RefrigerantASHRAE R-365mfc

R365mfc PT Chart

Updated October 12, 2026

R-365mfc

A2 Lower toxicity, flammableHFC (pure) 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-365mfc, safety class A2, GWP 794. Red band on the shoulder: AHRI Guideline N-2017 calls for one on containers of flammable refrigerants^{[1], section 4.7}.

CF3CH2CF2CH3

Pure HFC, 1,1,1,3,3-pentafluorobutane (CF₃CH₂CF₂CH₃). Solvay Solkane 365mfc. ASHRAE A2 (flammable, not the milder A2L). GWP 794. Normal boiling +104°F — very high for a refrigerant. Primarily a foam blowing agent for polyurethane insulation; limited refrigeration use.

R-365mfc saturation pressure is 23.1 in. Hg vacuum at 40°F, 15.6 in. Hg vacuum at 70°F, and 2.5 in. Hg vacuum 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 −29°F to 150°F in 1°F steps.

Not yet checked against an independent source.

Saturation @ 70°F

15.6 in. Hg vac.

GWP (100-yr)

794 AIM Act exchange value (IPCC AR4)

Boiling point

104.3°F

R-365mfc PT calculator Superheat

R-365mfc PT chart — printable saturation table

Looking for the R-365mfc 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-365mfc PT Chart — Pressure-Temperature Saturation Table

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

R-365mfc · 1° increments · °F / PSIG

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

R-365mfc pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−29°F	29.2 in. Hg vac.
−28°F	29.1 in. Hg vac.
−27°F	29.1 in. Hg vac.
−26°F	29.1 in. Hg vac.
−25°F	29.1 in. Hg vac.
−24°F	29.0 in. Hg vac.
−23°F	29.0 in. Hg vac.
−22°F	29.0 in. Hg vac.
−21°F	28.9 in. Hg vac.
−20°F	28.9 in. Hg vac.
−19°F	28.8 in. Hg vac.
−18°F	28.8 in. Hg vac.
−17°F	28.8 in. Hg vac.
−16°F	28.7 in. Hg vac.
−15°F	28.7 in. Hg vac.
−14°F	28.6 in. Hg vac.
−13°F	28.6 in. Hg vac.
−12°F	28.5 in. Hg vac.
−11°F	28.5 in. Hg vac.
−10°F	28.4 in. Hg vac.
−9°F	28.4 in. Hg vac.
−8°F	28.3 in. Hg vac.
−7°F	28.3 in. Hg vac.
−6°F	28.2 in. Hg vac.
−5°F	28.2 in. Hg vac.
−4°F	28.1 in. Hg vac.
−3°F	28.0 in. Hg vac.
−2°F	28.0 in. Hg vac.
−1°F	27.9 in. Hg vac.
0°F	27.8 in. Hg vac.
1°F	27.8 in. Hg vac.
2°F	27.7 in. Hg vac.
3°F	27.6 in. Hg vac.
4°F	27.6 in. Hg vac.
5°F	27.5 in. Hg vac.
6°F	27.4 in. Hg vac.
7°F	27.3 in. Hg vac.
8°F	27.2 in. Hg vac.
9°F	27.2 in. Hg vac.
10°F	27.1 in. Hg vac.
11°F	27.0 in. Hg vac.
12°F	26.9 in. Hg vac.
13°F	26.8 in. Hg vac.
14°F	26.7 in. Hg vac.
15°F	26.6 in. Hg vac.
16°F	26.5 in. Hg vac.
17°F	26.4 in. Hg vac.
18°F	26.3 in. Hg vac.
19°F	26.2 in. Hg vac.
20°F	26.1 in. Hg vac.
21°F	25.9 in. Hg vac.
22°F	25.8 in. Hg vac.
23°F	25.7 in. Hg vac.
24°F	25.6 in. Hg vac.
25°F	25.5 in. Hg vac.
26°F	25.3 in. Hg vac.
27°F	25.2 in. Hg vac.
28°F	25.1 in. Hg vac.
29°F	24.9 in. Hg vac.
30°F	24.8 in. Hg vac.
31°F	24.6 in. Hg vac.
32°F H₂O freeze	24.5 in. Hg vac.
33°F	24.3 in. Hg vac.
34°F	24.2 in. Hg vac.
35°F	24.0 in. Hg vac.
36°F	23.8 in. Hg vac.
37°F	23.7 in. Hg vac.
38°F	23.5 in. Hg vac.
39°F	23.3 in. Hg vac.
40°F	23.1 in. Hg vac.
41°F	23.0 in. Hg vac.
42°F	22.8 in. Hg vac.
43°F	22.6 in. Hg vac.
44°F	22.4 in. Hg vac.
45°F	22.2 in. Hg vac.
46°F	22.0 in. Hg vac.
47°F	21.8 in. Hg vac.
48°F	21.6 in. Hg vac.
49°F	21.4 in. Hg vac.
50°F	21.1 in. Hg vac.
51°F	20.9 in. Hg vac.
52°F	20.7 in. Hg vac.
53°F	20.4 in. Hg vac.
54°F	20.2 in. Hg vac.
55°F	20.0 in. Hg vac.
56°F	19.7 in. Hg vac.
57°F	19.4 in. Hg vac.
58°F	19.2 in. Hg vac.
59°F	18.9 in. Hg vac.
60°F	18.7 in. Hg vac.
61°F	18.4 in. Hg vac.
62°F	18.1 in. Hg vac.
63°F	17.8 in. Hg vac.
64°F	17.5 in. Hg vac.
65°F	17.2 in. Hg vac.
66°F	16.9 in. Hg vac.
67°F	16.6 in. Hg vac.
68°F	16.3 in. Hg vac.
69°F	16.0 in. Hg vac.
70°F	15.6 in. Hg vac.
71°F	15.3 in. Hg vac.
72°F	15.0 in. Hg vac.
73°F	14.6 in. Hg vac.
74°F	14.3 in. Hg vac.
75°F	13.9 in. Hg vac.
76°F	13.5 in. Hg vac.
77°F	13.2 in. Hg vac.
78°F	12.8 in. Hg vac.
79°F	12.4 in. Hg vac.
80°F	12.0 in. Hg vac.
81°F	11.6 in. Hg vac.
82°F	11.2 in. Hg vac.
83°F	10.8 in. Hg vac.
84°F	10.3 in. Hg vac.
85°F	9.9 in. Hg vac.
86°F	9.5 in. Hg vac.
87°F	9.0 in. Hg vac.
88°F	8.6 in. Hg vac.
89°F	8.1 in. Hg vac.
90°F	7.7 in. Hg vac.
91°F	7.2 in. Hg vac.
92°F	6.7 in. Hg vac.
93°F	6.2 in. Hg vac.
94°F	5.7 in. Hg vac.
95°F	5.2 in. Hg vac.
96°F	4.7 in. Hg vac.
97°F	4.1 in. Hg vac.
98°F	3.6 in. Hg vac.
99°F	3.1 in. Hg vac.
100°F	2.5 in. Hg vac.
101°F	1.9 in. Hg vac.
102°F	1.4 in. Hg vac.
103°F	0.8 in. Hg vac.
104°F NBP (atmospheric)	0.2 in. Hg vac.
105°F	0.2
106°F	0.5
107°F	0.8
108°F	1.1
109°F	1.4
110°F	1.7
111°F	2.1
112°F	2.4
113°F	2.7
114°F	3.1
115°F	3.4
116°F	3.7
117°F	4.1
118°F	4.5
119°F	4.8
120°F	5.2
121°F	5.6
122°F	6.0
123°F	6.3
124°F	6.7
125°F	7.1
126°F	7.5
127°F	7.9
128°F	8.4
129°F	8.8
130°F	9.2
131°F	9.6
132°F	10.1
133°F	10.5
134°F	11.0
135°F	11.4
136°F	11.9
137°F	12.4
138°F	12.8
139°F	13.3
140°F	13.8
141°F	14.3
142°F	14.8
143°F	15.3
144°F	15.8
145°F	16.4
146°F	16.9
147°F	17.4
148°F	18.0
149°F	18.5
150°F	19.1

R-365mfc pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−33°C	−99
−32°C	−98
−31°C	−98
−30°C	−98
−29°C	−98
−28°C	−98
−27°C	−97
−26°C	−97
−25°C	−97
−24°C	−96
−23°C	−96
−22°C	−96
−21°C	−96
−20°C	−95
−19°C	−95
−18°C	−94
−17°C	−94
−16°C	−94
−15°C	−93
−14°C	−93
−13°C	−92
−12°C	−92
−11°C	−91
−10°C	−90
−9°C	−90
−8°C	−89
−7°C	−88
−6°C	−88
−5°C	−87
−4°C	−86
−3°C	−85
−2°C	−85
−1°C	−84
0°C H₂O freeze	−83
1°C	−82
2°C	−81
3°C	−80
4°C	−79
5°C	−78
6°C	−77
7°C	−75
8°C	−74
9°C	−73
10°C	−72
11°C	−70
12°C	−69
13°C	−67
14°C	−66
15°C	−64
16°C	−62
17°C	−61
18°C	−59
19°C	−57
20°C	−55
21°C	−53
22°C	−51
23°C	−49
24°C	−47
25°C	−45
26°C	−42
27°C	−40
28°C	−37
29°C	−35
30°C	−32
31°C	−29
32°C	−27
33°C	−24
34°C	−21
35°C	−18
36°C	−14
37°C	−11
38°C	−8
39°C	−4
40°C NBP (atmospheric)	−1
41°C	3
42°C	7
43°C	11
44°C	15
45°C	19
46°C	23
47°C	27
48°C	32
49°C	36
50°C	41
51°C	46
52°C	51
53°C	56
54°C	61
55°C	66
56°C	72
57°C	78
58°C	83
59°C	89
60°C	95
61°C	101
62°C	108
63°C	114
64°C	121
65°C	128
66°C	135

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-365mfc PT chart data: CoolProp 7.2.0 (published Helmholtz equations of state / mixture models — see the source citations above).

Lower toxicity, flammable

Lower toxicity. Flame propagates in air at 60°C with a burning velocity between 10 and 100 cm/s. Less common in HVAC. R-152a and R-365mfc are A2.

Flammability: Yes (10 ≤ burning velocity ≤ 100 cm/s)
Toxicity: Lower

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

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-365mfc

Temp:°F

−7.7PSIG(−53 kPa)

Range: −29 to 150°F Open full PT calculator →

Common service temperatures

32°F

−12PSIG

Freezing

45°F

−11PSIG

Heat-pump heat

70°F

−8PSIG

Standard

75°F

−7PSIG

Test ref

80°F

−6PSIG

Warm

95°F

−3PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[3]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

CF3CH2CF2CH3

1,1,1,3,3-Pentafluorobutane

Lubricant compatibility

POEMO

Class A2 (flammable). Primarily used as a foam blowing agent for polyurethane insulation. Limited refrigeration use.

Trade names

Solkane 365mfc — Solvay

Common applications

Foam blowing agent (polyurethane insulation)
Solvent applications
Limited refrigeration use

Properties

Boiling point (1 atm)
104.3°F (40.2°C)
Critical point
368.3°F (186.9°C) at 459 PSIG
Molar mass
148.07 g/mol
ODP
0
GWP (100-yr)
794 AIM Act exchange value (IPCC AR4) IPCC: AR4 794 · AR5 804 · AR6 914
Atmospheric lifetime
8.7 years
New-equipment status (US)
Restricted in 39 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-365mfc?

R-365mfc is 1,1,1,3,3-pentafluorobutane — a four-carbon HFC with five fluorines. The notable physical property is the high normal boiling point of +104°F (40°C) — well above ambient temperatures, meaning the refrigerant is liquid at most operating environments. This places it in a different class than typical AC and refrigeration refrigerants (NBP −50°F to +0°F).

The A2 safety classification (flammable, not the milder A2L) reflects the saturated four-carbon backbone — like other hydrocarbons of similar size, R-365mfc supports combustion, though less aggressively than pure hydrocarbon refrigerants (R-290, R-600a). The combination of high boiling point + flammability makes R-365mfc a poor choice for typical HVAC refrigeration but useful for foam-blowing applications where the high boiling point allows liquid storage at ambient and the flammability is managed through controlled-environment manufacturing.

Where R-365mfc is used

Foam blowing agent for polyurethane insulation (marketed as Solvay Solkane 365mfc)
Solvent applications in some precision-cleaning processes
Some specialty high-temperature heat-pump and ORC research applications
Not used in conventional HVAC refrigeration

Regulatory & phase-down status

R-365mfc's GWP of 794 places it within AIM Act phase-down scope and EU F-Gas Regulation scope. For foam-blowing applications the regulatory pressure has been intense — the EU F-Gas Regulation specifically targeted foam-blowing HFCs as one of the highest-emission HFC use categories.

The foam-blowing industry transition has progressed substantially: R-1233zd(E) (Honeywell Solstice LBA, A1, GWP 4) is a modern foam-blowing HFO for polyurethane spray and rigid foam applications. R-365mfc is retained in some specific foam formulations where its specific volatility profile is preferred, but the trajectory is toward lower-GWP alternatives.

Service notes

Foam-blowing applications involve refrigerant handling at the foam-manufacturing facility rather than in HVAC equipment service. The A2 flammability classification requires appropriate handling — flammable refrigerant storage and transfer procedures apply, with EPA Section 608 covering refrigeration applications.

POE oil is compatible for any refrigeration use; mineral oil is not.

Operating cycle

Phase-down timeline

R-365mfc is a regulated substance under the AIM Act. Its GWP under 40 CFR 84.64 is 794, at or above the limit in 39 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-365mfc”).

From January 1, 2025 — new 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: manufacture / import restricted (GWP ≥ 150).
From January 1, 2026 — new foam products in the (a)(14) formulations for use in space and military applications: manufacture / import restricted (GWP ≥ 150).
From January 1, 2028 — new 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: sale and distribution restricted (GWP ≥ 150).

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-365mfc →

US new-equipment rules (40 CFR 84.54)

R-365mfc is a regulated substance under the AIM Act. Under 40 CFR 84.64(a) its GWP is 794, the AIM Act exchange value. That value is compared against each 40 CFR 84.54 subsector limit below.

Effective	Equipment subsector	Limit	Restriction	¶
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	Manufacture / import	(a)(14)
January 1, 2026	Foam products in the (a)(14) formulations for use in space and military applications	GWP ≥ 150	Manufacture / import	(a)(15)
January 1, 2028	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	Sale / distribution	(b)
January 1, 2029	Foam products in the (a)(14) formulations for use in space and military applications	GWP ≥ 150	Sale / distribution	(b)

All 84.54 categories restricting R-365mfc (39)

Refrigeration, air conditioning & heat pumps (32)
January 1, 2025	Self-contained residential & light-commercial AC and heat pump products	GWP ≥ 700	(a)(1)
January 1, 2025	Chillers for comfort cooling	GWP ≥ 700	(a)(10)(i)
January 1, 2025	Chillers for ice rinks	GWP ≥ 700	(a)(10)(ii)
January 1, 2025	Residential dehumidifiers	GWP ≥ 700	(a)(2)
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, 2025	Residential & light-commercial AC and heat pump systems (except VRF)	GWP ≥ 700	(c)(1)
January 1, 2025	Chillers for comfort cooling	GWP ≥ 700	(c)(3)
January 1, 2025	Ice rinks	GWP ≥ 700	(c)(4)
January 1, 2026	Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)	GWP ≥ 700	(a)(10)(iii)
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, 2026	Variable refrigerant flow (VRF) residential & light-commercial AC and heat pump systems	GWP ≥ 700	(c)(2)
January 1, 2026	Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)	GWP ≥ 700	(c)(5)(i)
July 27, 2026	Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higher	GWP ≥ 700	(a)(6)
July 27, 2026	Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higher	GWP ≥ 700	(c)(7)
July 27, 2026	Cold storage warehouse systems	GWP ≥ 700	(c)(9)(i)
January 1, 2027	Self-contained products in data center, information technology equipment facility, and computer room cooling	GWP ≥ 700	(a)(11)
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, 2027	Data center, information technology equipment facility, and computer room cooling systems	GWP ≥ 700	(c)(13)
January 1, 2028	Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(a)(10)(iv)
January 1, 2028	Industrial process refrigeration products (non-chiller), refrigerant entering the evaporator from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(a)(12)(iii)
January 1, 2028	Industrial process refrigeration systems (non-chiller), evaporator inlet from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(c)(10)(iv)
January 1, 2028	Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)	GWP ≥ 700	(c)(6)(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-365mfc 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-365mfc 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

Frequently asked

›What's a foam blowing agent?

A volatile compound used to generate gas bubbles in polymer foam manufacturing. For polyurethane insulation, the blowing agent is mixed with the liquid polyurethane precursors; when the chemical reaction generates heat, the blowing agent vaporizes and creates the cellular foam structure that provides the insulating value. The agent remains trapped in the foam cells, contributing to long-term thermal performance. Foam-blowing agents are different from refrigerants in HVAC application but share volatile properties — many refrigerants (HFCs, HFOs) are also foam-blowing agents.

›Why is R-365mfc's boiling point so high?

Four-carbon molecule with five fluorines. Each carbon-fluorine bond adds molecular weight, and four-carbon chains have more intermolecular interactions than three-carbon or two-carbon chains. The combination produces a normal boiling point of +104°F (40°C). For comparison, three-carbon R-245fa boils at +59°F; two-carbon R-134a boils at −15°F; one-carbon R-32 boils at −61°F. Higher-carbon-count HFCs generally have higher boiling points.

›What does A2 flammability classification mean?

ASHRAE 34's A2 classification indicates flammability with burning velocity greater than the A2L threshold (10 cm/s). A2 refrigerants support more aggressive combustion than A2L refrigerants — flame propagation is faster and combustion is more complete. R-152a (HFC-152a) is the other commonly-discussed A2 HFC. A2 refrigerants face more restrictive equipment design requirements than A2L.

›What is the GWP of R-365mfc?

794. Moderate — lower than R-134a (1,430) but well above modern low-GWP HFO alternatives like R-1233zd(E) (4). The 8.7-year atmospheric lifetime is short for an HFC.

›Why is R-365mfc being replaced in foam blowing?

GWP and regulatory pressure. The EU F-Gas Regulation has targeted foam-blowing applications specifically due to the high emissions intensity (the blowing agent vapors are not contained — they're released during foam manufacturing and gradual diffusion from the foam over decades). R-1233zd(E) provides similar foam-blowing performance with GWP 4 instead of 794 — a 99.5% GWP reduction.

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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 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