RefrigerantASHRAE R-450A

R450A PT Chart

Updated October 12, 2026

R-450A

A1 Lower toxicity, no flame propagationHFC/HFO 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^{[6], section 4.8}. Label: R-450A, safety class A1, GWP 601. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[6], section 4.7}.

R-134a/R-1234ze(E) (42/58)

Near-azeotropic R-134a/R-1234ze(E) blend (42/58 mass) marketed as Honeywell Solstice N13 — A1 safety, GWP 601 (~58% lower than R-134a), very small glide. The Honeywell alternative to Chemours R-513A for R-134a chiller retrofit.

R-450A saturation pressure splits across its glide: dew 28.9 PSIG at 40°F, bubble 109.3 PSIG at 100°F, and 60.6–62.0 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

62.0 / 60.6 PSIG

GWP (100-yr)

601 US EPA value, 40 CFR 84.64(b)

Temperature glide

1.1°F

Boiling point

bubble −10.5°F / dew −9.5°F

Sourced facts

ASHRAE safety class: A1^[1]
Composition (mass): 42% R-134a / 58% R-1234ze(E)^[1]
GWP (100-yr): 601
ODP: 0^[1]
Normal boiling point: bubble −10.5°F (−23.6°C), dew −9.5°F (−23.0°C)^[4]
Temperature glide: 1.1°F at a 40°F dew point^[4]
Lubricant: POE
Trade name: Solstice N13^[5]

R-450A PT calculator Superheat

R-450A PT chart — printable saturation table

Looking for the R-450A 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-450A PT Chart — Pressure-Temperature Saturation Table

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

R-450A · 1° increments · °F / PSIG

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

R-450A pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Bubble (PSIG)	Dew (PSIG)
−40°F	16.4 in. Hg vac.	16.8 in. Hg vac.
−39°F	16.0 in. Hg vac.	16.4 in. Hg vac.
−38°F	15.6 in. Hg vac.	16.0 in. Hg vac.
−37°F	15.1 in. Hg vac.	15.6 in. Hg vac.
−36°F	14.7 in. Hg vac.	15.2 in. Hg vac.
−35°F	14.3 in. Hg vac.	14.7 in. Hg vac.
−34°F	13.8 in. Hg vac.	14.3 in. Hg vac.
−33°F	13.4 in. Hg vac.	13.8 in. Hg vac.
−32°F	12.9 in. Hg vac.	13.4 in. Hg vac.
−31°F	12.4 in. Hg vac.	12.9 in. Hg vac.
−30°F	11.9 in. Hg vac.	12.4 in. Hg vac.
−29°F	11.4 in. Hg vac.	11.9 in. Hg vac.
−28°F	10.9 in. Hg vac.	11.4 in. Hg vac.
−27°F	10.4 in. Hg vac.	10.9 in. Hg vac.
−26°F	9.9 in. Hg vac.	10.4 in. Hg vac.
−25°F	9.3 in. Hg vac.	9.9 in. Hg vac.
−24°F	8.8 in. Hg vac.	9.3 in. Hg vac.
−23°F	8.2 in. Hg vac.	8.8 in. Hg vac.
−22°F	7.6 in. Hg vac.	8.2 in. Hg vac.
−21°F	7.0 in. Hg vac.	7.6 in. Hg vac.
−20°F	6.4 in. Hg vac.	7.0 in. Hg vac.
−19°F	5.8 in. Hg vac.	6.4 in. Hg vac.
−18°F	5.2 in. Hg vac.	5.8 in. Hg vac.
−17°F	4.5 in. Hg vac.	5.2 in. Hg vac.
−16°F	3.8 in. Hg vac.	4.5 in. Hg vac.
−15°F	3.2 in. Hg vac.	3.9 in. Hg vac.
−14°F	2.5 in. Hg vac.	3.2 in. Hg vac.
−13°F	1.8 in. Hg vac.	2.5 in. Hg vac.
−12°F	1.1 in. Hg vac.	1.8 in. Hg vac.
−11°F NBP (atmospheric)	0.3 in. Hg vac.	1.1 in. Hg vac.
−10°F	0.2	0.4 in. Hg vac.
−9°F	0.6	0.2
−8°F	0.9	0.5
−7°F	1.3	0.9
−6°F	1.7	1.3
−5°F	2.1	1.7
−4°F	2.5	2.1
−3°F	3.0	2.5
−2°F	3.4	2.9
−1°F	3.8	3.4
0°F	4.3	3.8
1°F	4.7	4.2
2°F	5.2	4.7
3°F	5.6	5.1
4°F	6.1	5.6
5°F	6.6	6.1
6°F	7.1	6.6
7°F	7.6	7.0
8°F	8.1	7.5
9°F	8.6	8.1
10°F	9.1	8.6
11°F	9.7	9.1
12°F	10.2	9.6
13°F	10.8	10.2
14°F	11.3	10.7
15°F	11.9	11.3
16°F	12.5	11.9
17°F	13.1	12.5
18°F	13.7	13.0
19°F	14.3	13.7
20°F	14.9	14.3
21°F	15.6	14.9
22°F	16.2	15.5
23°F	16.9	16.2
24°F	17.6	16.8
25°F	18.2	17.5
26°F	18.9	18.2
27°F	19.6	18.9
28°F	20.3	19.6
29°F	21.1	20.3
30°F	21.8	21.0
31°F	22.5	21.7
32°F H₂O freeze	23.3	22.5
33°F	24.1	23.2
34°F	24.8	24.0
35°F	25.6	24.8
36°F	26.4	25.6
37°F	27.3	26.4
38°F	28.1	27.2
39°F	28.9	28.0
40°F	29.8	28.9
41°F	30.7	29.7
42°F	31.5	30.6
43°F	32.4	31.5
44°F	33.4	32.3
45°F	34.3	33.3
46°F	35.2	34.2
47°F	36.2	35.1
48°F	37.1	36.1
49°F	38.1	37.0
50°F	39.1	38.0
51°F	40.1	39.0
52°F	41.1	40.0
53°F	42.1	41.0
54°F	43.2	42.0
55°F	44.2	43.1
56°F	45.3	44.1
57°F	46.4	45.2
58°F	47.5	46.3
59°F	48.6	47.4
60°F	49.8	48.5
61°F	50.9	49.6
62°F	52.1	50.8
63°F	53.3	52.0
64°F	54.5	53.1
65°F	55.7	54.3
66°F	56.9	55.5
67°F	58.2	56.8
68°F	59.4	58.0
69°F	60.7	59.3
70°F	62.0	60.6
71°F	63.3	61.9
72°F	64.6	63.2
73°F	66.0	64.5
74°F	67.4	65.8
75°F	68.7	67.2
76°F	70.1	68.6
77°F	71.6	70.0
78°F	73.0	71.4
79°F	74.4	72.8
80°F	75.9	74.3
81°F	77.4	75.7
82°F	78.9	77.2
83°F	80.4	78.7
84°F	82.0	80.3
85°F	83.5	81.8
86°F	85.1	83.4
87°F	86.7	84.9
88°F	88.3	86.5
89°F	90.0	88.2
90°F	91.6	89.8
91°F	93.3	91.5
92°F	95.0	93.1
93°F	96.7	94.8
94°F	98.5	96.6
95°F	100.2	98.3
96°F	102.0	100.0
97°F	103.8	101.8
98°F	105.6	103.6
99°F	107.5	105.4
100°F	109.3	107.3
101°F	111.2	109.1
102°F	113.1	111.0
103°F	115.0	112.9
104°F	117.0	114.9
105°F	118.9	116.8
106°F	120.9	118.8
107°F	123.0	120.8
108°F	125.0	122.8
109°F	127.0	124.8
110°F	129.1	126.9
111°F	131.2	129.0
112°F	133.4	131.1
113°F	135.5	133.2
114°F	137.7	135.3
115°F	139.9	137.5
116°F	142.1	139.7
117°F	144.3	141.9
118°F	146.6	144.2
119°F	148.9	146.4
120°F	151.2	148.7
121°F	153.5	151.1
122°F	155.9	153.4
123°F	158.3	155.8
124°F	160.7	158.2
125°F	163.1	160.6
126°F	165.6	163.0
127°F	168.1	165.5
128°F	170.6	168.0
129°F	173.2	170.5
130°F	175.7	173.0
131°F	178.3	175.6
132°F	180.9	178.2
133°F	183.6	180.8
134°F	186.2	183.5
135°F	188.9	186.2
136°F	191.7	188.9
137°F	194.4	191.6
138°F	197.2	194.4
139°F	200.0	197.2
140°F	202.8	200.0
141°F	205.7	202.8
142°F	208.6	205.7
143°F	211.5	208.6
144°F	214.5	211.5
145°F	217.4	214.5
146°F	220.4	217.5
147°F	223.5	220.5
148°F	226.5	223.5
149°F	229.6	226.6
150°F	232.8	229.7

R-450A pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Bubble (kPa)	Dew (kPa)
−40°C	−55	−57
−39°C	−53	−54
−38°C	−50	−52
−37°C	−48	−49
−36°C	−45	−47
−35°C	−42	−44
−34°C	−39	−41
−33°C	−36	−38
−32°C	−33	−35
−31°C	−29	−31
−30°C	−26	−28
−29°C	−22	−24
−28°C	−18	−21
−27°C	−14	−17
−26°C	−10	−13
−25°C	−6	−9
−24°C NBP (atmospheric)	−2	−4
−23°C	3	0
−22°C	8	5
−21°C	12	10
−20°C	18	15
−19°C	23	20
−18°C	28	25
−17°C	34	30
−16°C	39	36
−15°C	45	42
−14°C	52	48
−13°C	58	54
−12°C	64	61
−11°C	71	67
−10°C	78	74
−9°C	85	81
−8°C	93	88
−7°C	100	96
−6°C	108	104
−5°C	116	111
−4°C	125	120
−3°C	133	128
−2°C	142	137
−1°C	151	146
0°C H₂O freeze	161	155
1°C	170	164
2°C	180	174
3°C	190	184
4°C	201	194
5°C	211	205
6°C	222	216
7°C	234	227
8°C	245	238
9°C	257	250
10°C	269	262
11°C	282	274
12°C	295	287
13°C	308	300
14°C	322	313
15°C	335	327
16°C	350	341
17°C	364	355
18°C	379	370
19°C	394	385
20°C	410	400
21°C	426	416
22°C	442	432
23°C	459	448
24°C	476	465
25°C	493	482
26°C	511	500
27°C	530	518
28°C	548	537
29°C	567	556
30°C	587	575
31°C	607	594
32°C	627	615
33°C	648	635
34°C	669	656
35°C	691	678
36°C	713	700
37°C	736	722
38°C	759	745
39°C	782	768
40°C	807	792
41°C	831	816
42°C	856	841
43°C	882	866
44°C	908	892
45°C	934	918
46°C	961	945
47°C	989	972
48°C	1,017	1,000
49°C	1,046	1,029
50°C	1,075	1,058
51°C	1,105	1,087
52°C	1,135	1,117
53°C	1,166	1,148
54°C	1,197	1,179
55°C	1,229	1,211
56°C	1,262	1,243
57°C	1,295	1,276
58°C	1,329	1,310
59°C	1,364	1,344
60°C	1,399	1,379
61°C	1,434	1,414
62°C	1,471	1,450
63°C	1,507	1,487
64°C	1,545	1,524
65°C	1,583	1,562
66°C	1,622	1,601

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-450A 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^{[1], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-450A

Temp:°F

62.0 / 60.6PSIG(427 / 418 kPa)

Bubble Dew· zeotropic blend

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

Common service temperatures

32°F

23 / 22PSIG

Freezing

45°F

34 / 33PSIG

Heat-pump heat

70°F

62 / 61PSIG

Standard

75°F

69 / 67PSIG

Test ref

80°F

76 / 74PSIG

Warm

95°F

100 / 98PSIG

Summer peak

Saturation values from CoolProp 8.0.0 mixture model: R-134a/R-1234ze(E)^[4].

Equation-of-state and mixture-model references

Equation of state, R-134a: Tillner-Roth, R.; Baehr, H. D. An International Standard Formulation for the Thermodynamic Properties of 1,1,1,2-Tetrafluoroethane (HFC-134a) for Temperatures from 170 K to 455 K and Pressures up to 70 MPa. J. Phys. Chem. Ref. Data 23, 657–729 (1994). https://doi.org/10.1063/1.555958
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
Mixture model, R-134a/R-1234ze(E): Bell, I. H. Mixture Models for Refrigerants R-1234yf/134a, R-1234yf/1234ze(E), and R-134a/1234ze(E) and Interim Models for R-125/1234yf, R-1234ze(E)/227ea, and R-1234yf/152a. J. Phys. Chem. Ref. Data 51, 013103 (2022). https://doi.org/10.1063/5.0086060

At a glance

Chemistry

R-134a/R-1234ze(E) (42/58)

Binary HFC/HFO blend

Lubricant compatibility

POEMO

POE required. Lower-GWP R-134a alternative for medium-temp commercial refrigeration, chillers, and heat pumps. Low glide (~0.5 K).

Blend composition

R-134a 42.0%
R-1234ze(E) 58.0%

Trade names

Solstice N13 — Honeywell

Common applications

Medium-temperature commercial refrigeration
R-134a retrofit

Properties

Boiling point (1 atm)
bubble −10.5°F (−23.6°C), dew −9.5°F (−23.0°C)
Critical point
No single point — blend critical locus
Molar mass
108.70 g/mol
Temperature glide
1.1°F
ODP
0
GWP (100-yr)
601 US EPA value, 40 CFR 84.64(b) IPCC: AR4 not assessed · AR5 547 · AR6 643
New-equipment status (US)
Restricted in 20 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-450A?

R-450A is a near-azeotropic binary blend of 42% R-134a (HFC) and 58% R-1234ze(E) (HFO) by mass^[1]. The near-azeotropic composition produces very small temperature glide (~1.1°F) — use the dew column for superheat and the bubble column for subcooling.

R-450A was developed by Honeywell as a retrofit for R-134a centrifugal chillers and commercial refrigeration. The R-1234ze(E) component is different from R-513A's R-1234yf component but serves the same role: diluting the blend's overall GWP while preserving A1 safety classification and operational compatibility with R-134a equipment.

Where R-450A is used

R-134a centrifugal chiller retrofit
New chiller equipment installations where A1 classification is preferred

Regulatory & phase-down status

R-450A's GWP of 601 is below the 700-GWP limit for comfort-cooling chillers (40 CFR 84.54(a)(10)(i), (c)(3)). For chiller and commercial refrigeration applications, R-450A provides moderate GWP reduction with A1 safety preservation^[2]^[3].

Like R-513A, R-450A is a transitional refrigerant for R-134a equipment retrofit. New chiller equipment specifies R-515B (A1, GWP 287) or R-1234ze(E) (A2L, GWP 1) for lower GWP.

Service notes

A1 classification means no A2L procedures required.

Temperature glide

R-450A 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

Phase-down timeline

R-450A contains HFC-134a, a regulated substance under the AIM Act. Its GWP under 40 CFR 84.64 is 601, at or above the limit in 20 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-450A”).

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-450A →

US new-equipment rules (40 CFR 84.54)

R-450A contains HFC-134a, a regulated substance under the AIM Act. Under 40 CFR 84.64(b) its GWP is 601: 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.

All 84.54 categories restricting R-450A (20)^[2]

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-450A 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-450A equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant^[7].

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

Commercial refrigeration — medium temperature

Retrofit and replacement paths

R-450A replaces

R-134a A1 · GWP 1,430

Replacements for R-450A

Reading the R-450A PT chart — near-azeotropic

R-450A is near-azeotropic with very small glide (~1.1°F). The PT chart shows both bubble and dew curves.

For superheat measurement at the suction line, use the dew curve. For subcooling at the liquid line, use the bubble curve.

Service-equivalent to R-134a

R-450A's near-azeotropic behavior means R-134a service procedures apply. Same lubricant as R-134a — use the dew column for superheat and the bubble column for subcooling.

R-450A vs R-134a, R-1234yf, R-513A, R-516A: saturation pressure

Saturation pressure (PSIG, gauge) for R-450A vs R-134a, R-1234yf, R-513A, R-516A — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-450A. Sources: R-450A: CoolProp 8.0.0 dataset; R-134a, R-1234yf, R-513A and R-516A: CoolProp 7.2.0 dataset.
Temp	R-450A	R-134a	R-1234yf	R-513A	R-516A
0°F	3.8 / 4.3	6.5	9.2	9.4	9.2
40°F	28.9 / 29.8	35.0(+18%)	38.4(+29%)	39.8(+34%)	38.9(+31%)
70°F	60.6 / 62.0	71.1(+15%)	73.9(+19%)	77.2(+25%)	75.2(+21%)
100°F	107.3 / 109.3	124.2(+14%)	124.9(+14%)	131.4(+20%)	127.4(+17%)

Frequently asked

›What is the normal operating pressure of R-450A?

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

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

Both are A1 near-azeotropic HFC/HFO blends marketed as R-134a chiller retrofits. R-450A (Honeywell Solstice N13) uses R-134a/R-1234ze(E) 42/58, GWP 601, ~1.1°F glide. R-513A (Chemours Opteon XP10) uses R-134a/R-1234yf 44/56, GWP 630, azeotropic (~0°F glide).

R-450A has slightly lower GWP (601 vs 630) and uses R-1234ze(E) (lower vapor pressure than R-1234yf).

›What does R-450A's GWP of 601 mean?

A 1 kg release of R-450A traps approximately 601 times more heat over 100 years than 1 kg of CO₂ (mass-weighted from 42% R-134a × 1430 + 58% R-1234ze(E) × 1)^[2]. The 601 figure represents a ~58% reduction from R-134a's 1,430.

›Does R-450A have temperature glide?

Very small — approximately 1.1°F (dew minus bubble at 1 atm, from the PT dataset). The near-azeotropic composition means service measurement procedures from R-134a practice apply. Use the dew column for superheat and the bubble column for subcooling.

›What lubricant does R-450A use?

Polyolester (POE) oil — same lubricant family as R-134a.

›Is R-450A safe to handle?

ASHRAE safety group A1: lower toxicity and no flame propagation^[1]. No A2L-specific requirements.

›Why does R-450A use R-1234ze(E) instead of R-1234yf?

Different HFO has different vapor pressure profile. R-1234ze(E) has lower vapor pressure than R-1234yf (NBP −2°F vs −21°F), producing a different blend pressure envelope.

Honeywell selected R-1234ze(E) for the Solstice N13 product; Chemours selected R-1234yf for the Opteon XP10 product. Both serve the same retrofit application.

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Full PT chart for R-450A · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of Refrigerants (free read-only version). ASHRAE. 2022. https://www.ashrae.org/technical-resources/standards-and-guidelines/read-only-versions-of-ashrae-standards (accessed October 2, 2026)
[2]
40 CFR 84.54 — Restrictions on the use of hydrofluorocarbons. eCFR (Office of the Federal Register). up to date as of 9/29/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-B/section-84.54 (accessed October 2, 2026)
[3]
Regulation (EU) No 517/2014 on fluorinated greenhouse gases. EUR-Lex. OJ L 150, 20.5.2014 (replaced by (EU) 2024/573 from March 11, 2024). https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32014R0517 (accessed October 2, 2026)
[4]
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
[5]
Honeywell Solstice N13 (R-450A) Technical Information. Honeywell. https://www.honeywell-refrigerants.com/americas/ (accessed October 2, 2026)
[6]
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)
[7]
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

R-450A PT chart — printable saturation table

R-450A PT Chart — Pressure-Temperature Saturation Table

Saturation pressure-temperature curve

At a glance

Chemistry

Lubricant compatibility

Blend composition

Trade names

Common applications

Properties

What is R-450A?

Where R-450A is used

Regulatory & phase-down status

Service notes

Temperature glide

Operating cycle

Phase-down timeline

US new-equipment rules (40 CFR 84.54)

Global warming potential, in context

Retrofit and replacement paths

R-450A replaces

Replacements for R-450A

More on R-450A

Calculators

Guides

R-450A vs R-134a, R-1234yf, R-513A, R-516A: saturation pressure

Frequently asked

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Sources & citations