RefrigerantASHRAE R-11

R11 PT Chart

Q: Why does R-11 operate in vacuum?

Its normal boiling point is 74.7°F (23.7°C), so below that temperature its saturation pressure is below atmospheric: 15.6 in. Hg vacuum at 40°F and 2.7 in. Hg vacuum at 70°F.

Updated October 12, 2026

R-11

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

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^{[4], section 4.8}. Label: R-11, safety class A1, GWP 4,750. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[4], section 4.7}.

CCl3F

R-11 is CFC-11, trichlorofluoromethane (CCl₃F)^[10]^[7]. Safety class A1: lower toxicity, no flame propagation^[6]. GWP 4,750 (IPCC AR4)^{[8], Table 2.14}. ODP 1.0 — the reference value: EPA defines the ODP of CFC-11 as 1.0^[7]. The US ban on its production and import took effect on January 1, 1996^[9]. Equipment that uses R-11 is a low-pressure appliance under 40 CFR 82.152^[11].

R-11 saturation pressure is 15.6 in. Hg vacuum at 40°F, 2.7 in. Hg vacuum at 70°F, and 8.9 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, trichlorofluoro- (R11), saturation properties^[1] at 18 points from −29°F to 149°F: largest difference 0.001 psi.

Saturation @ 70°F

2.7 in. Hg vac.

GWP (100-yr)

4,750 IPCC AR4

Boiling point

74.7°F

Sourced facts

ASHRAE safety class: A1^[6]
Chemical formula: CCl₃F^[6]
ODP: 1.0^[7]
GWP (100-yr): 4,750^{[8], Table 2.14}
Normal boiling point: 74.7°F (23.7°C)^[5]
Critical temperature: 388.3°F (198.0°C)^[5]
US production and import: Ended January 1, 1996^[9]

R-11 PT calculator Superheat

R-11 PT chart — printable saturation table

Looking for the R-11 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-11 PT Chart — Pressure-Temperature Saturation Table

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

R-11 · 1° increments · °F / PSIG

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

R-11 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	28.4 in. Hg vac.
−39°F	28.4 in. Hg vac.
−38°F	28.3 in. Hg vac.
−37°F	28.3 in. Hg vac.
−36°F	28.2 in. Hg vac.
−35°F	28.1 in. Hg vac.
−34°F	28.1 in. Hg vac.
−33°F	28.0 in. Hg vac.
−32°F	28.0 in. Hg vac.
−31°F	27.9 in. Hg vac.
−30°F	27.8 in. Hg vac.
−29°F	27.7 in. Hg vac.
−28°F	27.7 in. Hg vac.
−27°F	27.6 in. Hg vac.
−26°F	27.5 in. Hg vac.
−25°F	27.5 in. Hg vac.
−24°F	27.4 in. Hg vac.
−23°F	27.3 in. Hg vac.
−22°F	27.2 in. Hg vac.
−21°F	27.1 in. Hg vac.
−20°F	27.0 in. Hg vac.
−19°F	26.9 in. Hg vac.
−18°F	26.8 in. Hg vac.
−17°F	26.8 in. Hg vac.
−16°F	26.7 in. Hg vac.
−15°F	26.6 in. Hg vac.
−14°F	26.5 in. Hg vac.
−13°F	26.3 in. Hg vac.
−12°F	26.2 in. Hg vac.
−11°F	26.1 in. Hg vac.
−10°F	26.0 in. Hg vac.
−9°F	25.9 in. Hg vac.
−8°F	25.8 in. Hg vac.
−7°F	25.7 in. Hg vac.
−6°F	25.5 in. Hg vac.
−5°F	25.4 in. Hg vac.
−4°F	25.3 in. Hg vac.
−3°F	25.1 in. Hg vac.
−2°F	25.0 in. Hg vac.
−1°F	24.9 in. Hg vac.
0°F	24.7 in. Hg vac.
1°F	24.6 in. Hg vac.
2°F	24.4 in. Hg vac.
3°F	24.3 in. Hg vac.
4°F	24.1 in. Hg vac.
5°F	24.0 in. Hg vac.
6°F	23.8 in. Hg vac.
7°F	23.6 in. Hg vac.
8°F	23.5 in. Hg vac.
9°F	23.3 in. Hg vac.
10°F	23.1 in. Hg vac.
11°F	22.9 in. Hg vac.
12°F	22.7 in. Hg vac.
13°F	22.5 in. Hg vac.
14°F	22.3 in. Hg vac.
15°F	22.1 in. Hg vac.
16°F	21.9 in. Hg vac.
17°F	21.7 in. Hg vac.
18°F	21.5 in. Hg vac.
19°F	21.3 in. Hg vac.
20°F	21.1 in. Hg vac.
21°F	20.9 in. Hg vac.
22°F	20.6 in. Hg vac.
23°F	20.4 in. Hg vac.
24°F	20.1 in. Hg vac.
25°F	19.9 in. Hg vac.
26°F	19.7 in. Hg vac.
27°F	19.4 in. Hg vac.
28°F	19.1 in. Hg vac.
29°F	18.9 in. Hg vac.
30°F	18.6 in. Hg vac.
31°F	18.3 in. Hg vac.
32°F H₂O freeze	18.1 in. Hg vac.
33°F	17.8 in. Hg vac.
34°F	17.5 in. Hg vac.
35°F	17.2 in. Hg vac.
36°F	16.9 in. Hg vac.
37°F	16.6 in. Hg vac.
38°F	16.3 in. Hg vac.
39°F	15.9 in. Hg vac.
40°F	15.6 in. Hg vac.
41°F	15.3 in. Hg vac.
42°F	14.9 in. Hg vac.
43°F	14.6 in. Hg vac.
44°F	14.2 in. Hg vac.
45°F	13.9 in. Hg vac.
46°F	13.5 in. Hg vac.
47°F	13.2 in. Hg vac.
48°F	12.8 in. Hg vac.
49°F	12.4 in. Hg vac.
50°F	12.0 in. Hg vac.
51°F	11.6 in. Hg vac.
52°F	11.2 in. Hg vac.
53°F	10.8 in. Hg vac.
54°F	10.4 in. Hg vac.
55°F	10.0 in. Hg vac.
56°F	9.5 in. Hg vac.
57°F	9.1 in. Hg vac.
58°F	8.6 in. Hg vac.
59°F	8.2 in. Hg vac.
60°F	7.7 in. Hg vac.
61°F	7.2 in. Hg vac.
62°F	6.8 in. Hg vac.
63°F	6.3 in. Hg vac.
64°F	5.8 in. Hg vac.
65°F	5.3 in. Hg vac.
66°F	4.8 in. Hg vac.
67°F	4.3 in. Hg vac.
68°F	3.7 in. Hg vac.
69°F	3.2 in. Hg vac.
70°F	2.7 in. Hg vac.
71°F	2.1 in. Hg vac.
72°F	1.5 in. Hg vac.
73°F	1.0 in. Hg vac.
74°F	0.4 in. Hg vac.
75°F NBP (atmospheric)	0.1
76°F	0.4
77°F	0.7
78°F	1.0
79°F	1.3
80°F	1.6
81°F	1.9
82°F	2.2
83°F	2.6
84°F	2.9
85°F	3.2
86°F	3.6
87°F	3.9
88°F	4.3
89°F	4.6
90°F	5.0
91°F	5.4
92°F	5.7
93°F	6.1
94°F	6.5
95°F	6.9
96°F	7.3
97°F	7.7
98°F	8.1
99°F	8.5
100°F	8.9
101°F	9.3
102°F	9.7
103°F	10.2
104°F	10.6
105°F	11.0
106°F	11.5
107°F	12.0
108°F	12.4
109°F	12.9
110°F	13.4
111°F	13.8
112°F	14.3
113°F	14.8
114°F	15.3
115°F	15.8
116°F	16.3
117°F	16.9
118°F	17.4
119°F	17.9
120°F	18.5
121°F	19.0
122°F	19.6
123°F	20.1
124°F	20.7
125°F	21.3
126°F	21.8
127°F	22.4
128°F	23.0
129°F	23.6
130°F	24.2
131°F	24.8
132°F	25.5
133°F	26.1
134°F	26.7
135°F	27.4
136°F	28.0
137°F	28.7
138°F	29.4
139°F	30.1
140°F	30.7
141°F	31.4
142°F	32.1
143°F	32.8
144°F	33.6
145°F	34.3
146°F	35.0
147°F	35.8
148°F	36.5
149°F	37.3
150°F	38.0

R-11 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	−96
−39°C	−96
−38°C	−96
−37°C	−95
−36°C	−95
−35°C	−94
−34°C	−94
−33°C	−94
−32°C	−93
−31°C	−93
−30°C	−92
−29°C	−92
−28°C	−91
−27°C	−90
−26°C	−90
−25°C	−89
−24°C	−89
−23°C	−88
−22°C	−87
−21°C	−86
−20°C	−86
−19°C	−85
−18°C	−84
−17°C	−83
−16°C	−82
−15°C	−81
−14°C	−80
−13°C	−79
−12°C	−78
−11°C	−77
−10°C	−76
−9°C	−74
−8°C	−73
−7°C	−72
−6°C	−70
−5°C	−69
−4°C	−68
−3°C	−66
−2°C	−64
−1°C	−63
0°C H₂O freeze	−61
1°C	−59
2°C	−58
3°C	−56
4°C	−54
5°C	−52
6°C	−50
7°C	−48
8°C	−45
9°C	−43
10°C	−41
11°C	−38
12°C	−36
13°C	−33
14°C	−30
15°C	−28
16°C	−25
17°C	−22
18°C	−19
19°C	−16
20°C	−13
21°C	−9
22°C	−6
23°C	−3
24°C NBP (atmospheric)	1
25°C	5
26°C	8
27°C	12
28°C	16
29°C	20
30°C	25
31°C	29
32°C	33
33°C	38
34°C	43
35°C	47
36°C	52
37°C	57
38°C	62
39°C	68
40°C	73
41°C	79
42°C	84
43°C	90
44°C	96
45°C	102
46°C	108
47°C	115
48°C	121
49°C	128
50°C	135
51°C	142
52°C	149
53°C	156
54°C	164
55°C	171
56°C	179
57°C	187
58°C	195
59°C	203
60°C	212
61°C	221
62°C	229
63°C	238
64°C	248
65°C	257
66°C	267

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-11 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^{[6], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-11

Temp:°F

−1.3PSIG(−9 kPa)

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

Common service temperatures

32°F

−9PSIG

Freezing

45°F

−7PSIG

Heat-pump heat

70°F

−1PSIG

Standard

75°F

0PSIG

Test ref

80°F

2PSIG

Warm

95°F

7PSIG

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

CCl3F

Trichlorofluoromethane

Lubricant compatibility

MOABPOE

Common applications

Low-pressure appliances (40 CFR 82.152)^[11]
Reference for ozone depletion potential: ODP of CFC-11 = 1.0^[7]

Properties

Boiling point (1 atm)
74.7°F (23.7°C)
Critical point
388.3°F (198.0°C) at 623 PSIG
Molar mass
137.37 g/mol
ODP
1
GWP (100-yr)
4,750 IPCC AR4 IPCC: AR4 4,750 · AR5 4,660 · AR6 6,230 AR6 final Table 7.SM.7 value (a pre-final draft printed 5560).
Atmospheric lifetime
45 years
New-equipment status (US)
Class I ODS (CFC) — US production/import ended January 1, 1996.

What is R-11?

R-11 is pure trichlorofluoromethane (CCl₃F), the chlorofluorocarbon CFC-11^[10]^[7]. Its ozone depletion potential is the reference for the scale: the ODP of CFC-11 is defined as 1.0, and other CFCs and HCFCs range from 0.01 to 1.0^[7].

The US ban on producing and importing CFC-11 took effect on January 1, 1996^[9].

Service notes

Its normal boiling point is 74.7°F (23.7°C)^[5], so its saturation pressure is below atmospheric at any lower temperature — 15.6 in. Hg vacuum at 40°F.

Operating cycle

Phase-down timeline

R-11 (CFC-11) is a class I ozone-depleting substance under the Clean Air Act^[7].

January 1, 1996 — US ban on production and import took effect^[9].

Servicing. Equipment using R-11 is a low-pressure appliance under 40 CFR 82.152^[11]; technicians servicing it need Section 608 Type III or Universal certification^[2], and venting the refrigerant is prohibited^[3].

Global warming potential, in context

Low-pressure centrifugal chillers

Retrofit and replacement paths

Replacements for R-11

R-11 vs R-123, R-1233zd(E), R-514A: saturation pressure

Saturation pressure (PSIG, gauge) for R-11 vs R-123, R-1233zd(E), R-514A. Sources: R-11, R-123 and R-1233zd(E): CoolProp 7.2.0 dataset; R-514A: Chemours chart C-10867.
Temp	R-11	R-123	R-1233zd(E)	R-514A
0°F	24.7 in. Hg vac.	25.9 in. Hg vac.	23.8 in. Hg vac.	—
40°F	15.6 in. Hg vac.	18.2 in. Hg vac.	12.7 in. Hg vac.	18.8 in. Hg vac.
70°F	2.7 in. Hg vac.	6.6 in. Hg vac.	1.6	7.7 in. Hg vac.
100°F	8.9	6.1	14.4	5.3

Frequently asked

›Why is R-11 the reference for ozone-depletion potential?

EPA defines the ODP of CFC-11 as 1.0; other CFCs and HCFCs range from 0.01 to 1.0^[7]. EPA lists CFC-12 at 1 and HCFC-22 at 0.055^[7].

›Why does R-11 operate in vacuum?

Its normal boiling point is 74.7°F (23.7°C)^[5], so below that temperature its saturation pressure is below atmospheric: 15.6 in. Hg vacuum at 40°F and 2.7 in. Hg vacuum at 70°F.

Download this dataset

Full PT chart for R-11 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
NIST Chemistry WebBook (SRD 69) saturation data for R-11. NIST. https://webbook.nist.gov/cgi/fluid.cgi?TLow=-40&THigh=150&TInc=10&Digits=6&ID=C75694&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]
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)
[3]
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)
[4]
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)
[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]
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)
[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]
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)
[9]
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)
[10]
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)
[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)