RefrigerantASHRAE R-515A

R515A PT Chart

Updated October 19, 2026

R-515A

A1 Lower toxicity, no flame propagationHFO blend AIM Act HFC

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-515A, safety class A1, GWP 387. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[1], section 4.7}.

R-1234ze(E)/R-227ea (88/12)

Binary HFO/HFC near-azeotropic blend — 88% R-1234ze(E) and 12% R-227ea. A Honeywell development blend (designated Solstice 515A) with no current commercial product — the marketed member of this R-1234ze(E)/R-227ea family is R-515B (Solstice N15). ASHRAE A1 (non-flammable — the R-227ea addition pulls the blend to A1 from the pure R-1234ze(E) A2L). GWP 387. R-134a replacement chemistry for chillers and commercial refrigeration where A1 classification is required.

R-515A saturation pressure is 22.1 PSIG at 40°F, 49.4 PSIG at 70°F, and 89.8 PSIG at 100°F. These are the gauge readings on a static, fully-saturated system; a running system's high side sits well above them. 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

49.4 PSIG

GWP (100-yr)

387 US EPA value, 40 CFR 84.64(b)

Temperature glide

under 0.1°F

Boiling point

−2.1°F

Sourced facts

Temperature glide: under 0.1°F at a 40°F dew point^[3]

R-515A PT calculator Superheat

R-515A PT chart — printable saturation table

Looking for the R-515A 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-515A PT Chart — Pressure-Temperature Saturation Table

Computed with CoolProp 8.0.0 in 1°F steps · hvacptcharts.com

R-515A · 1° increments · °F / PSIG

Tinted rows: NBP atmospheric crossover · 32°F H₂O freeze

R-515A pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	19.1 in. Hg vac.
−39°F	18.8 in. Hg vac.
−38°F	18.4 in. Hg vac.
−37°F	18.1 in. Hg vac.
−36°F	17.8 in. Hg vac.
−35°F	17.4 in. Hg vac.
−34°F	17.0 in. Hg vac.
−33°F	16.7 in. Hg vac.
−32°F	16.3 in. Hg vac.
−31°F	15.9 in. Hg vac.
−30°F	15.5 in. Hg vac.
−29°F	15.1 in. Hg vac.
−28°F	14.7 in. Hg vac.
−27°F	14.2 in. Hg vac.
−26°F	13.8 in. Hg vac.
−25°F	13.3 in. Hg vac.
−24°F	12.9 in. Hg vac.
−23°F	12.4 in. Hg vac.
−22°F	11.9 in. Hg vac.
−21°F	11.4 in. Hg vac.
−20°F	10.9 in. Hg vac.
−19°F	10.4 in. Hg vac.
−18°F	9.9 in. Hg vac.
−17°F	9.4 in. Hg vac.
−16°F	8.8 in. Hg vac.
−15°F	8.3 in. Hg vac.
−14°F	7.7 in. Hg vac.
−13°F	7.1 in. Hg vac.
−12°F	6.5 in. Hg vac.
−11°F	5.9 in. Hg vac.
−10°F	5.3 in. Hg vac.
−9°F	4.7 in. Hg vac.
−8°F	4.1 in. Hg vac.
−7°F	3.4 in. Hg vac.
−6°F	2.7 in. Hg vac.
−5°F	2.1 in. Hg vac.
−4°F	1.4 in. Hg vac.
−3°F	0.7 in. Hg vac.
−2°F NBP (atmospheric)	0.0
−1°F	0.4
0°F	0.7
1°F	1.1
2°F	1.5
3°F	1.9
4°F	2.3
5°F	2.7
6°F	3.1
7°F	3.5
8°F	3.9
9°F	4.4
10°F	4.8
11°F	5.3
12°F	5.7
13°F	6.2
14°F	6.7
15°F	7.1
16°F	7.6
17°F	8.1
18°F	8.6
19°F	9.1
20°F	9.7
21°F	10.2
22°F	10.7
23°F	11.3
24°F	11.8
25°F	12.4
26°F	13.0
27°F	13.6
28°F	14.2
29°F	14.8
30°F	15.4
31°F	16.0
32°F H₂O freeze	16.7
33°F	17.3
34°F	18.0
35°F	18.6
36°F	19.3
37°F	20.0
38°F	20.7
39°F	21.4
40°F	22.1
41°F	22.9
42°F	23.6
43°F	24.4
44°F	25.1
45°F	25.9
46°F	26.7
47°F	27.5
48°F	28.3
49°F	29.1
50°F	30.0
51°F	30.8
52°F	31.7
53°F	32.6
54°F	33.4
55°F	34.3
56°F	35.3
57°F	36.2
58°F	37.1
59°F	38.1
60°F	39.0
61°F	40.0
62°F	41.0
63°F	42.0
64°F	43.0
65°F	44.1
66°F	45.1
67°F	46.2
68°F	47.2
69°F	48.3
70°F	49.4
71°F	50.5
72°F	51.7
73°F	52.8
74°F	54.0
75°F	55.2
76°F	56.3
77°F	57.6
78°F	58.8
79°F	60.0
80°F	61.3
81°F	62.5
82°F	63.8
83°F	65.1
84°F	66.4
85°F	67.8
86°F	69.1
87°F	70.5
88°F	71.9
89°F	73.3
90°F	74.7
91°F	76.1
92°F	77.6
93°F	79.1
94°F	80.5
95°F	82.0
96°F	83.6
97°F	85.1
98°F	86.7
99°F	88.2
100°F	89.8
101°F	91.5
102°F	93.1
103°F	94.7
104°F	96.4
105°F	98.1
106°F	99.8
107°F	101.5
108°F	103.3
109°F	105.1
110°F	106.8
111°F	108.7
112°F	110.5
113°F	112.3
114°F	114.2
115°F	116.1
116°F	118.0
117°F	119.9
118°F	121.9
119°F	123.8
120°F	125.8
121°F	127.9
122°F	129.9
123°F	132.0
124°F	134.0
125°F	136.1
126°F	138.3
127°F	140.4
128°F	142.6
129°F	144.8
130°F	147.0
131°F	149.2
132°F	151.5
133°F	153.8
134°F	156.1
135°F	158.4
136°F	160.8
137°F	163.1
138°F	165.5
139°F	168.0
140°F	170.4
141°F	172.9
142°F	175.4
143°F	177.9
144°F	180.5
145°F	183.1
146°F	185.7
147°F	188.3
148°F	190.9
149°F	193.6
150°F	196.3

R-515A pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	−65
−39°C	−63
−38°C	−61
−37°C	−58
−36°C	−56
−35°C	−54
−34°C	−51
−33°C	−49
−32°C	−46
−31°C	−43
−30°C	−40
−29°C	−37
−28°C	−34
−27°C	−31
−26°C	−28
−25°C	−24
−24°C	−21
−23°C	−17
−22°C	−13
−21°C	−9
−20°C	−5
−19°C NBP (atmospheric)	0
−18°C	4
−17°C	9
−16°C	14
−15°C	19
−14°C	24
−13°C	29
−12°C	34
−11°C	40
−10°C	46
−9°C	52
−8°C	58
−7°C	64
−6°C	71
−5°C	78
−4°C	85
−3°C	92
−2°C	99
−1°C	107
0°C H₂O freeze	115
1°C	123
2°C	131
3°C	140
4°C	149
5°C	158
6°C	167
7°C	177
8°C	186
9°C	196
10°C	207
11°C	217
12°C	228
13°C	239
14°C	251
15°C	262
16°C	275
17°C	287
18°C	299
19°C	312
20°C	326
21°C	339
22°C	353
23°C	367
24°C	382
25°C	397
26°C	412
27°C	428
28°C	444
29°C	460
30°C	477
31°C	494
32°C	511
33°C	529
34°C	547
35°C	566
36°C	585
37°C	604
38°C	624
39°C	644
40°C	665
41°C	686
42°C	707
43°C	729
44°C	752
45°C	774
46°C	798
47°C	821
48°C	846
49°C	870
50°C	896
51°C	921
52°C	947
53°C	974
54°C	1,001
55°C	1,029
56°C	1,057
57°C	1,086
58°C	1,115
59°C	1,145
60°C	1,175
61°C	1,206
62°C	1,237
63°C	1,269
64°C	1,302
65°C	1,335
66°C	1,369

CoolProp 8.0.0 · 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-515A PT chart data: CoolProp 8.0.0 (published Helmholtz equations of state / mixture models — see the source citations above).

Lower toxicity, no flame propagation

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.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-515A

Temp:°F

49.4PSIG(341 kPa)

Range: −40 to 150°F Open full PT calculator →

Common service temperatures

32°F

17PSIG

Freezing

45°F

26PSIG

Heat-pump heat

70°F

49PSIG

Standard

75°F

55PSIG

Test ref

80°F

61PSIG

Warm

95°F

82PSIG

Summer peak

Saturation values from CoolProp 8.0.0 mixture model: R-1234ze(E)/R-227ea^[3].

Equation-of-state and mixture-model references

Equation of state, R-1234ze(E): Thol, M.; Lemmon, E. W. Equation of State for the Thermodynamic Properties of trans-1,3,3,3-Tetrafluoropropene [R-1234ze(E)]. Int. J. Thermophys. 37, 28 (2016). https://doi.org/10.1007/s10765-016-2040-6
Equation of state, R-227ea: Lemmon, E. W.; Span, R. Thermodynamic Properties of R-227ea, R-365mfc, R-115, and R-13I1. J. Chem. Eng. Data 60, 3745–3758 (2015). https://doi.org/10.1021/acs.jced.5b00684
Mixture model, R-1234ze(E)/R-227ea: Bell, I. H. Mixture Model for Refrigerant Pairs R-32/1234yf, R-32/1234ze(E), R-1234ze(E)/227ea, R-1234yf/152a, and R-125/1234yf. J. Phys. Chem. Ref. Data 52, 013101 (2023). https://doi.org/10.1063/5.0135368

At a glance

Chemistry

R-1234ze(E)/R-227ea (88/12)

Binary HFO/HFC azeotropic blend

Lubricant compatibility

POEPVEMO

Near-azeotropic. A1 (non-flammable) — unlike pure R-1234ze(E) which is A2L. R-227ea addition shifts the blend to A1 classification.

Blend composition

R-1234ze(E) 88.0%
R-227ea 12.0%

Common applications

Centrifugal chillers
Medium-temperature commercial refrigeration
R-134a / R-1234ze retrofit where A1 is required

Properties

Boiling point (1 atm)
bubble −2.1°F (−18.9°C), dew −2.1°F (−18.9°C)
Critical point
No single point — blend critical locus
Molar mass
119.00 g/mol
Temperature glide
under 0.1°F
ODP
0
GWP (100-yr)
387 US EPA value, 40 CFR 84.64(b) IPCC: AR4 not assessed · AR5 403 · AR6 433
New-equipment status (US)
Restricted in 20 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-515A?

R-515A is engineered to solve a specific service problem: pure R-1234ze(E) has GWP 1 (US EPA basis, 40 CFR 84.64; ≈1 under strict AR5) and is well-suited as a long-term R-134a replacement, but it's A2L (lower flammability). For chiller and commercial refrigeration applications where A2L equipment and procedures aren't available (or aren't acceptable in the regulatory environment), R-1234ze(E) alone isn't a path. R-515A adds 12% R-227ea (heptafluoropropane, a non-flammable A1 HFC with GWP 3,220) to the R-1234ze(E) base, raising the blend's overall flammability classification to A1.

The blend is near-azeotropic — temperature glide is effectively zero — making R-515A a candidate for R-134a service from a glide-handling standpoint. Its pressure envelope is close to R-134a's, so R-515A can be charged into R-134a-designed equipment with minimal compressor adjustment.

The tradeoff vs pure R-1234ze(E): R-515A's GWP of 387 is substantially higher than R-1234ze(E)'s 1 (US EPA basis, 40 CFR 84.64, or ≈1 under strict AR5) — the R-227ea component (GWP 3,220) drives most of R-515A's GWP. R-515A is positioned as an interim solution: lower GWP than R-134a (387 vs 1,430), A1 safety class preserved, but not as low GWP as pure R-1234ze(E) alone.

Where R-515A is used

Centrifugal chillers (R-134a replacement where A1 is required by code or operator preference)
Medium-temperature commercial refrigeration (R-134a replacement)
Heat pumps (some commercial applications)
Service refrigerant for legacy R-134a equipment seeking GWP reduction without flammability classification change

Regulatory & phase-down status

R-515A's GWP of 387 is above the 150-GWP threshold that Regulation (EU) No 517/2014 Annex III sets for some commercial refrigeration. In the US, whether R-515A meets a given 40 CFR 84.54 limit depends on the equipment category — see the US new-equipment rules section on this page.

For very-low-GWP applications (where 150-GWP thresholds apply), R-515B (R-1234ze(E)/R-227ea 91.1/8.9, GWP 287) or pure R-1234ze(E) (GWP ≈1, A2L) are the appropriate alternatives. R-515A occupies the middle ground — substantial GWP reduction from R-134a, A1 safety preserved, modest performance penalty.

Service notes

POE and PVE oils are compatible. Mineral oil is not used. A1 safety classification simplifies service vs A2L alternatives — no A2L-specific procedures (flame restrictions, ventilation interlocks) are required.

Near-azeotropic behavior (effectively zero glide) means you use the dew column for superheat and the bubble column for subcooling. EPA Section 608 Universal or appropriate-type certification covers R-515A handling.

Operating cycle

Phase-down timeline

R-515A contains HFC-227ea, a regulated substance under the AIM Act. Its GWP under 40 CFR 84.64 is 387, at or above the limit in 20 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-515A”).

R-515A is not restricted in new chillers (its 84.64 GWP 387 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-515A →

US new-equipment rules (40 CFR 84.54)

R-515A contains HFC-227ea, a regulated substance under the AIM Act. Under 40 CFR 84.64(b) its GWP is 387: 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 (387) is under every 40 CFR 84.54 limit for chillers, so those restrictions don't apply there.

Not restricted in new chillers.

All 84.54 categories restricting R-515A (20)

Refrigeration, air conditioning & heat pumps (13)
January 1, 2025	Household refrigerators and freezers	GWP ≥ 150	(a)(3)
January 1, 2025	Retail food refrigeration — stand-alone units	GWP ≥ 150	(a)(4)
January 1, 2025	Vending machines	GWP ≥ 150	(a)(5)
January 1, 2026	Industrial 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, 2026	Industrial 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, 2026	Ice makers — batch type up to 1,000 lb of ice per 24 h and continuous type up to 1,200 lb per 24 h	GWP ≥ 150	(a)(8)(i)
January 1, 2026	Industrial 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 cascade	GWP ≥ 150	(c)(10)(i)
January 1, 2026	Industrial 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, 2026	Industrial process refrigeration — high-temperature side of cascade systems, evaporator inlet warmer than −22°F (−30°C)	GWP ≥ 300	(c)(10)(iii)
January 1, 2027	Refrigerated food processing and dispensing products outside the scope of UL 621, charge 500 g or less	GWP ≥ 150	(a)(9)(i)
January 1, 2032	Retail food refrigeration — remote condensing units	GWP ≥ 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, 2032	Supermarket systems	GWP ≥ 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, 2032	Cold storage warehouse systems	GWP ≥ 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, 2024	Motor 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 2028	Motor 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 upfitters	GWP ≥ 150	(a)(13)(ii)
January 1, 2028	Motor 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, 2025	Foam 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 foam	GWP ≥ 150	(a)(14)
January 1, 2026	Foam products in the (a)(14) formulations for use in space and military applications	GWP ≥ 150	(a)(15)
Aerosol propellants / solvents (2)
January 1, 2025	Aerosol products	GWP ≥ 150	(a)(16)(i)
January 1, 2028	Aerosol 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-515A 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-515A 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

Medium-pressure centrifugal & screw chillers

Retrofit and replacement paths

R-515A replaces

R-134a A1 · GWP 1,430

R-515A vs R-134a: saturation pressure

Saturation pressure (PSIG, gauge) for R-515A vs R-134a. Each column shows the percent difference from R-515A. Sources: R-515A: CoolProp 8.0.0 dataset; R-134a: CoolProp 7.2.0 dataset.
Temp	R-515A	R-134a
0°F	0.7	6.5
40°F	22.1	35.0(+58%)
70°F	49.4	71.1(+44%)
100°F	89.8	124.2(+38%)

Frequently asked

›Why mix R-1234ze(E) with R-227ea if R-1234ze(E) alone is lower-GWP?

To get A1 (non-flammable) safety classification. Pure R-1234ze(E) is A2L (lower flammability) — requires A2L-listed equipment, refrigerant detection where the standard requires it, machine-room ventilation provisions. Adding 12% R-227ea (A1, non-flammable) pulls the blend's flammability characteristics below the A2L threshold, achieving A1 classification. The cost is GWP (R-227ea is GWP 3,220) — but the blend's overall GWP (387) is still 73% lower than R-134a's. R-515A is the "we accept some GWP for A1 simplicity" point on the design curve.

›What is the GWP of R-515A?

387, mass-weighted from R-1234ze(E) (1) at 88% and R-227ea (3,220) at 12%. The R-227ea component dominates the GWP — it's only 12% of the blend by mass but contributes ~98% of the GWP. This is the inherent tradeoff: small amounts of high-GWP R-227ea to achieve A1 classification create disproportionate GWP burden.

›What's the difference between R-515A and R-515B?

Both are near-azeotropic R-1234ze(E)/R-227ea blends. R-515A is 88/12 (GWP 387); R-515B is 91.1/8.9 (GWP 287). R-515B has lower GWP because of less R-227ea content. Both are A1; both target R-134a replacement. R-515B is more aggressive on GWP reduction; R-515A has slightly more headroom on the flammability margin. R-515B is the commercially marketed product (Solstice N15); R-515A (the earlier, higher-R-227ea formulation, designated Solstice 515A) remained a Honeywell development blend without a current commercial product.

›Is R-515A subject to phase-down?

R-515A's GWP of 387 is above the EU F-Gas 150-GWP threshold for some commercial refrigeration, so lower-GWP alternatives (R-515B, R-1234ze(E), R-454C) are used where that threshold applies. For its US 40 CFR 84.54 status by equipment category, see the US new-equipment rules section on this page.

›What lubricant does R-515A use?

Polyolester (POE) oil is the primary recommendation. Polyvinyl ether (PVE) oil is also approved by Honeywell. Mineral oil and alkylbenzene are NOT compatible.

Download this dataset

Full PT chart for R-515A · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[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]
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]
CoolProp 8.0.0. 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