HVAC PT ChartsVerified saturation data · 61 refrigerants
RefrigerantASHRAE R-513A

R-513A

A1Non-flammableHFC blend AIM Act phase-down
R-134a/R-1234yf (44/56)

Azeotropic R-134a/R-1234yf blend (44/56 mass) marketed as Chemours Opteon XP10 — A1 safety, GWP 631 (~56% lower than R-134a), essentially zero glide. The dominant R-134a chiller drop-in retrofit.

Saturation @ 70°F
77.2PSIG
GWP (IPCC AR5)
631100-yr
Temperature glide
≈0°F
Boiling point
-20.9°F
Sourced facts
ASHRAE safety class
A1[src]
Composition (mass)
44% R-134a / 56% R-1234yf±1%[src]
GWP (100-yr)
631IPCC AR5[src]
ODP
0[src]
Normal boiling point
−20.0°F (−28.9°C)[src]
Temperature glide
≈0°F[src]
Required lubricant
POE[src]
Trade name
Opteon XP10[src]
R-513A 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: 77.2 PSIG
Quick lookup — R-513A
77.2PSIG(533 kPa)
Range: -40 to 150°FOpen full PT calculator →
Common service temperatures
32°F
32PSIG
Freezing
45°F
45PSIG
Heat-pump heat
70°F
77PSIG
Standard
75°F
85PSIG
Test ref
80°F
93PSIG
Warm
95°F
121PSIG
Summer peak

Saturation values from CoolProp 7.2.0 R513A.mix. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

02

R-513A PT chart PDF — printable saturation table

Looking for the R-513A 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-513A PT Chart — Pressure-Temperature Saturation Table

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

R-513A · 1° increments · °F / PSIG
Tinted rows: NBP atmospheric crossover · 32°F H₂O freeze · 20°F MT evap target · 35°F MT box temp · 95°F AHRI design ambient · 110°F Cond saturation
R-513A pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Pressure (PSIG)
-40°F-5.8
-39°F-5.5
-38°F-5.3
-37°F-5.0
-36°F-4.8
-35°F-4.5
-34°F-4.2
-33°F-3.9
-32°F-3.6
-31°F-3.3
-30°F-3.0
-29°F-2.7
-28°F-2.4
-27°F-2.1
-26°F-1.8
-25°F-1.4
-24°F-1.1
-23°F-0.7
-22°F-0.4
-21°F-0.0
-20°FNBP (atmospheric)0.3
-19°F0.7
-18°F1.1
-17°F1.5
-16°F1.9
-15°F2.3
-14°F2.7
-13°F3.1
-12°F3.6
-11°F4.0
-10°F4.5
-9°F4.9
-8°F5.4
-7°F5.9
-6°F6.3
-5°F6.8
-4°F7.3
-3°F7.8
-2°F8.3
-1°F8.9
0°F9.4
1°F10.0
2°F10.5
3°F11.1
4°F11.7
5°F12.2
6°F12.8
7°F13.4
8°F14.1
9°F14.7
10°F15.3
11°F15.9
12°F16.6
13°F17.3
14°F17.9
15°F18.6
16°F19.3
17°F20.1
18°F20.8
19°F21.5
20°FMT evap target22.3
21°F23.0
22°F23.8
23°F24.6
24°F25.4
25°F26.2
26°F27.0
27°F27.8
28°F28.7
29°F29.5
30°F30.4
31°F31.3
32°FH₂O freeze32.2
33°F33.1
34°F34.0
35°FMT box temp34.9
36°F35.9
37°F36.8
38°F37.8
39°F38.8
40°F39.8
41°F40.8
42°F41.9
43°F42.9
44°F44.0
45°F45.0
46°F46.1
47°F47.3
48°F48.4
49°F49.5
50°F50.7
51°F51.8
52°F53.0
53°F54.2
54°F55.5
55°F56.7
56°F57.9
57°F59.2
58°F60.5
59°F61.8
60°F63.1
61°F64.4
62°F65.8
63°F67.2
64°F68.5
65°F69.9
66°F71.4
67°F72.8
68°F74.3
69°F75.7
70°F77.2
71°F78.8
72°F80.3
73°F81.8
74°F83.4
75°F85.0
76°F86.6
77°F88.2
78°F89.9
79°F91.5
80°F93.2
81°F94.9
82°F96.7
83°F98.4
84°F100.2
85°F102.0
86°F103.8
87°F105.6
88°F107.4
89°F109.3
90°F111.2
91°F113.1
92°F115.1
93°F117.0
94°F119.0
95°FAHRI design ambient121.0
96°F123.0
97°F125.1
98°F127.2
99°F129.2
100°F131.4
101°F133.5
102°F135.7
103°F137.8
104°F140.1
105°F142.3
106°F144.6
107°F146.8
108°F149.1
109°F151.5
110°FCond saturation153.8
111°F156.2
112°F158.6
113°F161.1
114°F163.5
115°F166.0
116°F168.5
117°F171.0
118°F173.6
119°F176.2
120°F178.8
121°F181.4
122°F184.1
123°F186.8
124°F189.5
125°F192.3
126°F195.0
127°F197.8
128°F200.7
129°F203.6
130°F206.4
131°F209.4
132°F212.3
133°F215.3
134°F218.3
135°F221.3
136°F224.4
137°F227.5
138°F230.6
139°F233.8
140°F237.0
141°F240.2
142°F243.4
143°F246.7
144°F250.0
145°F253.4
146°F256.7
147°F260.1
148°F263.6
149°F267.1
150°F270.6
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-513A 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-134a/R-1234yf (44/56)
Binary HFC/HFO blend

Lubricant compatibility

POEMO

POE required. Near-azeotropic (low glide). Lower-GWP R-134a replacement for chillers and medium-temp refrigeration.

Blend composition

  • R-134a44.0%
  • R-1234yf56.0%

Trade names

  • Opteon XP10Chemours (alternative product line)
  • Solstice N13Honeywell

Common applications

  • Centrifugal and screw chillers
  • Medium-temperature commercial refrigeration
  • Heat pumps
  • R-134a retrofit (drop-in compatible in many systems)
04

Properties

  • Boiling point (1 atm)
    -29.4°C / -20.9°F
  • Critical point
    No single point — blend critical locus
  • Molar mass
    108.43 g/mol
  • Temperature glide
    Negligible (-0.04°F)
  • ODP
    0
  • GWP (AR5, 100-yr)
    631
  • GWP (AR6, 100-yr)
    673
05

What is R-513A?

R-513A is an azeotropic binary blend of 44% R-134a (HFC) and 56% R-1234yf (HFO) by mass [ashrae34]. The azeotropic composition produces near-zero temperature glide — the blend behaves operationally like a pure refrigerant despite being a binary mixture.

R-513A was developed by Chemours as a near-drop-in retrofit for R-134a centrifugal chillers and commercial refrigeration. The pressure envelope closely matches R-134a; the lubricant (POE) is the same; the safety class (A1) is preserved. The retrofit value is GWP reduction — R-513A's 631 is approximately 56% below R-134a's 1430, providing substantial climate impact reduction without equipment-level redesign.

Where R-513A is used

  • R-134a centrifugal chiller retrofit (water-cooled commercial chillers)
  • R-134a screw chiller retrofit
  • Commercial refrigeration retrofit (display cases, beverage coolers)
  • New chiller equipment installations where A1 classification is preferred over R-1234ze(E) A2L

Regulatory & phase-down status

R-513A's GWP of 631 is below the EPA AIM Act 700-GWP threshold for residential AC (though R-513A isn't used in residential AC). For chiller and commercial refrigeration applications, R-513A faces EU F-Gas Regulation thresholds in some categories but provides comfortable margin in others [eufgas][aimact].

R-513A is a transitional refrigerant. The very-low-GWP destination for chillers is R-1234ze(E) (A2L, GWP 7), which requires A2L-rated equipment redesign. For R-134a equipment retrofit, R-513A is the dominant A1 choice; for new equipment specification, R-1234ze(E) or R-515B (A1, GWP 287) are increasingly preferred.

Service notes

POE oil required — same lubricant family as R-134a, so R-134a retrofit to R-513A typically does NOT require oil change [ahri700]. The azeotropic composition (essentially zero glide) means service measurement procedures from R-134a practice apply without modification.

R-513A operating pressures are within 5% of R-134a across the chiller operating range. Standard 500 PSI manifold gauges handle the envelope. A1 classification means no A2L procedures required.

07

Operating cycle

CompressorRaises pressureCondenserRejects heat to outdoorsExpansion deviceDrops pressureEvaporatorAbsorbs heat from indoorsDischarge: 154 PSIG, 180°FLiquid: 154 PSIG, 100°FEvap inlet: 40 PSIG, 40°F (two-phase)Suction: 40 PSIG, 50°FTypical residential cooling cycle for R-513A (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)
08

Phase-down timeline

No phase-down milestones documented for R-513A 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.

Properties: GWP (AR5) 631 · ODP 0 · AIM Act affected · type: hfc-blend
09

Global warming potential, in context

Commercial refrigeration — medium temperature

R-7441R-516A142R-454C148R-455A148R-450A605R-513A631R-448A1.4kR-449A1.4kR-407C1.8kR-221.8kR-407F1.8kR-407A2.1kR-404A3.9kEU F-Gas (150)EPA AIM Act (700)
10

Retrofit and replacement paths

R-513A replaces

Replacements for R-513A

Reading the R-513A PT chart — single curve, azeotropic

R-513A is azeotropic — bubble and dew temperatures coincide at typical operating pressures [coolprop]. The PT chart shows a single saturation curve, identical in structure to pure refrigerant charts like R-134a or R-22.

For service measurement: superheat = suction line temp − saturation temp at suction pressure; subcooling = saturation temp at discharge pressure − liquid line temp. No glide correction needed. Procedures from R-134a practice apply directly.

Azeotropic blend = service simplicity

R-513A is one of the easier blends to work with in service. The azeotropic composition was deliberately engineered to deliver R-134a-like service simplicity. Technicians transitioning from R-134a to R-513A face essentially no procedural changes — same lubricant, same pressure envelope, same single-curve measurement.

The 44/56 R-134a/R-1234yf composition is azeotropic

R-513A combines R-134a (44%, GWP 1430, A1) and R-1234yf (56%, GWP 4, A2L) in azeotropic proportions. The 44/56 mass ratio produces a specific composition where the blend behaves like a single substance — bubble and dew points coincide at typical operating pressures.

The mass-weighted GWP: 0.44 × 1430 + 0.56 × 4 = 629 + 2 = 631 [ipccar5]. The R-1234yf component dilutes the GWP substantially without significantly changing the pressure envelope from R-134a's profile.

The A1 safety classification is preserved despite R-1234yf being A2L individually. The R-134a content (44%) provides enough non-flammable mass fraction to keep the blend below the A2L flammability threshold per ASHRAE 34 testing protocols.

Pressure envelope within 5-8% of R-134a

R-513A's pressure envelope closely matches R-134a — the design intent of the retrofit blend. At 70°F R-513A saturation is 77 PSIG vs R-134a's 71 PSIG (CoolProp 7.2.0) — approximately 8% higher. At 95°F, R-513A is approximately 132 PSIG vs R-134a's 124 PSIG — approximately 7% higher.

The small pressure delta means R-134a-rated equipment handles R-513A within design tolerances. Compressor surge protection, expansion-valve setpoints, and accumulator design all carry over from R-134a operation without modification.

For chiller applications specifically, the centrifugal compressor design is forgiving of small pressure deltas — within ±10% the compressor operates in its efficient envelope without redesign. R-513A retrofit of R-134a chillers is typically successful without compressor modification.

GWP 631 — substantial reduction with A1 preservation

R-513A's GWP of 631 represents a 56% reduction from R-134a's 1430 — the primary value proposition of the retrofit. The reduction comes entirely from the R-1234yf component (GWP 4); the 44% R-134a content drives most of the residual GWP.

For regulatory positioning: R-513A's 631 is below the EPA AIM Act 700-GWP threshold for residential AC (though R-513A isn't used in residential AC). For chiller and commercial refrigeration applications, R-513A faces EU F-Gas Regulation thresholds in some categories.

The long-term low-GWP chiller destination is R-1234ze(E) (GWP 7) or R-515B (GWP 287). R-513A is a transitional refrigerant for R-134a chiller retrofit through the late 2020s; new chiller equipment increasingly specifies the lower-GWP alternatives.

R-513A at chiller operating temperatures

R-513A saturation values across typical chiller operating conditions:

  • 35°F (chilled water evaporator) — R-513A saturation approximately 30 PSIG.
  • 45°F (chilled water reference) — R-513A saturation approximately 40 PSIG.
  • 70°F (bench reference) — R-513A saturation 77 PSIG.
  • 85°F (cooling tower water supply) — R-513A saturation approximately 102 PSIG.
  • 95°F (warm cooling water condenser) — R-513A saturation approximately 132 PSIG.
  • 105°F (extreme condenser operation) — R-513A saturation approximately 152 PSIG.

For chiller operation at typical conditions (45°F leaving chilled water, 95°F entering condenser water): expect 35-45 PSIG suction and 120-150 PSIG discharge. Very similar to R-134a operating ranges in the same equipment.

R-134a to R-513A retrofit — operationally simple

The R-134a to R-513A retrofit is one of the simpler refrigerant transitions in commercial HVAC. Same safety class, same lubricant family, near-azeotropic behavior, similar pressure envelope.

| Step | Action | | --- | --- | | 1. Recover | Recover R-134a per EPA Section 608. | | 2. Drier | Replace filter-drier (standard practice for major service). | | 3. Oil inspection | Inspect POE oil. Replace if degraded; otherwise leave in place. | | 4. Evacuate | Pull vacuum to 500 microns; hold ≥30 minutes. | | 5. Recharge | Charge R-513A by weight to OEM nameplate (95-100% of R-134a charge). | | 6. Verify | Verify chiller operation at design conditions. |

Capacity match is within 3-5% of R-134a for most chiller applications. Some efficiency adjustment may be needed at extreme operating conditions but typical performance is within acceptable tolerances. The retrofit can typically be completed in standard chiller service time without major equipment downtime.

R-134a chiller retrofit options — R-513A vs R-450A vs R-515B vs R-1234ze(E)

For R-134a chillers facing GWP-driven phase-down pressure, four retrofit and replacement paths exist:

| Refrigerant | Class | GWP | Composition | Best fit | | --- | --- | --- | --- | --- | | R-513A | A1 | 631 | R-134a/R-1234yf 44/56 azeotrope | R-134a drop-in retrofit | | R-450A | A1 | 605 | R-134a/R-1234ze(E) 42/58 azeotrope | R-134a drop-in (Honeywell alternative) | | R-515B | A1 | 287 | R-1234ze(E)/R-227ea 91.1/8.9 azeotrope | New equipment, lower GWP than R-513A/R-450A | | R-1234ze(E) | A2L | 7 | Pure HFO | New chiller equipment, A2L design required |

R-513A and R-450A are the A1 drop-in retrofits — operationally simplest, lowest equipment redesign requirement. R-515B is the lower-GWP A1 alternative for new equipment where some efficiency adjustment is acceptable. R-1234ze(E) is the very-low-GWP new-equipment destination, requiring A2L-rated chiller design.

The choice typically depends on equipment age and capital availability. Existing R-134a chillers with substantial remaining life: R-513A or R-450A retrofit. Major chiller replacement decisions: R-515B (A1) or R-1234ze(E) (A2L) for long-term GWP positioning.

How to think about R-513A in 2026 and beyond

R-513A occupies the R-134a chiller retrofit niche through the late 2020s. For existing R-134a centrifugal chillers and commercial refrigeration equipment with substantial remaining service life, R-513A provides ~56% GWP reduction while preserving A1 safety classification, POE oil compatibility, and operational simplicity.

For new chiller equipment, the trend is toward lower-GWP alternatives. R-515B (A1, GWP 287) is increasingly the choice for new equipment where A1 safety is required; R-1234ze(E) (A2L, GWP 7) is the long-term low-GWP destination requiring A2L-rated chiller design.

For service technicians, R-513A work is operationally interchangeable with R-134a work. Same lubricant, same pressure envelope, same single-curve measurement procedures. The retrofit transition from R-134a to R-513A is the easiest of any major HFC retrofit.

11

Frequently asked

›What is the normal operating pressure of R-513A?

Very close to R-134a. At 70°F R-513A saturation is approximately 77 PSIG (CoolProp 7.2.0). Compare to R-134a at 70°F (71 PSIG) — R-513A is about 8% higher.

For typical chiller operation, the pressure delta is small enough that R-134a-rated equipment handles R-513A within design tolerances. Compressor and expansion-valve adjustments are typically not required.

›Can I retrofit R-134a to R-513A without oil change?

Yes — both refrigerants use POE oil. The R-134a POE oil is compatible with R-513A operation. Standard retrofit procedure: recover R-134a, replace filter-drier, evacuate to 500 microns, recharge R-513A by weight to OEM nameplate.

Verify oil condition. If POE is degraded, replace as part of the retrofit. But oil family compatibility is preserved across R-134a → R-513A transition — a major retrofit advantage.

›What does R-513A's GWP of 631 mean?

A 1 kg release of R-513A traps approximately 631 times more heat over 100 years than 1 kg of CO₂ (IPCC AR5, mass-weighted from 44% R-134a × 1430 + 56% R-1234yf × 4) [ipccar5]. The 631 figure represents a ~56% reduction from R-134a's 1430.

The reduction is significant but not low enough to clear EU F-Gas thresholds for the strictest chiller categories (where R-1234ze(E) at GWP 7 or R-515B at 287 is preferred). For most R-134a retrofit applications, R-513A's GWP positioning is adequate through the late 2020s.

›Does R-513A have temperature glide?

Essentially zero — the 44/56 composition is azeotropic. Service measurement procedures from R-134a practice (single saturation curve, no dew/bubble distinction) apply directly to R-513A without modification.

This is one of R-513A's primary retrofit advantages over zeotropic alternatives — no operational training adjustment needed for service technicians.

›What lubricant does R-513A use?

Polyolester (POE) oil — same lubricant family as R-134a [ahri700]. Typical viscosity is application-specific (chillers use ISO 32 or ISO 68 depending on compressor design). No oil change required for R-134a retrofit.

›What's the difference between R-513A and R-450A?

Both are A1 azeotropic HFC/HFO blends marketed as R-134a chiller retrofits. R-513A (Chemours Opteon XP10) is R-134a/R-1234yf 44/56, GWP 631. R-450A (Honeywell Solstice N13) is R-134a/R-1234ze(E) 42/58, GWP 605.

Performance is essentially equivalent. R-450A has slightly lower GWP and uses R-1234ze(E) instead of R-1234yf as the HFO diluent. The choice between them is typically driven by manufacturer relationship.

›Is R-513A safe to handle?

ASHRAE class A1 — non-toxic and non-flammable [ashrae34]. Standard HFC service procedures apply. No A2L-specific requirements.

›Can R-513A be used in new chillers?

Yes — Chemours and major chiller OEMs (Trane, Carrier, Johnson Controls, Daikin) offer R-513A new-equipment options. For maximum GWP reduction, new chillers increasingly specify R-1234ze(E) (A2L, GWP 7) or R-515B (A1, GWP 287); R-513A is the A1 retrofit-friendly option with moderate GWP reduction.

Download this dataset

Full PT chart for R-513A · 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
    Final Rule Oct 2021https://www.epa.gov/climate-hfcs-reduction
  4. [4]
    EU F-Gas Regulation 517/2014 (revised 2024)
    https://climate.ec.europa.eu/eu-action/fluorinated-greenhouse-gases_en
  5. [5]
    EPA SNAP — R-513A acceptable for chiller retrofit
    https://www.epa.gov/snap
  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 Opteon XP10 (R-513A) Product Data Sheet
    https://www.chemours.com/en/products/refrigerants

Data sources & provenance

PT chart
CoolProp 7.2.0 R513A.mix
Cross-checked against
CoolProp 7.2.0 (R513A.mix); Chemours Opteon XP10 datasheet
Properties
CoolProp 7.2.0 + ASHRAE Standard 34-2022
GWP
IPCC AR5 Table 8.A.1 (composition-weighted)
Generated
2026-06-05

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.