This article needs to be updated.(May 2019)
|Preferred IUPAC name
3D model (JSmol)
CompTox Dashboard (EPA)
|Melting point||-110.48 °C (-166.86 °F; 162.67 K)|
|Boiling point||23.77 °C (74.79 °F; 296.92 K)|
|1.1 g/L (at 20 °C)|
|Vapor pressure||89 kPa at 20 °C|
131 kPa at 30 °C
|Safety data sheet||See: data page|
|Lethal dose or concentration (LD, LC):|
LCLo (lowest published)
|26,200 ppm (rat, 4 hr)|
100,000 ppm (rat, 20 min)
100,000 ppm (rat, 2 hr)
|NIOSH (US health exposure limits):|
|TWA 1000 ppm (5600 mg/m3)|
|C 1000 ppm (5600 mg/m3)|
IDLH (Immediate danger)
|Supplementary data page|
|Refractive index (n),|
Dielectric constant (?r), etc.
|UV, IR, NMR, MS|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Trichlorofluoromethane, also called freon-11, CFC-11, or R-11, is a chlorofluorocarbon (CFC). It is a colorless, faintly ethereal, and sweetish-smelling liquid that boils around room temperature. CFC-11 is a Class 1 ozone-depleting substance which damages Earth's protective stratospheric ozone layer.
Trichlorofluoromethane was first widely used as a refrigerant. Because of its high boiling point (compared to most refrigerants), it can be used in systems with a low operating pressure, making the mechanical design of such systems less demanding than that of higher-pressure refrigerants R-12 or R-22.
Trichlorofluoromethane is used as a reference compound for fluorine-19 NMR studies.
Trichlorofluoromethane was formerly used in the drinking bird novelty, largely because it has a boiling point of 23.77 °C (74.79 °F). The replacement, dichloromethane, boiling point 39.6 °C (103.3 °F), requires a higher ambient temperature to work.
Prior to the knowledge of the ozone depletion potential of chlorine in refrigerants and other possible harmful effects on the environment, trichlorofluoromethane was sometimes used as a cleaning/rinsing agent for low-pressure systems.
Trichlorofluoromethane was included in the production moratorium agreed in the Montreal Protocol of 1987. It is assigned an ozone depletion potential of 1.0, and U.S. production was ended on January 1, 1996.
In 2018, the atmospheric concentration of CFC-11 was noted by researchers to be declining more slowly than expected, and it subsequently emerged that it remains in widespread use as a blowing agent for polyurethane foam insulation in the construction industry of China. In 2021 researchers announced that emissions declined by 20,000 U.S. tons from 2018 to 2019, which mostly reversed the previous spike in emissions.
Decline of CFC-11 has slowed in recent years, pointing to a renewed source