CFC-12 depletes the ozone layer: EPA lists it as a class I ozone-depleting substance with an ODP of 1. The US ban on producing and importing it took effect on January 1, 1996.

Production and import ended in 1996, but EPA says vehicles built before 1994 may still use CFC-12 if they have not been retrofitted. CFC-12 in containers of less than 20 pounds may be sold only to technicians certified under Section 609.

RefrigerantASHRAE R-12

R12 PT Chart

Q: What's R-12's GWP and ODP?

ODP 1 and GWP 10,900 (IPCC AR4). Per kilogram released, that is about 5.2 times R-410A's GWP (2,088) and 2.8 times R-404A's (3,922).

Updated October 20, 2026

R-12

A1 Lower toxicity, no flame propagationCFC ODS — CFC US production banned · 1996

Illustration of an R-12 cylinder painted white, the color AHRI Guideline N-2017 lists for R-12^{[6], Table 1}. Label: R-12, safety class A1, GWP 10,900. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[6], section 4.7}.

CCl2F2

R-12 is CFC-12, dichlorodifluoromethane (CCl₂F₂)^[8]^[7]. EPA says its use in new vehicles has been banned since 1994^[9]. ODP 1 and GWP 10,900 (IPCC AR4)^[7]. The US ban on its production and import took effect on January 1, 1996^[10].

R-12 saturation pressure is 36.9 PSIG at 40°F, 70.1 PSIG at 70°F, and 116.9 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.

Checked against the NIST Chemistry WebBook, SRD 69 — Thermophysical Properties of Fluid Systems: Methane, dichlorodifluoro- (R12), saturation properties^[1] at 18 points from −30°F to 140°F: largest difference 0.001 psi.

Saturation @ 70°F

70.1 PSIG

GWP (100-yr)

10,900 IPCC AR4

Boiling point

−21.6°F

Sourced facts

ASHRAE safety class: A1^[3]
Chemical formula: CCl₂F₂^[3]
ODP: 1.0^[7]
GWP (100-yr): 10,900^{[4], Table 2.14}
Normal boiling point: −21.6°F (−29.8°C)^[5]
Critical temperature: 233.5°F (112.0°C)^[5]
US production and import: Ended January 1, 1996^[10]
Lubricant: Mineral oil or alkylbenzene^{[19], R-12 row}

R-12 PT calculator Superheat

R-12 PT chart — printable saturation table

Looking for the R-12 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-12 PT Chart — Pressure-Temperature Saturation Table

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

R-12 · 1° increments · °F / PSIG

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

R-12 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	11.0 in. Hg vac.
−39°F	10.5 in. Hg vac.
−38°F	10.0 in. Hg vac.
−37°F	9.5 in. Hg vac.
−36°F	8.9 in. Hg vac.
−35°F	8.4 in. Hg vac.
−34°F	7.8 in. Hg vac.
−33°F	7.3 in. Hg vac.
−32°F	6.7 in. Hg vac.
−31°F	6.1 in. Hg vac.
−30°F	5.5 in. Hg vac.
−29°F	4.9 in. Hg vac.
−28°F	4.3 in. Hg vac.
−27°F	3.7 in. Hg vac.
−26°F	3.0 in. Hg vac.
−25°F	2.4 in. Hg vac.
−24°F	1.7 in. Hg vac.
−23°F	1.0 in. Hg vac.
−22°F NBP (atmospheric)	0.3 in. Hg vac.
−21°F	0.2
−20°F	0.5
−19°F	0.9
−18°F	1.3
−17°F	1.7
−16°F	2.0
−15°F	2.4
−14°F	2.8
−13°F	3.2
−12°F	3.6
−11°F	4.0
−10°F	4.5
−9°F	4.9
−8°F	5.3
−7°F	5.8
−6°F	6.2
−5°F	6.7
−4°F	7.2
−3°F	7.6
−2°F	8.1
−1°F	8.6
0°F	9.1
1°F	9.6
2°F	10.1
3°F	10.7
4°F	11.2
5°F	11.7
6°F	12.3
7°F	12.9
8°F	13.4
9°F	14.0
10°F	14.6
11°F	15.2
12°F	15.8
13°F	16.4
14°F	17.0
15°F	17.7
16°F	18.3
17°F	19.0
18°F	19.6
19°F	20.3
20°F	21.0
21°F	21.7
22°F	22.4
23°F	23.1
24°F	23.8
25°F	24.6
26°F	25.3
27°F	26.1
28°F	26.8
29°F	27.6
30°F	28.4
31°F	29.2
32°F H₂O freeze	30.0
33°F	30.8
34°F	31.7
35°F	32.5
36°F	33.4
37°F	34.2
38°F	35.1
39°F	36.0
40°F	36.9
41°F	37.8
42°F	38.7
43°F	39.7
44°F	40.6
45°F	41.6
46°F	42.6
47°F	43.6
48°F	44.6
49°F	45.6
50°F	46.6
51°F	47.6
52°F	48.7
53°F	49.8
54°F	50.9
55°F	51.9
56°F	53.1
57°F	54.2
58°F	55.3
59°F	56.5
60°F	57.6
61°F	58.8
62°F	60.0
63°F	61.2
64°F	62.4
65°F	63.7
66°F	64.9
67°F	66.2
68°F	67.5
69°F	68.8
70°F	70.1
71°F	71.4
72°F	72.7
73°F	74.1
74°F	75.5
75°F	76.8
76°F	78.2
77°F	79.7
78°F	81.1
79°F	82.5
80°F	84.0
81°F	85.5
82°F	87.0
83°F	88.5
84°F	90.0
85°F	91.6
86°F	93.2
87°F	94.7
88°F	96.3
89°F	98.0
90°F	99.6
91°F	101.3
92°F	102.9
93°F	104.6
94°F	106.3
95°F	108.0
96°F	109.8
97°F	111.5
98°F	113.3
99°F	115.1
100°F	116.9
101°F	118.8
102°F	120.6
103°F	122.5
104°F	124.4
105°F	126.3
106°F	128.2
107°F	130.2
108°F	132.1
109°F	134.1
110°F	136.1
111°F	138.1
112°F	140.2
113°F	142.2
114°F	144.3
115°F	146.4
116°F	148.6
117°F	150.7
118°F	152.9
119°F	155.1
120°F	157.3
121°F	159.5
122°F	161.8
123°F	164.0
124°F	166.3
125°F	168.6
126°F	171.0
127°F	173.3
128°F	175.7
129°F	178.1
130°F	180.5
131°F	183.0
132°F	185.5
133°F	188.0
134°F	190.5
135°F	193.0
136°F	195.6
137°F	198.2
138°F	200.8
139°F	203.4
140°F	206.0
141°F	208.7
142°F	211.4
143°F	214.1
144°F	216.9
145°F	219.7
146°F	222.5
147°F	225.3
148°F	228.1
149°F	231.0
150°F	233.9

R-12 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	−37
−39°C	−34
−38°C	−31
−37°C	−28
−36°C	−24
−35°C	−21
−34°C	−17
−33°C	−13
−32°C	−9
−31°C	−5
−30°C NBP (atmospheric)	−1
−29°C	3
−28°C	8
−27°C	12
−26°C	17
−25°C	22
−24°C	27
−23°C	33
−22°C	38
−21°C	44
−20°C	49
−19°C	55
−18°C	61
−17°C	68
−16°C	74
−15°C	81
−14°C	88
−13°C	95
−12°C	102
−11°C	110
−10°C	117
−9°C	125
−8°C	134
−7°C	142
−6°C	150
−5°C	159
−4°C	168
−3°C	178
−2°C	187
−1°C	197
0°C H₂O freeze	207
1°C	217
2°C	228
3°C	238
4°C	249
5°C	261
6°C	272
7°C	284
8°C	296
9°C	309
10°C	321
11°C	334
12°C	348
13°C	361
14°C	375
15°C	389
16°C	404
17°C	419
18°C	434
19°C	449
20°C	465
21°C	481
22°C	498
23°C	515
24°C	532
25°C	549
26°C	567
27°C	585
28°C	604
29°C	623
30°C	642
31°C	662
32°C	682
33°C	703
34°C	724
35°C	745
36°C	767
37°C	789
38°C	811
39°C	834
40°C	857
41°C	881
42°C	905
43°C	930
44°C	955
45°C	981
46°C	1,007
47°C	1,033
48°C	1,060
49°C	1,087
50°C	1,115
51°C	1,144
52°C	1,172
53°C	1,202
54°C	1,231
55°C	1,262
56°C	1,292
57°C	1,324
58°C	1,355
59°C	1,388
60°C	1,421
61°C	1,454
62°C	1,488
63°C	1,522
64°C	1,557
65°C	1,593
66°C	1,629

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-12 PT chart data: CoolProp 7.2.0 (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^{[3], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-12

Temp:°F

70.1PSIG(483 kPa)

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

Common service temperatures

32°F

30PSIG

Freezing

45°F

42PSIG

Heat-pump heat

70°F

70PSIG

Standard

75°F

77PSIG

Test ref

80°F

84PSIG

Warm

95°F

108PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[5]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

CCl2F2

Dichlorodifluoromethane

Lubricant compatibility

MOABPOE

Common applications

A/C in vehicles built before 1994 that have not been retrofitted^[9]

Properties

Boiling point (1 atm)
−21.6°F (−29.8°C)
Critical point
233.5°F (112.0°C) at 585 PSIG
Molar mass
120.91 g/mol
ODP
1
GWP (100-yr)
10,900 IPCC AR4 IPCC: AR4 10,900 · AR5 10,200 · AR6 12,500 AR6 final Table 7.SM.7 value (a pre-final draft printed 11200).
Atmospheric lifetime
100 years
New-equipment status (US)
Class I ODS (CFC) — US production/import ended January 1, 1996.

What is R-12?

R-12 is pure dichlorodifluoromethane (CCl₂F₂), the chlorofluorocarbon CFC-12^[8]^[7].

Its ozone depletion potential is 1, the same as the reference substance, CFC-11^[7]. The US ban on producing and importing CFC-12 took effect on January 1, 1996^[10].

Where R-12 is used

Vehicle A/C systems built before 1994 that have not been retrofitted^[9]

Service notes

Under Section 608, stationary R-12 equipment is a medium-pressure appliance^[11]; technicians servicing it need Type II or Universal certification, or Type I for small appliances^[12]. Technicians who service vehicle A/C for consideration must be certified under Section 609^[13].

Operating cycle

Phase-down timeline

R-12 (CFC-12) is a class I ozone-depleting substance under the Clean Air Act^[7].

January 1, 1996 — US ban on production and import took effect^[10].

Servicing. Stationary R-12 equipment is a medium-pressure appliance under 40 CFR 82.152^[11]; technicians need Section 608 Type II or Universal certification, or Type I for small appliances^[12]. Technicians who service vehicle A/C for consideration (payment or barter) must be certified under Section 609, and CFC-12 in containers of less than 20 pounds may be sold only to Section 609-certified technicians^[13]. Venting the refrigerant is prohibited^[2].

Global warming potential, in context

Mobile air conditioning

Retrofit and replacement paths

Replacements for R-12

Reading the R-12 PT chart

R-12's PT chart is a single saturation curve (pure CFC, no glide). EPA lists HFC-134a among the refrigerants that can be used to retrofit CFC-12 vehicle A/C^[9].

R-12 vs R-134a, R-152a, R-1234yf: saturation pressure

Saturation pressure (PSIG, gauge) for R-12 vs R-134a, R-152a, R-1234yf. Each column shows the percent difference from R-12. Source: CoolProp 7.2.0 dataset.
Temp	R-12	R-134a	R-152a	R-1234yf
0°F	9.1	6.5	4.5	9.2
40°F	36.9	35.0(−5%)	30.1(−18%)	38.4(+4%)
70°F	70.1	71.1(+1%)	62.3(−11%)	73.9(+6%)
100°F	116.9	124.2(+6%)	109.5(−6%)	124.9(+7%)

Frequently asked

›Why was R-12 banned?

CFC-12 depletes the ozone layer: EPA lists it as a class I ozone-depleting substance with an ODP of 1^[7].

The US ban on producing and importing it took effect on January 1, 1996^[10].

›Is R-12 still legal?

Production and import ended in 1996^[10], but EPA says vehicles built before 1994 may still use CFC-12 if they have not been retrofitted^[9]. CFC-12 in containers of less than 20 pounds may be sold only to technicians certified under Section 609^[13].

›What's R-12's GWP and ODP?

ODP 1 and GWP 10,900 (IPCC AR4)^[7].

Per kilogram released, that is about 5.2 times R-410A's GWP (2,088) and 2.8 times R-404A's (3,922)^[14].

›What replaced R-12 in cars?

EPA lists HFC-134a among the refrigerants that can be used to retrofit CFC-12 vehicle A/C^[9].

R-134a is now restricted in new vehicles too: the EU MAC Directive bars refrigerants with a GWP above 150 in new vehicle types from January 1, 2011 and in all new cars and light vans (categories M1 and N1 class I) from January 1, 2017^[15], and 40 CFR 84.54(a)(13) bars a GWP of 150 or more in new US light-duty vehicles from Model Year 2025^{[16], §84.54(a)(13)}.

›Is R-12 the same as Freon?

Freon™ is a Chemours trademark used on several refrigerants, such as Freon™ 134a and Freon™ 410A^[17]^[18]; R-12 is the ASHRAE number for dichlorodifluoromethane^[8].

Download this dataset

Full PT chart for R-12 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
NIST Chemistry WebBook (SRD 69) saturation data for R-12. NIST. https://webbook.nist.gov/cgi/fluid.cgi?TLow=-40&THigh=150&TInc=10&Digits=6&ID=C75718&Action=Load&Type=SatT&TUnit=F&PUnit=psia&DUnit=lbm%2Fft3&HUnit=Btu%2Flbm&WUnit=ft%2Fs&VisUnit=uPa*s&STUnit=lb%2Fin&RefState=DEF (accessed October 5, 2026)
[2]
Stationary Refrigeration — Prohibition on Venting Refrigerants. US EPA. last updated December 8, 2025. https://www.epa.gov/section608/stationary-refrigeration-prohibition-venting-refrigerants (accessed October 2, 2026)
[3]
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)
[4]
IPCC AR4 WG1 (2007), Chapter 2, Table 2.14, 100-year Global Warming Potentials. IPCC AR4 Working Group I. 2007. https://www.ipcc.ch/site/assets/uploads/2018/02/ar4-wg1-chapter2-1.pdf (accessed October 2, 2026)
[5]
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
[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]
Ozone-Depleting Substances. US EPA. last updated April 9, 2026. https://www.epa.gov/ozone-layer-protection/ozone-depleting-substances (accessed October 2, 2026)
[8]
ASHRAE Refrigerant Designations. ASHRAE. web page, updated May 25, 2021. https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations (accessed October 2, 2026)
[9]
Choosing and Using a Retrofit Refrigerant for a CFC-12 MVAC. US EPA. last updated January 20, 2026. https://www.epa.gov/mvac/choosing-and-using-retrofit-refrigerant-cfc-12-motor-vehicle-air-conditioner-mvac (accessed October 5, 2026)
[10]
Phaseout of Class I Ozone-Depleting Substances. US EPA. last updated March 10, 2026. https://www.epa.gov/ods-phaseout/phaseout-class-i-ozone-depleting-substances (accessed October 5, 2026)
[11]
40 CFR 82.152 — Definitions (Section 608). eCFR (Office of the Federal Register). current. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.152 (accessed October 2, 2026)
[12]
40 CFR 82.161 — Technician certification. eCFR (Office of the Federal Register). up to date as of 10/1/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.161 (accessed October 5, 2026)
[13]
Regulatory Requirements for MVAC System Servicing. US EPA. last updated April 8, 2026. https://www.epa.gov/mvac/regulatory-requirements-mvac-system-servicing (accessed October 5, 2026)
[14]
Technology Transitions GWP Reference Table. US EPA. updated April 2, 2026. https://www.epa.gov/hfcs/technology-transitions-gwp-reference-table (accessed October 2, 2026)
[15]
Directive 2006/40/EC (MAC Directive). EUR-Lex. OJ L 161, 14.6.2006. https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32006L0040 (accessed October 2, 2026)
[16]
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)
[17]
Freon™ 134a Refrigerant (R-134a) Properties, Uses, Storage, and Handling. Chemours. C-11062 (7/26). https://www.freon.com/en/-/media/files/freon/freon-134a-push-bulletin.pdf (accessed October 2, 2026)
[18]
Freon™ 410A Refrigerant (R-410A) Product Information. Chemours. C-10906 (10/16). https://www.freon.com/en/-/media/files/freon/freon-410a-product-information.pdf (accessed October 2, 2026)
[19]
Refrigerants and lubricants approved for use in Copeland compressors. Copeland. Form 93-11 R41 (5/24). https://webapps.copeland.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=93-11 (accessed October 2, 2026)