HVAC PT Charts
RefrigerantASHRAE R-452B

R452B PT Chart

Updated October 19, 2026

R-452B

A2L Lower toxicity, lower flammabilityHFC/HFO blend AIM Act HFC
R-452B AHRI Guideline N service cylinderIllustration of a refrigerant cylinder painted light green gray (RAL 7044), the color AHRI Guideline N-2017 calls for on all new refrigerant containers from 2020. Label: R452B, safety class A2L, GWP 698. Red band on the shoulder: AHRI Guideline N-2017 calls for one on containers of flammable refrigerants.R452BA2LGWP 698
Illustration of a refrigerant cylinder painted light green gray (RAL 7044), the color AHRI Guideline N-2017 calls for on all new refrigerant containers from 2020[1], section 4.8. Label: R-452B, safety class A2L, GWP 698. Red band on the shoulder: AHRI Guideline N-2017 calls for one on containers of flammable refrigerants[1], section 4.7.
R-32/R-1234yf/R-125 (67/26/7)

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 replacement for R-410A in residential and light commercial AC.

R-452B saturation pressure splits across its glide: dew 108.8 PSIG at 40°F, bubble 303.9 PSIG at 100°F, and 185.9–192.5 PSIG dew-to-bubble at 70°F. Use the dew column for superheat and the bubble column for subcooling. The full table below runs from −40°F to 150°F in 1°F steps.

Not yet checked against an independent source.

Saturation @ 70°F
192.5 / 185.9 PSIG
GWP (100-yr)
698 US EPA value, 40 CFR 84.64(b)
Temperature glide
2.0°F
Boiling point
bubble −59.2°F / dew −57.6°F
Sourced facts
Temperature glide
2.0°F at a 40°F dew point[3]
R-452B PT calculator Superheat

R-452B PT chart — 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).

R-452B PT Chart — Pressure-Temperature Saturation Table

Computed with CoolProp 7.2.0 in 1°F steps · hvacptcharts.com

R-452B · 1° increments · °F / PSIG
Tinted rows: 32°F H₂O freeze
R-452B pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Bubble (PSIG)Dew (PSIG)
−40°F 9.78.7
−39°F 10.49.3
−38°F 11.010.0
−37°F 11.610.6
−36°F 12.311.2
−35°F 13.011.9
−34°F 13.712.5
−33°F 14.313.2
−32°F 15.113.9
−31°F 15.814.6
−30°F 16.515.3
−29°F 17.316.0
−28°F 18.016.7
−27°F 18.817.5
−26°F 19.618.2
−25°F 20.419.0
−24°F 21.219.8
−23°F 22.120.6
−22°F 22.921.4
−21°F 23.822.3
−20°F 24.723.1
−19°F 25.624.0
−18°F 26.524.9
−17°F 27.425.8
−16°F 28.326.7
−15°F 29.327.6
−14°F 30.328.5
−13°F 31.329.5
−12°F 32.330.5
−11°F 33.331.5
−10°F 34.432.5
−9°F 35.433.5
−8°F 36.534.6
−7°F 37.635.6
−6°F 38.736.7
−5°F 39.937.8
−4°F 41.038.9
−3°F 42.240.0
−2°F 43.441.2
−1°F 44.642.4
0°F 45.843.5
1°F 47.144.7
2°F 48.346.0
3°F 49.647.2
4°F 50.948.5
5°F 52.349.8
6°F 53.651.1
7°F 55.052.4
8°F 56.453.7
9°F 57.855.1
10°F 59.256.5
11°F 60.757.9
12°F 62.159.3
13°F 63.660.8
14°F 65.262.2
15°F 66.763.7
16°F 68.365.2
17°F 69.966.8
18°F 71.568.3
19°F 73.169.9
20°F 74.871.5
21°F 76.473.2
22°F 78.174.8
23°F 79.976.5
24°F 81.678.2
25°F 83.479.9
26°F 85.281.6
27°F 87.083.4
28°F 88.985.2
29°F 90.887.0
30°F 92.788.9
31°F 94.690.7
32°F H₂O freeze96.692.6
33°F 98.594.6
34°F 100.596.5
35°F 102.698.5
36°F 104.6100.5
37°F 106.7102.5
38°F 108.8104.6
39°F 111.0106.6
40°F 113.2108.8
41°F 115.4110.9
42°F 117.6113.1
43°F 119.8115.2
44°F 122.1117.5
45°F 124.4119.7
46°F 126.8122.0
47°F 129.2124.3
48°F 131.6126.6
49°F 134.0129.0
50°F 136.5131.4
51°F 139.0133.8
52°F 141.5136.3
53°F 144.0138.8
54°F 146.6141.3
55°F 149.2143.8
56°F 151.9146.4
57°F 154.6149.0
58°F 157.3151.7
59°F 160.0154.3
60°F 162.8157.0
61°F 165.6159.8
62°F 168.5162.5
63°F 171.3165.4
64°F 174.3168.2
65°F 177.2171.1
66°F 180.2174.0
67°F 183.2176.9
68°F 186.3179.9
69°F 189.3182.9
70°F 192.5185.9
71°F 195.6189.0
72°F 198.8192.1
73°F 202.0195.3
74°F 205.3198.5
75°F 208.6201.7
76°F 211.9205.0
77°F 215.3208.3
78°F 218.7211.6
79°F 222.2215.0
80°F 225.7218.4
81°F 229.2221.8
82°F 232.8225.3
83°F 236.4228.9
84°F 240.0232.4
85°F 243.7236.0
86°F 247.4239.7
87°F 251.2243.4
88°F 255.0247.1
89°F 258.8250.9
90°F 262.7254.7
91°F 266.6258.5
92°F 270.6262.4
93°F 274.6266.4
94°F 278.7270.3
95°F 282.8274.3
96°F 286.9278.4
97°F 291.1282.5
98°F 295.3286.7
99°F 299.6290.9
100°F 303.9295.1
101°F 308.2299.4
102°F 312.6303.7
103°F 317.1308.1
104°F 321.5312.5
105°F 326.1317.0
106°F 330.7321.5
107°F 335.3326.0
108°F 340.0330.6
109°F 344.7335.3
110°F 349.4340.0
111°F 354.3344.7
112°F 359.1349.5
113°F 364.0354.4
114°F 369.0359.3
115°F 374.0364.2
116°F 379.0369.2
117°F 384.1374.3
118°F 389.3379.4
119°F 394.5384.6
120°F 399.8389.8
121°F 405.1395.0
122°F 410.4400.3
123°F 415.8405.7
124°F 421.3411.1
125°F 426.8416.6
126°F 432.4422.1
127°F 438.0427.7
128°F 443.7433.4
129°F 449.4439.1
130°F 455.2444.8
131°F 461.0450.7
132°F 466.9456.5
133°F 472.9462.5
134°F 478.9468.5
135°F 485.0474.5
136°F 491.1480.6
137°F 497.3486.8
138°F 503.5493.1
139°F 509.8499.4
140°F 516.1505.7
141°F 522.6512.2
142°F 529.0518.7
143°F 535.6525.2
144°F 542.2531.9
145°F 548.8538.6
146°F 555.5545.3
147°F 562.3552.2
148°F 569.2559.1
149°F 576.1566.1
150°F 583.1573.1
CoolProp 7.2.0 · PSIG/kPa = gauge · PSIA = PSIG + 14.6959 · kPa(abs) = kPa(gauge) + 101.325

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 (published Helmholtz equations of state / mixture models — see the source citations above).

A2L
Lower toxicity, lower flammability

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. ASHRAE safety group A2L: lower toxicity and lower flammability. 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

Pressure
Temperature
°F
70°F: 192.5 PSIG (bubble)185.9 PSIG (dew)
Quick lookup — R-452B
192.5 / 185.9PSIG(1,327 / 1,282 kPa)
Bubble Dew· zeotropic blend
Range: −40 to 150°F Open full PT calculator →
Common service temperatures
32°F
97 / 93PSIG
Freezing
45°F
124 / 120PSIG
Heat-pump heat
70°F
192 / 186PSIG
Standard
75°F
209 / 202PSIG
Test ref
80°F
226 / 218PSIG
Warm
95°F
283 / 274PSIG
Summer peak

Saturation values from CoolProp 7.2.0 mixture model: R-32/R-1234yf/R-125, 67/26/7% by mass[3]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

R-32/R-1234yf/R-125 (67/26/7)
Ternary HFC/HFO blend

Lubricant compatibility

POEMO

POE required. A2L — lower flammability. Long-term R-410A replacement with very similar operating pressures (within ~5%), enabling retrofit compatibility for compatible-rated equipment.

Blend composition

  • R-32 67.0%
  • R-1234yf 26.0%
  • R-125 7.0%

Trade names

  • Opteon XL55 — Chemours
  • Solstice 452B — Honeywell

Common applications

  • Residential and light commercial AC (R-410A replacement)
  • Heat pumps
  • VRF/VRV systems

Properties

  • Boiling point (1 atm)
    bubble −59.2°F (−50.7°C), dew −57.6°F (−49.8°C)
  • Critical point
    No single point — blend critical locus
  • Molar mass
    63.53 g/mol
  • Temperature glide
    2.0°F
  • ODP
    0
  • GWP (100-yr)
    698 US EPA value, 40 CFR 84.64(b) IPCC: AR4 not assessed · AR5 676 · AR6 779
  • New-equipment status (US)
    Restricted in 20 new-equipment categories — US new-equipment rules (40 CFR 84.54).

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 drives the capacity and pressure characteristics; 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 700-GWP limit in 40 CFR 84.54(a)(1), (c)(1) for new residential and light-commercial AC and heat pumps.

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 700-GWP limit in 40 CFR 84.54(a)(1), (c)(1) for new residential and light-commercial AC and heat pumps — 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 465).

The OEM split for new US residential AC equipment is broadly between R-32 and R-454B (Carrier's Puron Advance is R-454B), with R-452B picked up by some specific equipment lines.

Service notes

Polyolester (POE) oil is required — the same as R-410A. R-452B is near-azeotropic with a small glide (~2°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 detection where the standard requires it; no open flames during service (brazing requires evacuation and venting); A2L-rated recovery cylinders. Technician training on A2L handling beyond standard EPA Section 608 is recommended.

Temperature glide

Temperature glide across evaporator at constant pressureR-452B at 113 PSIG suction→ refrigerant flow →Entry: 40.0°F Mid: 41.0°F Exit: 42.0°F Glide = 2.0°F Position along evaporator coil40°F 42°F

R-452B is a zeotropic blend: at constant pressure it boils across a temperature range rather than at a single point. Use the dew curve for superheat, bubble curve for subcooling.

Operating cycle

CompressorRaises pressureCondenserRejects heat to outdoorsExpansion deviceDrops pressureEvaporatorAbsorbs heat from indoorsDischarge: 349 PSIG, 180°F Liquid: 349 PSIG, 100°F Evap inlet: 109 PSIG, 40°F (two-phase)Suction: 109 PSIG, 50°F Example cycle for R-452B (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)

Phase-down timeline

R-452B contains HFC-32 and HFC-125, regulated substances under the AIM Act. Its GWP under 40 CFR 84.64 is 698, at or above the limit in 20 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-452B”).

R-452B is not restricted in new residential & light-commercial AC and heat pumps (its 84.64 GWP 698 is below that subsector's limit).

HFC production & consumption allowances step down to 30% of baseline in 2029–2033, 20% of baseline in 2034–2035, and 15% of baseline in 2036 and later (42 U.S.C. 7675(e)(2)(C)).

Full 40 CFR 84.54 new-equipment rules for R-452B →

US new-equipment rules (40 CFR 84.54)

R-452B contains HFC-32 and HFC-125, regulated substances under the AIM Act. Under 40 CFR 84.64(b) its GWP is 698: each component's GWP times its mass fraction; components without a GWP under 84.64 are left out (84.64(c)). That value is compared against each 40 CFR 84.54 subsector limit below.

Its GWP (698) is under every 40 CFR 84.54 limit for residential & light-commercial AC and heat pumps, so those restrictions don't apply there.

  • Not restricted in new residential & light-commercial AC and heat pumps.
All 84.54 categories restricting R-452B (20)
Refrigeration, air conditioning & heat pumps (13)
January 1, 2025Household refrigerators and freezersGWP ≥ 150(a)(3)
January 1, 2025Retail food refrigeration — stand-alone unitsGWP ≥ 150(a)(4)
January 1, 2025Vending machinesGWP ≥ 150(a)(5)
January 1, 2026Industrial process refrigeration products (non-chiller), charge 200 lb or greater, refrigerant entering the evaporator warmer than −22°F (−30°C)GWP ≥ 150(a)(12)(i)
January 1, 2026Industrial process refrigeration products (non-chiller), charge less than 200 lb, refrigerant entering the evaporator warmer than −22°F (−30°C)GWP ≥ 300(a)(12)(ii)
January 1, 2026Ice makers — batch type up to 1,000 lb of ice per 24 h and continuous type up to 1,200 lb per 24 hGWP ≥ 150(a)(8)(i)
January 1, 2026Industrial process refrigeration systems (non-chiller), charge 200 lb or greater, evaporator inlet warmer than −22°F (−30°C), not the high-temperature side of a cascadeGWP ≥ 150(c)(10)(i)
January 1, 2026Industrial process refrigeration systems (non-chiller), charge less than 200 lb, evaporator inlet warmer than −22°F (−30°C)GWP ≥ 300(c)(10)(ii)
January 1, 2026Industrial process refrigeration — high-temperature side of cascade systems, evaporator inlet warmer than −22°F (−30°C)GWP ≥ 300(c)(10)(iii)
January 1, 2027Refrigerated food processing and dispensing products outside the scope of UL 621, charge 500 g or lessGWP ≥ 150(a)(9)(i)
January 1, 2032Retail food refrigeration — remote condensing unitsGWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)(c)(11)(ii)
January 1, 2032Supermarket systemsGWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)(c)(12)(ii)
January 1, 2032Cold storage warehouse systemsGWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)(c)(9)(ii)
Motor vehicle air conditioning (3)
October 24, 2024Motor vehicle air-conditioning in Model Year 2025 and later light-duty passenger cars and trucks (gross vehicle weight rating under 8,500 lb)GWP ≥ 150(a)(13)(i)
Model Year 2028Motor vehicle air-conditioning in medium-duty passenger vehicles, heavy-duty pickup trucks and complete heavy-duty vans whose air-conditioning will not be modified by upfittersGWP ≥ 150(a)(13)(ii)
January 1, 2028Motor vehicle air-conditioning in certain nonroad vehicles (agricultural tractors over 40 horsepower; self-propelled agricultural machinery; compact equipment; construction, forestry and mining equipment; and commercial utility vehicles)GWP ≥ 150(a)(13)(iii)
Foam blowing agents (2)
January 1, 2025Foam products: rigid polyurethane appliance foam, commercial refrigeration foam, laminated boardstock, marine flotation foam, sandwich panels, slabstock; flexible polyurethane; integral skin polyurethane; polystyrene (extruded boardstock, billet, extruded sheet); phenolic insulation board and bunstock; polyisocyanurate laminated boardstock; polyolefin; rigid polyurethane spray foamGWP ≥ 150(a)(14)
January 1, 2026Foam products in the (a)(14) formulations for use in space and military applicationsGWP ≥ 150(a)(15)
Aerosol propellants / solvents (2)
January 1, 2025Aerosol productsGWP ≥ 150(a)(16)(i)
January 1, 2028Aerosol products (all, except defense sprays as defined in 84.3)GWP ≥ 150(a)(16)(ii)

Servicing. 40 CFR 84.54 restricts new manufacture/import, later sale/distribution, and installation. "Installation" is defined in 84.54(e); repairing or servicing existing R-452B equipment is not an installation unless it meets 84.54(e), so existing systems can keep being serviced. From January 1, 2029, servicing or repairing R-452B equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant[2].

Source: 40 CFR 84.54, current through 91 FR 31329 (May 26, 2026). Installation defined at 40 CFR 84.54(e).

Global warming potential, in context

Residential air conditioning

R-454B465R-32675R-452B698R-407C1.8kR-221.8kR-410A2.1k

Retrofit and replacement paths

R-452B replaces

R-452B vs R-410A: saturation pressure

Saturation pressure (PSIG, gauge) for R-452B vs R-410A — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-452B. Source: CoolProp 7.2.0 dataset.
TempR-452BR-410A
0°F43.5 / 45.848.4(+6%)
40°F108.8 / 113.2118.8(+5%)
70°F185.9 / 192.5201.8(+5%)
100°F295.1 / 303.9318.5(+5%)

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.

›How does R-452B compare to R-410A?

POE oil is the same. 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 (~2°F glide, GWP 698); R-454B is a near-azeotrope (~2.3°F glide, GWP 465). R-452B has 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.

›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 simple swap. The A2L safety class requires equipment design changes that an R-410A (A1) system doesn't have: A2L-rated compressor electrical, refrigerant detection where the standard requires it, charge limits per UL 60335-2-40.

›Is R-452B AIM Act compliant?

Yes, by a narrow margin. R-452B's GWP of 698 falls below the 700-GWP limit in 40 CFR 84.54(a)(1), (c)(1) for new residential and light-commercial AC and heat pumps. The margin is small enough that any future regulatory tightening 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?

Operating pressure depends on evaporator load and ambient. The saturation pressures are in the PT table and the comparison table on this page.

Download this dataset

Full PT chart for R-452B · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

  1. [1]
    2017 Guideline for Assignment of Refrigerant Container Colors (AHRI Guideline N-2017). AHRI. 2017. https://www.ahrinet.org/system/files/2023-06/AHRI_Guideline_N_2017.pdf (accessed October 2, 2026)
  2. [2]
    40 CFR 84.112 — Reclamation. eCFR (Office of the Federal Register). up to date as of 9/25/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-C/section-84.112 (accessed October 2, 2026). 89 FR 82859, Oct. 11, 2024
  3. [3]
    CoolProp 7.2.0. CoolProp (I. H. Bell, J. Wronski, S. Quoilin, V. Lemort). https://coolprop.org/ (accessed October 2, 2026). Bell, I. H.; Wronski, J.; Quoilin, S.; Lemort, V. Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp. Ind. Eng. Chem. Res. 53, 2498–2508 (2014). https://doi.org/10.1021/ie4033999

Data sources & provenance

PT chart
CoolProp 7.2.0 mixture model: R-32/R-1234yf/R-125, 67/26/7% by mass
Properties
CoolProp 7.2.0 + ASHRAE Standard 34-2022
GWP (100-yr)
US EPA value, 40 CFR 84.64(b) · IPCC AR4/AR5/AR6 on the GWP rankings
Table computed
October 2026

Reference material. Always verify pressure values against the equipment data plate and manufacturer service literature before charging or troubleshooting a specific system. Saturation pressure differs from operating pressure — see superheat & subcooling fundamentals. See how this PT table is calculated in our methodology.