Also known as: Chloromethane. CAS Number: 74-87-3. A colorless
liquid with a faint, sweet odor. It is used mainly in the
production of silicones, where it is used to make methylate
silicon. Also used in the production of agricultural and other
chemicals. Was used in refrigerators in the past, but has been
replaced by newer refrigerants such as Freon. Chemical formula =
CH3Cl. Molecular weight = 50.49 g/mol.
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Low levels of methyl chloride occur naturally in the environment.
Higher levels may occur at chemical plants where it is made or
used. Acute (short-term) exposure to high concentrations of
methyl chloride in humans has caused severe neurological effects.
Methyl chloride has also caused effects on the heart rate, blood
pressure, liver, and kidneys in humans. Chronic (long-term)
animal studies have shown liver, kidney, spleen, and central
nervous system (CNS) effects. Inhalation studies have
demonstrated that methyl chloride causes reproductive effects in
male rats, with effects such as testicular lesions and decreased
sperm production. Human cancer data are limited. EPA has
classified methyl chloride as a Group D carcinogen (not
classifiable as to human carcinogenicity).