CAS RN:75-46-7

Toxicity Summary

IDENTIFICATION AND USE: Trifluoromethane (FC-23) is a colorless, odorless gas, or liquefied gas. It is used as refrigerant, intermediate in organic synthesis, direct coolant for infrared detector cells, blowing agent for urethane foams, and component in etch gas for integrated circuits material. HUMAN EXPOSURE AND TOXICITY: Five normal healthy male volunteers were exposed to concentrations of FC-23 between 10% and 60% (randomly interleaved with exposures to both room air and 40% nitrous oxide) in a within-subjects, double-blind design. Analyses of individual cases and ranked group data showed that individuals tolerated the 30% concentration of FC-23. ANIMAL STUDIES: In cats, inhaled at 60%, trifluoromethane had no effect on cerebral blood flow, the cerebral metabolic rate for oxygen, or oxyhemoglobin content. At 70%, trifluoromethane sensitized the cats' hearts to epinephrine, but to a much lesser degree than 40% chlorodifluoromethane, and produced only moderate changes in cerebral electrical activity as measured by the electroencephalogram. In other study, the acute cardiac and central nervous system effects of trifluoromethane were evaluated in eight anesthetized baboons. A dose-response effect was established for respiratory rate, electroencephalogram, and cardiac sinus rate, which exhibited a stepwise decrease from 10% trifluoromethane. No spontaneous arrhythmias were noted, and arterial blood pressure remained unchanged at any inspired level. Intravenous epinephrine infusions induced transient cardiac arrhythmia in 1 animal only at 70% (v/v) trifluoromethane. Trifluoromethane appears to induce mild dose-related physiological changes at inspired levels of 30% or more, indicative of an anesthetic effect. It significantly increased mutation rates in progeny of Drosophila over control levels.
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