TABLE 6-1 Physical and Chemical Properties of Freon 114

Synonyms and trade names

FC-114, cryofluorane, fluorocarbon 114, dichlorotetrafluoroethane, 1,2-dichlorotetrafluoroethane, halocarbon 114, tetrafluorodichloroethane, 1,1,2,2-tetrafluoro-1,2-dichloroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane

CAS registry number

76-14-2

Molecular formula

C2Cl2F4

Molecular weight

170.93

Boiling point

3.8°C

Melting point

−94°C

Flash point

Nonflammable

Explosive limits

NA

Specific gravity of liquid

1.5312 at 0°C

Vapor pressure

1,444 mm Hg at 20°C

Solubility

Soluble in ether, alcohol, water (0.01%)

Conversion factors

1 ppm = 7 mg/m3; 1 mg/m3 = 0.14 ppm

Abbreviations: NA, not available or not applicable.

Sources: Flash point from OSHA 1999; all other data from Budavari et al. 1989, 1996; NRC 1984.

8 ppm (range, 0-99 ppm) (Hagar 2003). Holdren et al. (1995) reported the results of air sampling at three locations conducted over 6 h during the missions of two submarines. Sampling indicated concentrations of 1.225-1.540 ppm and 0.822-0.914 ppm, depending on the collection method, on one submarine and 1.608-2.072 ppm and 1.256-1.490 ppm, depending on the collection method, on the other submarine. Raymer et al. (1994) report the results of a similar sampling exercise (two submarines, three locations, and sampling duration of 6 h). Freon 114 concentrations were reported as 4.2 and 7.0 ppm in the fan rooms, 2.8 and 7.0 ppm in the galleys, and 5.6 ppm in the engine rooms.

SUMMARY OF TOXICITY

The toxicity of Freon 114 has been studied in a number of mammalian species for acute effects, particularly those involving cardiopulmonary function. Few repeat-exposure studies have been conducted with Freon 114. Most of the studies with Freon 114 were conducted before 1975, and only a few toxicity end points were included. Freon 114, like other chlorofluorocarbons (CFCs), has a relatively low degree of acute toxicity by inhalation (for example, the 2-h inhalation LC50 in rats is over 600,000 ppm); central nervous system (CNS) and pulmonary-depressant and cardiac-sensitizing effects occur at relatively high exposure concentrations. Estimated EC50 values in dogs for cardiac sensitization



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