HVAC PT ChartsVerified saturation data · 61 refrigerants
RefrigerantASHRAE R-507A

R-507A

A1Non-flammableHFC blend AIM Act phase-down
R-125/R-143a (50/50)

Azeotropic R-125/R-143a binary blend (50/50 mass) — A1 safety, GWP 3985, zero glide. Honeywell Genetron AZ-50 / Chemours Suva 507. The azeotropic alternative to R-404A for legacy low-temperature commercial refrigeration; aggressively phased down.

Saturation @ 70°F
153.0PSIG
GWP (IPCC AR5)
3985100-yr
Temperature glide
≈0°F
Boiling point
-52.1°F
Sourced facts
ASHRAE safety class
A1[src]
Composition (mass)
50% R-125 / 50% R-143a[src]
GWP (100-yr)
3985IPCC AR5[src]
ODP
0[src]
Normal boiling point
−52.1°F (−46.7°C)[src]
Temperature glide
≈0°F[src]
Required lubricant
POE[src]
New-equipment status
Restricted[src]
R-507A PT calculator Superheat
A1
Non-flammable

Lower toxicity (Occupational Exposure Limit ≥ 400 ppm). No flame propagation in air at standard atmospheric pressure and 60°C. R-134a, R-22, R-410A, R-404A, R-744 (CO2) are A1.

Flammability
None (no flame propagation)
Toxicity
Lower (OEL ≥ 400 ppm)

Classification per ANSI/ASHRAE Standard 34-2022. See full reference.

01

Saturation pressure-temperature curve

Pressure
Temperature
°F
70°F: 153.0 PSIG
Quick lookup — R-507A
153.0PSIG(1,055 kPa)
Range: -40 to 148°FOpen full PT calculator →
Common service temperatures
32°F
76PSIG
Freezing
45°F
98PSIG
Heat-pump heat
70°F
153PSIG
Standard
75°F
166PSIG
Test ref
80°F
180PSIG
Warm
95°F
225PSIG
Summer peak

Saturation values from CoolProp 7.2.0 R507A.mix. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

02

R-507A PT chart PDF — printable saturation table

Looking for the R-507A 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-507A PT Chart — Pressure-Temperature Saturation Table

1° increments · Source: CoolProp 7.2.0 / manufacturer datasheet · hvacptcharts.com

R-507A · 1° increments · °F / PSIG
Tinted rows: 32°F H₂O freeze · -40°F Deep freeze evap · -20°F LT evap target · 0°F LT box temp · 95°F AHRI design ambient · 110°F Cond saturation
R-507A pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Pressure (PSIG)
-40°FDeep freeze evap5.4
-39°F5.9
-38°F6.4
-37°F7.0
-36°F7.5
-35°F8.1
-34°F8.6
-33°F9.2
-32°F9.8
-31°F10.3
-30°F11.0
-29°F11.6
-28°F12.2
-27°F12.8
-26°F13.5
-25°F14.1
-24°F14.8
-23°F15.5
-22°F16.2
-21°F16.9
-20°FLT evap target17.6
-19°F18.3
-18°F19.1
-17°F19.8
-16°F20.6
-15°F21.4
-14°F22.2
-13°F23.0
-12°F23.8
-11°F24.7
-10°F25.5
-9°F26.4
-8°F27.3
-7°F28.1
-6°F29.1
-5°F30.0
-4°F30.9
-3°F31.9
-2°F32.8
-1°F33.8
0°FLT box temp34.8
1°F35.8
2°F36.9
3°F37.9
4°F39.0
5°F40.0
6°F41.1
7°F42.3
8°F43.4
9°F44.5
10°F45.7
11°F46.9
12°F48.1
13°F49.3
14°F50.5
15°F51.8
16°F53.0
17°F54.3
18°F55.6
19°F56.9
20°F58.3
21°F59.6
22°F61.0
23°F62.4
24°F63.8
25°F65.3
26°F66.7
27°F68.2
28°F69.7
29°F71.2
30°F72.7
31°F74.3
32°FH₂O freeze75.9
33°F77.5
34°F79.1
35°F80.7
36°F82.4
37°F84.1
38°F85.8
39°F87.5
40°F89.3
41°F91.0
42°F92.8
43°F94.6
44°F96.5
45°F98.3
46°F100.2
47°F102.1
48°F104.1
49°F106.0
50°F108.0
51°F110.0
52°F112.0
53°F114.1
54°F116.2
55°F118.3
56°F120.4
57°F122.6
58°F124.8
59°F127.0
60°F129.2
61°F131.4
62°F133.7
63°F136.0
64°F138.4
65°F140.8
66°F143.1
67°F145.6
68°F148.0
69°F150.5
70°F153.0
71°F155.5
72°F158.1
73°F160.7
74°F163.3
75°F165.9
76°F168.6
77°F171.3
78°F174.1
79°F176.8
80°F179.6
81°F182.5
82°F185.3
83°F188.2
84°F191.1
85°F194.1
86°F197.1
87°F200.1
88°F203.1
89°F206.2
90°F209.3
91°F212.5
92°F215.6
93°F218.8
94°F222.1
95°FAHRI design ambient225.4
96°F228.7
97°F232.0
98°F235.4
99°F238.8
100°F242.3
101°F245.8
102°F249.3
103°F252.9
104°F256.5
105°F260.1
106°F263.8
107°F267.5
108°F271.2
109°F275.0
110°FCond saturation278.8
111°F282.7
112°F286.6
113°F290.5
114°F294.5
115°F298.5
116°F302.6
117°F306.7
118°F310.8
119°F315.0
120°F319.2
121°F323.5
122°F327.8
123°F332.1
124°F336.5
125°F340.9
126°F345.4
127°F349.9
136°F392.7
137°F397.7
138°F402.7
139°F407.8
140°F413.0
141°F418.2
142°F423.4
143°F428.7
144°F434.1
145°F439.5
146°F444.9
147°F450.5
148°F456.1
CoolProp 7.2.0 · PSIG/kPa = gauge · PSIA = PSIG + 14.696 · 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-507A PT chart data: CoolProp 7.2.0 (REFPROP-compatible Helmholtz EOS) or manufacturer datasheet, validated against AHRI Standard 700-2019.

03

At a glance

Chemistry

R-125/R-143a (50/50)
Binary HFC azeotropic blend

Lubricant compatibility

POEMO

POE required. Azeotrope — no glide. Used in low-temperature commercial refrigeration as an alternative to R-404A. Higher GWP than R-404A; primary phase-down target.

Blend composition

  • R-12550.0%
  • R-143a50.0%

Trade names

  • Suva 507Chemours
  • Forane 507Arkema
  • Genetron AZ-50Honeywell

Common applications

  • Low-temperature commercial refrigeration
  • Supermarket frozen food
  • Ice machines
  • Transport refrigeration
04

Properties

  • Boiling point (1 atm)
    -46.7°C / -52.1°F
  • Critical point
    No single point — blend critical locus
  • Molar mass
    98.86 g/mol
  • Temperature glide
    Negligible (-0.04°F)
  • ODP
    0
  • GWP (AR5, 100-yr)
    3985
  • GWP (AR6, 100-yr)
    4775
05

What is R-507A?

R-507A is an azeotropic binary blend of 50% R-125 and 50% R-143a by mass [ashrae34]. The composition produces zero temperature glide — operationally equivalent to a pure refrigerant for service measurement purposes. R-507A was developed alongside R-404A in the early 1990s as a CFC R-502 replacement for low-temperature commercial refrigeration.

The defining characteristic in 2026 is very high GWP — 3985, slightly above R-404A's 3922 and among the highest of mainstream HFC refrigerants [ipccar5]. The azeotropic composition is operationally simpler than R-404A's near-azeotropic ternary blend but the GWP positioning is essentially identical — both are aggressively phased down under EPA AIM Act and EU F-Gas Regulation.

Where R-507A is used

  • Low-temperature commercial refrigeration — walk-in freezers, frozen food cases (legacy installations)
  • Medium-temperature commercial refrigeration (legacy)
  • Transport refrigeration — reefer units (legacy)
  • Service supply for the existing R-507A installed base

Regulatory & phase-down status

EU F-Gas Regulation 517/2014 banned R-507A in new sub-40 kW commercial refrigeration from 1 January 2020 [eufgas]. EPA SNAP has delisted R-507A for multiple commercial refrigeration end-use categories through 2024-2025 [snap]; the EPA AIM Act Technology Transitions Rule restricts R-507A for new equipment manufacturing in most categories from 2025 [aimact].

Service of existing R-507A equipment remains legal under current US rules. The standard retrofit path is R-448A or R-449A (A1 HFC blends, GWP ~1390); for new equipment R-454C / R-455A (A2L, GWP 148) or R-744 (CO₂ transcritical) are the long-term low-GWP destinations.

Service notes

POE oil required — same lubricant family as R-404A and R-410A; mineral oil and alkylbenzene are not miscible [ahri700]. The azeotropic composition means service measurement procedures from pure-refrigerant practice apply directly — no bubble/dew curve discipline needed.

R-507A operating pressures are slightly above R-404A across the range. Standard manifold gauges rated 500-800 PSI handle the operating envelope. A1 classification means no A2L procedures required.

07

Operating cycle

CompressorRaises pressureCondenserRejects heat to outdoorsExpansion deviceDrops pressureEvaporatorAbsorbs heat from indoorsDischarge: 279 PSIG, 180°FLiquid: 279 PSIG, 100°FEvap inlet: 89 PSIG, 40°F (two-phase)Suction: 89 PSIG, 50°FTypical residential cooling cycle for R-507A (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)
08

Phase-down timeline

2025202620272028202920302031203220332034203520362037today (2026-06-12)
2025-01-01
AIM Act: most new commercial refrigeration uses prohibited
2036-01-01
AIM Act phase-down: 85% reduction baseline
Regulatory timeline for R-507A
09

Global warming potential, in context

Commercial refrigeration — low temperature

R-7441R-454C148R-455A148R-448A1.4kR-449A1.4kR-221.8kR-404A3.9kR-507A4kEU F-Gas (150)EPA AIM Act (700)
10

Retrofit and replacement paths

R-507A replaces

Replacements for R-507A

Reading the R-507A PT chart — true azeotrope, single curve

R-507A is a true azeotrope — bubble and dew temperatures coincide exactly across the operating range [coolprop]. The PT chart shows a single saturation curve identical in structure to pure refrigerant charts. No glide correction is ever needed.

For service measurement: superheat = suction line temp − saturation temp at suction pressure; subcooling = saturation temp at discharge pressure − liquid line temp. The azeotropic composition delivers pure-refrigerant service simplicity in a blend formulation.

Azeotropic vs near-azeotropic — practical difference is small

R-507A is azeotropic (zero glide); R-404A is near-azeotropic (~0.9°F glide). For practical service purposes the distinction is small — both behave as effectively pure refrigerants for typical superheat/subcooling measurements. The azeotropic R-507A is marginally simpler in fractionation behavior during partial charging or leaking.

The 50/50 R-125/R-143a binary composition is engineered for azeotropic behavior

R-507A combines R-125 (50%, GWP 3500, A1) and R-143a (50%, GWP 4470, A2L) in azeotropic proportions. The 50/50 mass ratio is the specific composition where the blend behaves as a single substance — bubble and dew points coincide.

The mass-weighted GWP: 0.50 × 3500 + 0.50 × 4470 = 1750 + 2235 = 3985 [ipccar5]. Both components are high-GWP HFCs. R-125 is chosen for flammability suppression (A1 classification despite the A2L R-143a content); R-143a provides primary low-temperature capacity.

The composition choice reflects 1990s-era engineering priorities — ozone-depletion elimination (both components are zero-ODP) and operational compatibility with R-502 equipment. GWP was not the binding constraint at the time. Modern regulatory frameworks target the high GWP and have made R-507A non-viable for new equipment.

Pressure envelope close to R-404A — retrofit-compatible

R-507A's pressure envelope is slightly above R-404A across the operating range. At 70°F R-507A saturation is 153 PSIG vs R-404A's 148 PSIG (CoolProp 7.2.0) — within 4%. At 95°F, R-507A is approximately 240 PSIG vs R-404A's 232 PSIG.

The small pressure delta means equipment designed for either R-404A or R-507A typically accepts both without modification. Many commercial refrigeration manufacturers specified either refrigerant interchangeably during the 1995-2020 era when both were widely available.

Standard 500-800 PSI manifold gauges handle the operating range. A1 classification means no A2L equipment additions required.

GWP 3985 — among the highest mainstream refrigerants, very aggressively phased down

R-507A's GWP of 3985 places it slightly above R-404A's 3922 — among the very highest of mainstream HFC refrigerants. The high GWP is the binding constraint on R-507A's continued use under modern regulatory frameworks.

EPA SNAP has delisted R-507A for new equipment in most commercial refrigeration categories through 2024-2025 [snap]. EU F-Gas Regulation 517/2014 banned R-507A in new sub-40 kW commercial refrigeration from 1 January 2020 [eufgas]. The EPA AIM Act Technology Transitions Rule restricts R-507A for new equipment manufacturing in most categories from 2025 [aimact].

For existing R-507A equipment, the situation parallels R-404A: service supply will continue via reclaimed refrigerant; retrofit to R-448A or R-449A (A1, GWP ~1390) is the standard path for GWP reduction without equipment redesign. For long-term low-GWP, new equipment with R-454C / R-455A (A2L, GWP 148) or R-744 (CO₂, GWP 1) is the replacement direction.

R-507A at commercial refrigeration service temperatures

R-507A saturation values across typical commercial refrigeration operating conditions:

  • −40°F (deep freezer) — R-507A saturation approximately 5 PSIG.
  • −20°F (frozen food) — R-507A saturation approximately 19 PSIG.
  • 0°F (freezer) — R-507A saturation approximately 43 PSIG.
  • 30°F (refrigerated case) — R-507A saturation approximately 82 PSIG.
  • 70°F (bench reference) — R-507A saturation 153 PSIG.
  • 95°F (summer condensing) — R-507A saturation approximately 240 PSIG.

For low-temperature commercial refrigeration at −20°F evaporator / 95°F condenser: typical operating pressures 17-25 PSIG suction and 230-260 PSIG discharge. Very similar to R-404A operating ranges in the same equipment.

Service procedures — interchangeable with R-404A practice

R-507A service procedures are essentially interchangeable with R-404A practice. Same safety class (A1), same lubricant family (POE), nearly identical pressure envelope. The only operational distinction is R-507A's zero glide vs R-404A's ~0.9°F glide — both small enough to use single-curve measurement procedures.

| Equipment / procedure | R-404A | R-507A | | --- | --- | --- | | Manifold gauge rating | 500-800 PSI | 500-800 PSI | | Recovery cylinder | Standard 600 PSI | Standard 600 PSI | | Lubricant | POE | POE (identical family) | | Glide handling | Single curve (near-azeotropic) | Single curve (azeotropic) | | Safety class | A1 | A1 | | Charge by weight | Required | Required (azeotrope tolerates top-off better than zeotropic blends) | | Vacuum target | 500 microns held 30+ min | 500 microns held 30+ min |

Service technicians familiar with R-404A can work on R-507A without procedural change. The interchangeability is one reason both refrigerants captured commercial refrigeration market share through the 1995-2020 era — operators could specify either based on availability without retraining.

R-507A in the commercial refrigeration phase-down chain

R-507A's history parallels R-404A's: R-502 (CFC, banned 1996) → R-507A and R-404A (HFC, dominant 1996-2020) → R-448A and R-449A (HFC retrofit, GWP ~1390) → R-454C and R-455A (A2L new equipment, GWP 148) → R-744 (CO₂ transcritical, GWP 1, supermarket scale).

R-507A captured smaller overall market share than R-404A through the 1995-2020 era but remained a meaningful alternative for operators preferring azeotropic composition. The phase-down trajectory is essentially identical to R-404A's — both refrigerants face the same regulatory pressures and the same retrofit and replacement paths.

For new commercial refrigeration installations, R-507A is no longer a viable option in most categories under SNAP delistings and AIM Act provisions. The market has moved to A2L low-GWP blends (R-454C, R-455A) or R-744 CO₂ transcritical at supermarket scale.

How to think about R-507A in 2026 and beyond

R-507A occupies essentially the same position as R-404A in 2026 — a legacy commercial refrigeration refrigerant with a substantial installed base, aggressive phase-down for new equipment, and an established retrofit path to R-448A or R-449A for existing equipment.

Service supply for R-507A will continue indefinitely under current EPA rules; reclaimed R-507A will fill an increasing share of the service market as virgin HFC production tightens through the AIM Act baselines (70% reduction by 2029, 80% by 2034, 85% by 2036). Pricing will rise gradually but stays below the steep R-22-style curve because the installed base is smaller.

For existing R-507A equipment, the decision tree mirrors R-404A: continue on reclaimed R-507A for systems with remaining service life; retrofit to R-448A or R-449A for GWP reduction with A1 preservation; replace with new R-454C / R-455A or R-744 equipment for long-term low-GWP positioning. The choice depends on equipment age, capital availability, and operator-specific regulatory pressures.

11

Frequently asked

›What is the normal operating pressure of R-507A?

Slightly above R-404A. At 70°F R-507A saturation is approximately 153 PSIG (CoolProp 7.2.0). Compare to R-404A at 70°F (148 PSIG).

For low-temperature commercial refrigeration at −20°F evaporator, R-507A saturation is approximately 19 PSIG. Operating pressures track R-404A within a few percent across the typical commercial refrigeration envelope.

›What's the difference between R-507A and R-404A?

Both are HFC blends developed in the early 1990s as R-502 replacements for low-temperature commercial refrigeration. R-507A is azeotropic (50/50 R-125/R-143a, zero glide); R-404A is near-azeotropic (44/52/4 R-125/R-143a/R-134a, ~0.9°F glide). Both have similar GWP (R-507A 3985, R-404A 3922), both A1, both POE oil.

R-507A's azeotropic composition is operationally slightly simpler than R-404A's near-azeotropic ternary blend. For practical service purposes the difference is minimal — both behave as effectively pure refrigerants for superheat/subcooling measurement.

›Why does R-507A have such high GWP?

The 50% R-125 content (GWP 3500) and 50% R-143a content (GWP 4470) combine to produce mass-weighted GWP 3985 [ipccar5]. Both components are high-GWP HFCs — R-125 was chosen for flammability suppression (A1 classification), R-143a for low-temperature capacity.

The trade-off was acceptable when R-507A was developed (early 1990s) because GWP wasn't yet a regulatory constraint. Modern EPA AIM Act and EU F-Gas Regulation target the high GWP and have made R-507A non-viable for new equipment.

›Is R-507A still legal?

Production and service of existing equipment remain legal under current EPA rules [aimact]. EPA SNAP has delisted R-507A for new equipment in most commercial refrigeration categories through 2024-2025 [snap].

For existing R-507A installations, service supply will continue via reclaimed R-507A through the AIM Act production schedule (70%/80%/85% reductions through 2036).

›What lubricant does R-507A use?

Polyolester (POE) oil — same lubricant family as R-404A, R-410A [ahri700]. Mineral oil and alkylbenzene are NOT compatible.

›Does R-507A have temperature glide?

No — R-507A is azeotropic. The 50/50 composition is a true azeotrope with zero temperature glide at typical operating pressures. Service measurement uses a single saturation curve, identical to pure-refrigerant procedures.

This is the primary operational distinction from R-404A — slightly simpler service measurement, though R-404A's ~0.9°F glide is small enough to be practically negligible.

›Can I retrofit R-507A to a lower-GWP refrigerant?

Yes — R-448A and R-449A are A1 HFC blends formulated as R-404A/R-507A drop-in retrofits. Same POE oil family, similar pressure envelope, GWP ~1390 (65% reduction). Standard retrofit procedure: recover R-507A, replace filter-drier, evacuate to 500 microns, recharge by weight.

A2L alternatives (R-454C, R-455A) require A2L-rated equipment design — generally not safe to retrofit A1-rated R-507A equipment without OEM evaluation.

›Why was R-507A developed?

As an azeotropic alternative to R-404A for R-502 replacement. R-502 was banned in 1996 under the Montreal Protocol (R-115 component is CFC). Both R-404A and R-507A were developed in the early 1990s as HFC-only replacements; R-507A's azeotropic composition matched R-502's azeotropic behavior more closely, while R-404A's near-azeotropic ternary blend offered slightly different capacity characteristics.

Both refrigerants captured market share in low-temperature commercial refrigeration through 1995-2020. R-404A captured larger overall market share; R-507A remained a meaningful alternative through the late 2010s.

Download this dataset

Full PT chart for R-507A · CC BY 4.0 · attribute the source

CSV JSON
13

Sources & citations

  1. [1]
    ASHRAE Standard 34-2022
    2022https://www.ashrae.org/technical-resources/standards-and-guidelines
  2. [2]
    IPCC AR5 (2014) Working Group I, Chapter 8, Table 8.A.1
    2014https://www.ipcc.ch/report/ar5/wg1/
  3. [3]
    EPA AIM Act — 40 CFR Part 84 Subpart B + Technology Transitions Rule
    Final Rule Oct 2021, Technology Transitions Rule Oct 2023https://www.epa.gov/climate-hfcs-reduction
  4. [4]
    EPA SNAP — R-507A delistings for commercial refrigeration end-uses
    https://www.epa.gov/snap
  5. [5]
    EU F-Gas Regulation 517/2014 (revised 2024)
    https://climate.ec.europa.eu/eu-action/fluorinated-greenhouse-gases_en
  6. [6]
    CoolProp 7.2.0
    2014 (continually updated)http://www.coolprop.org/doi:10.1021/ie4033999
  7. [7]
    AHRI Standard 700-2019
    2019https://www.ahrinet.org/search-standards
  8. [8]
    Chemours Suva 507 / Honeywell Genetron AZ-50 Technical Information
    https://www.chemours.com/en/products/refrigerants

Data sources & provenance

PT chart
CoolProp 7.2.0 R507A.mix
Cross-checked against
CoolProp 7.2.0 (R507A.mix); ASHRAE Handbook of Refrigeration 2022
Properties
CoolProp 7.2.0 + ASHRAE Standard 34-2022
GWP
IPCC AR5 Table 8.A.1 (composition-weighted)
Generated
2026-06-12

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.