 | 266.4 | 8.3 |
| 94°F | 278.7 | 270.3 | 8.3 |
| 95°FAHRI design ambient | 282.8 | 274.3 | 8.4 |
| 96°F | 286.9 | 278.4 | 8.5 |
| 97°F | 291.1 | 282.5 | 8.6 |
| 98°F | 295.3 | 286.7 | 8.6 |
| 99°F | 299.6 | 290.9 | 8.7 |
| 100°F | 303.9 | 295.1 | 8.8 |
| 101°F | 308.2 | 299.4 | 8.8 |
| 102°F | 312.6 | 303.7 | 8.9 |
| 103°F | 317.1 | 308.1 | 9.0 |
| 104°F | 321.6 | 312.5 | 9.1 |
| 105°F | 326.1 | 317.0 | 9.1 |
| 106°F | 330.7 | 321.5 | 9.2 |
| 107°F | 335.3 | 326.0 | 9.3 |
| 108°F | 340.0 | 330.6 | 9.3 |
| 109°F | 344.7 | 335.3 | 9.4 |
| 110°FTypical cond saturation | 349.4 | 340.0 | 9.4 |
| 111°F | 354.3 | 344.8 | 9.5 |
| 112°F | 359.1 | 349.6 | 9.6 |
| 113°F | 364.0 | 354.4 | 9.6 |
| 114°F | 369.0 | 359.3 | 9.7 |
| 115°F | 374.0 | 364.3 | 9.7 |
| 116°F | 379.0 | 369.3 | 9.8 |
| 117°F | 384.1 | 374.3 | 9.8 |
| 118°F | 389.3 | 379.4 | 9.9 |
| 119°F | 394.5 | 384.6 | 9.9 |
| 120°F | 399.8 | 389.8 | 10.0 |
| 121°F | 405.1 | 395.0 | 10.1 |
| 122°F | 410.4 | 400.3 | 10.1 |
| 123°F | 415.8 | 405.7 | 10.1 |
| 124°F | 421.3 | 411.1 | 10.2 |
| 125°F | 426.8 | 416.6 | 10.2 |
| 126°F | 432.4 | 422.1 | 10.3 |
| 127°F | 438.0 | 427.7 | 10.3 |
| 146°F | 555.5 | 545.3 | 10.2 |
| 147°F | 562.3 | 552.2 | 10.2 |
| 148°F | 569.2 | 559.1 | 10.1 |
| 149°F | 576.1 | 566.1 | 10.0 |
| 150°F | 583.1 | 573.1 | 9.9 |
| Temp (°C) | Bubble (kPa) | Dew (kPa) | Glide (kPa) |
|---|---|---|---|
| -40°C | 67 | 60 | 7 |
| -39°C | 75 | 68 | 7 |
| -38°C | 83 | 76 | 7 |
| -37°C | 91 | 84 | 8 |
| -36°C | 100 | 92 | 8 |
| -35°C | 109 | 100 | 8 |
| -34°C | 118 | 109 | 9 |
| -33°C | 128 | 118 | 9 |
| -32°C | 137 | 128 | 9 |
| -31°C | 148 | 138 | 10 |
| -30°C | 158 | 148 | 10 |
| -29°C | 169 | 158 | 11 |
| -28°C | 180 | 169 | 11 |
| -27°C | 192 | 180 | 11 |
| -26°C | 203 | 192 | 12 |
| -25°C | 216 | 203 | 12 |
| -24°C | 228 | 216 | 13 |
| -23°C | 241 | 228 | 13 |
| -22°C | 255 | 241 | 14 |
| -21°C | 269 | 255 | 14 |
| -20°C | 283 | 268 | 15 |
| -19°C | 297 | 282 | 15 |
| -18°C | 313 | 297 | 16 |
| -17°C | 328 | 312 | 16 |
| -16°C | 344 | 327 | 17 |
| -15°C | 360 | 343 | 17 |
| -14°C | 377 | 359 | 18 |
| -13°C | 395 | 376 | 18 |
| -12°C | 412 | 393 | 19 |
| -11°C | 431 | 411 | 20 |
| -10°C | 449 | 429 | 20 |
| -9°C | 469 | 448 | 21 |
| -8°C | 488 | 467 | 21 |
| -7°C | 509 | 487 | 22 |
| -6°C | 529 | 507 | 23 |
| -5°C | 551 | 527 | 23 |
| -4°C | 573 | 549 | 24 |
| -3°C | 595 | 570 | 25 |
| -2°C | 618 | 593 | 26 |
| -1°C | 642 | 615 | 26 |
| 0°CH₂O freeze | 666 | 639 | 27 |
| 1°C | 690 | 663 | 28 |
| 2°C | 716 | 687 | 28 |
| 3°C | 742 | 712 | 29 |
| 4°CAC evap target | 768 | 738 | 30 |
| 5°C | 795 | 765 | 31 |
| 6°C | 823 | 792 | 32 |
| 7°C | 852 | 819 | 32 |
| 8°C | 881 | 847 | 33 |
| 9°C | 910 | 876 | 34 |
| 10°C | 941 | 906 | 35 |
| 11°C | 972 | 936 | 36 |
| 12°C | 1,004 | 967 | 37 |
| 13°C | 1,036 | 999 | 38 |
| 14°C | 1,069 | 1,031 | 38 |
| 15°C | 1,103 | 1,064 | 39 |
| 16°C | 1,138 | 1,098 | 40 |
| 17°C | 1,173 | 1,132 | 41 |
| 18°C | 1,210 | 1,168 | 42 |
| 19°C | 1,246 | 1,204 | 43 |
| 20°C | 1,284 | 1,240 | 44 |
| 21°CRoom T | 1,323 | 1,278 | 45 |
| 22°C | 1,362 | 1,316 | 46 |
| 23°C | 1,402 | 1,355 | 47 |
| 24°C | 1,443 | 1,395 | 48 |
| 25°C | 1,485 | 1,436 | 49 |
| 26°C | 1,527 | 1,478 | 50 |
| 27°C | 1,571 | 1,520 | 50 |
| 28°C | 1,615 | 1,563 | 51 |
| 29°C | 1,660 | 1,608 | 52 |
| 30°C | 1,706 | 1,653 | 53 |
| 31°C | 1,753 | 1,699 | 54 |
| 32°C | 1,801 | 1,745 | 55 |
| 33°C | 1,849 | 1,793 | 56 |
| 34°C | 1,899 | 1,842 | 57 |
| 35°CAHRI design ambient | 1,950 | 1,892 | 58 |
| 36°C | 2,001 | 1,942 | 59 |
| 37°C | 2,054 | 1,994 | 60 |
| 38°C | 2,107 | 2,046 | 61 |
| 39°C | 2,162 | 2,100 | 62 |
| 40°C | 2,217 | 2,155 | 62 |
| 41°C | 2,273 | 2,210 | 63 |
| 42°C | 2,331 | 2,267 | 64 |
| 43°CTypical cond saturation | 2,390 | 2,325 | 65 |
| 44°C | 2,449 | 2,384 | 66 |
| 45°C | 2,510 | 2,444 | 66 |
| 46°C | 2,572 | 2,505 | 67 |
| 47°C | 2,635 | 2,567 | 68 |
| 48°C | 2,698 | 2,630 | 68 |
| 49°C | 2,764 | 2,695 | 69 |
| 50°C | 2,830 | 2,760 | 70 |
| 51°C | 2,897 | 2,827 | 70 |
| 52°C | 2,966 | 2,895 | 71 |
| 53°C | 3,037 | 2,966 | 71 |
| 54°C | 3,114 | 3,043 | 71 |
| 55°C | 3,191 | 3,120 | 71 |
| 56°C | 3,267 | 3,197 | 71 |
| 57°C | 3,344 | 3,273 | 71 |
| 58°C | 3,421 | 3,350 | 71 |
| 59°C | 3,498 | 3,427 | 71 |
| 60°C | 3,574 | 3,504 | 71 |
| 61°C | 3,651 | 3,581 | 70 |
| 62°C | 3,728 | 3,657 | 70 |
| 63°C | 3,805 | 3,734 | 70 |
| 64°C | 3,887 | 3,817 | 70 |
| 65°C | 3,972 | 3,903 | 69 |
Full saturation values at 1° increments — toggle between °F / PSIG and °C / kPa. Use Print / Save as PDF for laminated shop reference, or download the CSV / JSON below for use in other tools. R-452B PT chart data: CoolProp 7.2.0 (REFPROP-compatible Helmholtz EOS) or manufacturer datasheet, validated against AHRI Standard 700-2019.
At a glance
Chemistry
Lubricant compatibility
POE required. A2L — mildly flammable. Long-term R-410A replacement with very similar operating pressures (within ~5%), enabling near drop-in compatibility for compatible-rated equipment.
Blend composition
- R-3267.0%
- R-1234yf26.0%
- R-1257.0%
Trade names
- Opteon XL55Chemours
- Solstice 452BHoneywell
Common applications
- Residential and light commercial AC (R-410A replacement)
- Heat pumps
- VRF/VRV systems
Properties
- Boiling point (1 atm)-50.7°C / -59.2°F
- Critical pointNo single point — blend critical locus
- Molar mass63.53 g/mol
- Temperature glide2.0°F
- ODP0
- GWP (AR5, 100-yr)698
- GWP (AR6, 100-yr)766
What is R-452B?
R-452B is a ternary blend developed jointly as a long-term R-410A replacement for residential and light commercial AC. The 67% R-32 content provides capacity and pressure characteristics very close to R-410A; the 26% R-1234yf substantially reduces GWP; the 7% R-125 fine-tunes the safety class and pressure envelope.
The result is an A2L mildly-flammable blend with GWP 698 — just barely below the EPA AIM Act 700 threshold for new residential AC equipment. Operating pressures are within approximately 5% of R-410A across the typical envelope, making R-452B a candidate for equipment design transitions that minimize redesign of pressure-bearing components.
Where R-452B is used
- Residential central air conditioning (new equipment in some OEM portfolios)
- Heat pumps (residential and light commercial)
- Light commercial split systems
- VRF/VRV systems (some manufacturers)
- R-410A replacement candidate (compete with R-32 and R-454B)
Regulatory & phase-down status
R-452B's GWP of 698 sits just below the AIM Act 700 threshold for new residential AC equipment — compliant by a narrow margin. It is one of three primary A2L replacements for R-410A (alongside R-32 at GWP 675 and R-454B at GWP 466), with R-452B's position being the closest operational match to R-410A among the three.
The OEM split for new US residential AC equipment is broadly: Daikin and Mitsubishi favor R-32 (driven by their global VRF and split product lines); Carrier favors R-454B (Puron Advance brand continuity); other manufacturers vary, with R-452B picked up by some specific equipment lines where the near-identical-to-R-410A pressure envelope simplifies the equipment transition.
Service notes
Polyolester (POE) oil is required — the same as R-410A. R-452B is near-azeotropic with a small glide (~1°F); for most service work this is negligible.
A2L safety class requires: A2L-rated charge limits per UL 60335-2-40 and ASHRAE 15; refrigerant leak detection sensors; no open flames during service (brazing requires evacuation and venting); A2L-rated recovery cylinders (yellow with red top stripe); technician training on A2L handling beyond standard EPA Section 608.
Temperature glide
R-452B is a zeotropic blend: at constant pressure it boils across a temperature range rather than at a single point. This affects EXV sizing, charge measurement, and superheat measurement. Use the dew curve for superheat, bubble curve for subcooling.
Operating cycle
Phase-down timeline
No phase-down milestones documented for R-452B in this build. This may mean: (a) no regulatory phase-down currently published; (b) the refrigerant has local regulatory schedules not yet transcribed into the site dataset; or (c) it is a specialty refrigerant outside the main regulatory frameworks. For authoritative current status, consult the EPA AIM Act allocations (40 CFR Part 84), EU F-Gas Regulation 517/2014 + 2024/573, and the relevant national implementations of the Kigali Amendment.
Global warming potential, in context
Residential air conditioning
Retrofit and replacement paths
R-452B replaces
Frequently asked
›What is R-452B also called?
R-452B is the ASHRAE 34 designation. Its primary commercial brands are Chemours Opteon XL55 and Honeywell Solstice 452B. The 'XL' prefix in Chemours' Opteon brand indicates the A2L/extra-low-GWP product line; the 'L55' suggests 'lower-GWP, 55' as an internal designation. R-452B's pressure envelope is the close match to R-410A — making it the 'least disruptive' A2L replacement from an equipment-design standpoint.
›How does R-452B compare to R-410A?
Pressures within ~5% across the envelope. R-452B at 70°F: 192 PSIG bubble / 186 PSIG dew vs R-410A 201/201. Similar saturation curves; POE oil is the same; service equipment rated for R-410A (800 PSI high-side) is appropriate for R-452B from a pressure standpoint. The substantive difference is the A2L safety class (R-410A is A1) and the substantially lower GWP (R-452B 698 vs R-410A 2088).
›How does R-452B compare to R-32 and R-454B?
All three are A2L R-410A replacements. R-32 is pure (no glide, GWP 675); R-452B is a near-azeotrope (~1°F glide, GWP 698); R-454B is a near-azeotrope (~0.4°F glide, GWP 466). R-452B has the closest pressure match to R-410A and the highest GWP of the three. R-454B has the lowest GWP. R-32 has the highest volumetric capacity. The choice for new equipment depends on the OEM's preferred refrigerant family — most US residential AC OEMs have standardized on R-32 or R-454B; R-452B is a smaller share.
›What lubricant does R-452B use?
Polyolester (POE) oil — the same as R-410A, R-32, and most modern HFC/HFO refrigerants. Mineral oil and alkylbenzene are not miscible. POE is hygroscopic; vacuum integrity matters before charging.
›Can I retrofit R-410A to R-452B?
Not as a true drop-in despite the very close pressures. The A2L safety class requires equipment design changes that an R-410A (A1) system doesn't have: A2L-rated compressor electrical, integrated leak detection, charge limits per UL 60335-2-40. Retrofitting in practice means replacing the compressor and safety systems — at which point full equipment replacement with new R-452B-rated equipment is the standard path.
›Is R-452B AIM Act compliant?
Yes, by a narrow margin. R-452B's GWP of 698 falls below the AIM Act 700 threshold for new residential AC equipment. The margin is small enough that any future regulatory tightening (say, a 500-GWP threshold for stationary equipment) would constrain R-452B; for now it is positioned as one of the long-term A2L replacements for R-410A.
›What is the normal operating pressure of R-452B?
Very close to R-410A. At 95°F outdoor ambient with a properly-charged residential R-452B system, expect roughly 125–145 PSIG suction and 350–410 PSIG discharge — within 5% of R-410A at the same conditions. Saturation pressure at 70°F is 192 PSIG bubble / 186 PSIG dew.