ABSTRACT
CASRN: 75-71-8; DOT: 1028; DOT label: Nonflammable gas; molecular formula: CCl2F2; FW: 120.91; RTECS: PA8200000; Merck Index: 12, 3114 Physical state, color, and odor: Colorless gas with an ethereal odor Melting point (°C): -158 (Weast, 1986) Boiling point (°C): -29.75 (Kang et al., 1998) Density (g/cm3): 1.329 at 20 °C (quoted, Verschueren, 1983) 1.311 at 25 °C (quoted, Horvath, 1982) Diffusivity in water (x 10-5 cm2/sec): 0.93 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): Nonflammable (Weiss, 1986) Lower explosive limit (%): Nonflammable (Weiss, 1986) Upper explosive limit (%): Nonflammable (Weiss, 1986) Henry’s law constant (x 10 atm⋅m3/mol): 4.0 at 20 °C (Pearson and McConnell, 1975) 1.72, 2.63, and 3.91 at 10, 20, and 30 °C, respectively (Munz and Roberts, 1987) Ionization potential (eV): 11.75 (NIOSH, 1997) 12.31 ± 0.05 (Franklin et al., 1969) Soil organic carbon/water partition coefficient, log Koc: 2.56 using method of Kenaga and Goring (1980) Octanol/water partition coefficient, log Kow: 2.16 (Hansch et al., 1975)
Soluble in acetic acid, acetone, chloroform, ether (Weast, 1986), and ethanol (ITII, 1986) Solubility in water (mg/L at 25 °C): 280 (Pearson and McConnell, 1975) 301 (quoted, Munz and Roberts, 1987) Vapor density: 4.94 g/L at 25 °C, 4.17 (air = 1) Vapor pressure (mmHg): 4,250 at 20 °C, 5,776 at 30 °C (quoted, Verschueren, 1983) 4,870 at 25 °C (Jordan, 1954) 4,306 at 20 °C (McConnell et al., 1975) Environmental fate: Surface Water. Estimated half-lives of dichlorodifluoromethane from an experimental marine mesocosm during the spring (8-16 °C) and winter (3-7 °C) were 20 and 13 d, respectively (Wakeham et al., 1983). Exposure limits: NIOSH REL: TWA 1,000 ppm (4,950 mg/m3), IDLH 15,000 ppm; OSHA PEL: TWA 1,000 ppm; ACGIH TLV: TWA 1,000 ppm (adopted). Toxicity: LC50 (inhalation) for guinea pigs 80 pph/30-min, mice 76 pph/30-min, rats 80 pph/30-min, rabbits 80 pph/30-min (quoted, RTECS, 1985). LD50 for rats >1 g/kg (quoted, Verschueren, 1983). Drinking water standard: No MCLGs or MCLs have been proposed, however, a DWEL of 5 mg/L was recommended (U.S. EPA, 2000). Uses: Refrigerant; aerosol propellant; plastics; blowing agent; low temperature solvent; chilling cocktail glasses; freezing foods by direct contact; leak-detecting agent.
