HVAC PT ChartsVerified saturation data · 61 refrigerants
RefrigerantASHRAE R-152a

R-152a

A2FlammableHFC (pure)
CH3CHF2

Pure HFC (1,1-difluoroethane, CHF₂CH₃) — A2 flammable, GWP 124 (low for HFC). Primarily used as aerosol propellant and foam blowing agent rather than refrigerant. Limited refrigeration use due to A2 flammability classification.

Saturation @ 70°F
62.3PSIG
GWP (IPCC AR5)
124100-yr
Temperature glide
≈0°F
Boiling point
-11.2°F
Sourced facts
ASHRAE safety class
A2[src]
Chemical formula
CHF₂CH₃[src]
GWP (100-yr)
124IPCC AR5[src]
ODP
0[src]
Normal boiling point
−11.2°F (−24.0°C)[src]
Primary applications
Aerosol / foam[src]
R-152a PT calculator Superheat
A2
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.

01

Saturation pressure-temperature curve

Pressure
Temperature
°F
70°F: 62.3 PSIG
Quick lookup — R-152a
62.3PSIG(429 kPa)
Range: -40 to 150°FOpen full PT calculator →
Common service temperatures
32°F
24PSIG
Freezing
45°F
35PSIG
Heat-pump heat
70°F
62PSIG
Standard
75°F
69PSIG
Test ref
80°F
76PSIG
Warm
95°F
100PSIG
Summer peak

Saturation values from CoolProp 7.2.0 R152a. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

02

R-152a PT chart PDF — printable saturation table

Looking for the R-152a 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-152a PT Chart — Pressure-Temperature Saturation Table

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

R-152a · 1° increments · °F / PSIG
Tinted rows: NBP atmospheric crossover · 32°F H₂O freeze
R-152a pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Pressure (PSIG)
-40°F-7.8
-39°F-7.7
-38°F-7.5
-37°F-7.2
-36°F-7.0
-35°F-6.8
-34°F-6.6
-33°F-6.4
-32°F-6.1
-31°F-5.9
-30°F-5.7
-29°F-5.4
-28°F-5.1
-27°F-4.9
-26°F-4.6
-25°F-4.3
-24°F-4.1
-23°F-3.8
-22°F-3.5
-21°F-3.2
-20°F-2.9
-19°F-2.6
-18°F-2.3
-17°F-2.0
-16°F-1.6
-15°F-1.3
-14°F-1.0
-13°F-0.6
-12°F-0.3
-11°FNBP (atmospheric)0.1
-10°F0.5
-9°F0.8
-8°F1.2
-7°F1.6
-6°F2.0
-5°F2.4
-4°F2.8
-3°F3.2
-2°F3.6
-1°F4.1
0°F4.5
1°F5.0
2°F5.4
3°F5.9
4°F6.4
5°F6.9
6°F7.4
7°F7.9
8°F8.4
9°F8.9
10°F9.4
11°F10.0
12°F10.5
13°F11.1
14°F11.6
15°F12.2
16°F12.8
17°F13.4
18°F14.0
19°F14.6
20°F15.2
21°F15.9
22°F16.5
23°F17.2
24°F17.9
25°F18.5
26°F19.2
27°F19.9
28°F20.6
29°F21.4
30°F22.1
31°F22.8
32°FH₂O freeze23.6
33°F24.4
34°F25.1
35°F25.9
36°F26.7
37°F27.6
38°F28.4
39°F29.2
40°F30.1
41°F31.0
42°F31.8
43°F32.7
44°F33.6
45°F34.6
46°F35.5
47°F36.4
48°F37.4
49°F38.4
50°F39.4
51°F40.4
52°F41.4
53°F42.4
54°F43.5
55°F44.5
56°F45.6
57°F46.7
58°F47.8
59°F48.9
60°F50.0
61°F51.2
62°F52.4
63°F53.5
64°F54.8
65°F56.0
66°F57.2
67°F58.4
68°F59.7
69°F61.0
70°F62.3
71°F63.6
72°F64.9
73°F66.3
74°F67.6
75°F69.0
76°F70.4
77°F71.8
78°F73.2
79°F74.7
80°F76.2
81°F77.6
82°F79.2
83°F80.7
84°F82.2
85°F83.8
86°F85.3
87°F87.0
88°F88.6
89°F90.2
90°F91.9
91°F93.5
92°F95.2
93°F97.0
94°F98.7
95°F100.4
96°F102.2
97°F104.0
98°F105.8
99°F107.7
100°F109.5
101°F111.4
102°F113.3
103°F115.2
104°F117.2
105°F119.2
106°F121.1
107°F123.2
108°F125.2
109°F127.2
110°F129.3
111°F131.4
112°F133.5
113°F135.7
114°F137.9
115°F140.1
116°F142.3
117°F144.5
118°F146.8
119°F149.1
120°F151.4
121°F153.7
122°F156.1
123°F158.4
124°F160.9
125°F163.3
126°F165.8
127°F168.3
128°F170.8
129°F173.3
130°F175.9
131°F178.4
132°F181.1
133°F183.7
134°F186.4
135°F189.1
136°F191.8
137°F194.6
138°F197.3
139°F200.1
140°F203.0
141°F205.8
142°F208.7
143°F211.6
144°F214.6
145°F217.6
146°F220.6
147°F223.6
148°F226.7
149°F229.7
150°F232.9
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-152a 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

CH3CHF2
1,1-Difluoroethane

Lubricant compatibility

POEMO

Class A2 (flammable, low burning velocity). Used as an aerosol propellant and as a blend component to lower GWP. Some mobile AC research interest as a low-GWP option.

Trade names

  • Genetron 152aHoneywell

Common applications

  • Aerosol propellant (consumer products)
  • Blend component (R-500 historical, R-516A)
  • Foam blowing agent
04

Properties

  • Boiling point (1 atm)
    -24.0°C / -11.2°F
  • Critical point
    235.9°F at 641 PSIG
  • Molar mass
    66.05 g/mol
  • Temperature glide
    Negligible (0.00°F)
  • ODP
    0
  • GWP (AR5, 100-yr)
    124
  • GWP (AR6, 100-yr)
    164
  • Atmospheric lifetime
    1.5 years
05

What is R-152a?

R-152a is 1,1-difluoroethane (CHF₂CH₃) — a pure HFC with A2 safety classification and relatively low GWP (124) for an HFC [ashrae34][ipccar5]. R-152a's A2 flammability classification (more flammable than A2L, less than A3 hydrocarbons) limits its commercial use as a refrigerant.

R-152a's dominant commercial role is as an aerosol propellant (the "canned air" used for dusting electronics, the propellant in many compressed-air products) and as a foam blowing agent for polyurethane and other foam manufacturing. Refrigeration use is limited — historically R-152a was a component in R-500 (CFC era blend) and is occasionally specified for special low-GWP applications.

Where R-152a is used

  • Aerosol propellant (compressed-air dusters, specialty propellant applications)
  • Foam blowing agent for polyurethane and polystyrene foams
  • Historical component in R-500 (CFC era R-12 / R-152a azeotrope; banned 1996)
  • Some R-22 retrofit blends in specialty applications
  • Limited use in mobile AC research and prototype applications

Regulatory & phase-down status

R-152a faces minimal phase-down pressure — GWP 124 is below most regulatory thresholds [snap]. The constraints on R-152a use are safety-related (A2 flammability) rather than environmental.

R-152a is not on EPA AIM Act priority targeting lists for restriction. EU F-Gas Regulation does not specifically restrict R-152a as a refrigerant. The market position is stable but limited by the flammability classification.

Service notes

R-152a is rarely encountered as a standalone refrigerant in commercial HVAC service. When encountered, A2 flammability procedures apply — A2 is more flammable than A2L, requiring stricter ignition-source controls during service.

POE or mineral oil compatible depending on application [ahri700].

07

Operating cycle

CompressorRaises pressureCondenserRejects heat to outdoorsExpansion deviceDrops pressureEvaporatorAbsorbs heat from indoorsDischarge: 129 PSIG, 180°FLiquid: 129 PSIG, 100°FEvap inlet: 30 PSIG, 40°F (two-phase)Suction: 30 PSIG, 50°FTypical residential cooling cycle for R-152a (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)
08

Phase-down timeline

R-152a is not currently regulated by AIM Act or EU F-Gas phase-down. Its very low GWP (124) places it below regulatory thresholds. No published phase-down milestones exist for this refrigerant — it is a forward-compatible option for the current low-GWP transition rather than a refrigerant being phased out.

Properties: GWP (AR5) 124 · ODP 0 · Not AIM Act-affected · type: hfc-pure
09

Global warming potential, in context

No peer-comparison group is defined for R-152a. Its 100-year GWP per IPCC AR5 is 124 — below both the EU F-Gas 150 GWP cap and the EPA AIM Act 700 GWP cap.

Peer-comparison groups are defined for refrigerants that compete in the same application sector (residential AC, commercial MT/LT, chillers, mobile AC). Specialty or research-grade refrigerants without a clear peer set don't appear in any group; their GWP is shown above in absolute terms instead.

Reading the R-152a PT chart

R-152a's PT chart is a single saturation curve (pure refrigerant). At 70°F R-152a saturation is approximately 65 PSIG (CoolProp 7.2.0). The pressure envelope is moderate — comparable to R-134a — but commercial refrigeration use is limited by A2 flammability.

HFC chemistry — 2-carbon backbone with 2 fluorines

R-152a is 1,1-difluoroethane: CHF₂CH₃ — two carbons, two fluorines on one carbon, three hydrogens on the other (plus one hydrogen on the carbon bearing the fluorines). The asymmetric structure with substantial hydrogen content gives R-152a its A2 flammability — the hydrogen-rich methyl group provides combustible chemistry.

The short atmospheric lifetime (~1.4 years) is what gives R-152a its low GWP (124) — much lower than fully-fluorinated HFCs like R-125 (GWP 3500) or R-143a (GWP 4470) that persist in the atmosphere for decades.

GWP 124 — low for HFC, but A2 flammability constrains refrigeration use

R-152a's GWP of 124 is low for an HFC — below the EU F-Gas 150-GWP threshold for several commercial refrigeration categories. The low GWP would be favorable for refrigerant use if not for the A2 flammability classification.

The combination of A2 flammability and low GWP makes R-152a an interesting candidate for refrigerant applications where the safety class can be managed. In practice, A2L alternatives (R-32, R-454B with GWP 466) typically win commercial refrigerant adoption over A2 R-152a because A2L equipment design is more widely available than A2 equipment.

A2 flammability is more constraining than A2L

R-152a's A2 classification places it between A2L (mildly flammable, low burning velocity) and A3 (highly flammable hydrocarbons). A2 refrigerants have:

  • Higher burning velocity than A2L (typically 10-100 cm/s vs A2L's ≤10 cm/s)
  • Lower minimum ignition energy than A2L
  • Stricter equipment-design requirements than A2L (more stringent ignition-source isolation, charge limits)
  • More limited EPA SNAP approval scope than A2L

The A2 classification is the primary reason R-152a hasn't captured commercial refrigeration market share comparable to its low GWP positioning would suggest. Most refrigerant markets choose A2L (manageable flammability) or A1 (no flammability) over A2 (more flammable than A2L) when alternatives exist.

How to think about R-152a in 2026 and beyond

R-152a's market role is concentrated in non-refrigerant applications: aerosol propellants and foam blowing. The commercial refrigeration market hasn't adopted R-152a meaningfully due to the A2 flammability classification.

For service technicians, R-152a is essentially invisible in commercial HVAC service — almost never encountered in field work. Aerosol and foam blowing applications use R-152a in non-HVAC contexts (chemical manufacturing, electronics cleaning, foam manufacturing).

The low GWP (124) makes R-152a interesting from a climate perspective — it's one of the lower-GWP HFCs available. But the A2 flammability has prevented mainstream commercial refrigeration adoption, and the A2L alternatives (R-32, R-454B at GWP 466-675) capture the low-GWP refrigerant market R-152a's GWP positioning might otherwise serve.

11

Frequently asked

›What is R-152a used for?

Primarily aerosol propellant (compressed-air dusters, "canned air" for electronics cleaning) and foam blowing agent for polyurethane manufacturing. Refrigeration use is limited — R-152a's A2 flammability classification restricts mainstream refrigerant adoption.

Historically R-152a was a component in R-500 (R-12/R-152a azeotrope, banned 1996 with R-12 under Montreal Protocol). Modern refrigeration use is niche.

›What's R-152a's GWP?

124 per IPCC AR5 — low for an HFC [ipccar5]. The short atmospheric lifetime (~1.4 years) drives the relatively low GWP. R-152a's low GWP is favorable, but the A2 flammability classification limits commercial refrigeration adoption.

›Is R-152a flammable?

Yes — ASHRAE class A2 (flammable, more so than A2L) [ashrae34]. A2 refrigerants have higher burning velocity than A2L and require stricter equipment-design accommodations. Most commercial refrigerant applications choose A2L (R-32) or A1 (R-410A) over A2 (R-152a) to avoid the more stringent A2 safety requirements.

›Why isn't R-152a used more in refrigeration?

A2 flammability classification. A2 refrigerants face stricter equipment-design requirements than A2L (R-32, R-454B, etc.) and are not approved for most US commercial refrigeration end-uses without specific equipment certification.

The trade-off is unfavorable for refrigeration: R-152a's low GWP (124) doesn't compensate for the A2 flammability complexity in most applications when A2L alternatives (R-32, R-454B) offer comparable GWP positioning with manageable A2L flammability.

›What's R-152a used for in cans of compressed air?

R-152a is the working substance in many "canned air" or "compressed air duster" products used for cleaning electronics. The product is mostly liquid R-152a; spraying releases vapor that propels dust away from the cleaned surfaces. The aerosol use accounts for the largest commercial R-152a market.

›What lubricant does R-152a use?

Application-dependent. Foam blowing and aerosol applications don't use lubricant (R-152a is the active substance, not a refrigerant in a closed compressor system). For the limited refrigeration applications, POE or mineral oil compatibility depends on the specific equipment design [ahri700].

Download this dataset

Full PT chart for R-152a · 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]
    CoolProp 7.2.0
    2014 (continually updated)http://www.coolprop.org/doi:10.1021/ie4033999
  4. [4]
    EPA SNAP — R-152a acceptable for limited refrigeration end-uses
    https://www.epa.gov/snap
  5. [5]
    AHRI Standard 700-2019
    2019https://www.ahrinet.org/search-standards
  6. [6]
    NIST Chemistry WebBook — 1,1-Difluoroethane (CAS 75-37-6)
    https://webbook.nist.gov/chemistry/fluid/

Data sources & provenance

PT chart
CoolProp 7.2.0 R152a
Cross-checked against
CoolProp 7.2.0 (R152a); ASHRAE Handbook of Refrigeration 2022
Properties
CoolProp 7.2.0 + ASHRAE Standard 34-2022
GWP
IPCC AR5 Table 8.A.1
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.