Trifluoromethane, also known as Halocarbon-23, is a colorless, nonflammable, liquefied gas with a slight ethereal odor. Trifluoromethane is considered an asphyxiant. At very high concentrations, it may cause dizziness, nausea, vomiting, disorientation, confusion, incoordination, and narcosis—effects due to suffocation. Lack of oxygen can kill. Liquid trifluoromethane may cause frostbite; harmful amounts may be absorbed if skin contact is prolonged or widespread. Frostbite of the tissues may occur if the gas comes in contact. At very high concentrations, trifluoromethane may produce cardiac arrhythmias or arrest due to sensitization of the heart to adrenaline and noradrenalin. Exposure to fluorocarbon thermal decomposition products may produce flu-like symptoms including chills, fever, weakness, muscular aches, headache, chest discomfort, sore throat, and dry cough. Complete recovery usually occurs within 24 hours after exposure.

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