Methyl chloride
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CAS
74-87-3
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CH3Cl
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RTECS
PA6300000
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Synonyms & Trade Names
Chloromethane, Monochloromethane
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DOT ID & Guide
1063 / 115
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Exposure
Limits
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NIOSH REL: Ca See Appendix A
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OSHA PEL†: TWA 100 ppm C 200 ppm 300 ppm (5-minute maximum peak in any 3 hours)
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IDLH
Ca [2000 ppm]
See: 74873
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Conversion
1 ppm = 2.07 mg/m3
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Physical Description
Colorless gas with a faint, sweet odor which is not noticeable at dangerous concentrations. [Note: Shipped as a liquefied compressed gas.]
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MW: 50.5
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BP: -12°F
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FRZ: -144°F
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Sol: 0.5%
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VP: 5.0 atm
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IP: 11.28 eV
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RGasD: 1.78
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Fl.P: NA (Gas)
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UEL: 17.4%
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LEL: 8.1%
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Flammable Gas
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Incompatibilities & Reactivities
Chemically-active metals such as potassium, powdered aluminum, zinc & magnesium; water [Note: Reacts with water (hydrolyzes) to form hydrochloric acid.]
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Measurement Methods
NIOSH 1001
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
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First Aid (See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support
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Respirator Recommendations
NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape: Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, skin and/or eye contact (liquid)
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Symptoms
Dizziness, nausea, vomiting; visual disturbance, stagger, slurred speech, convulsions, coma; liver, kidney damage; liquid: frostbite; reproductive, teratogenic effects; [potential occupational carcinogen]
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Target Organs
central nervous system, liver, kidneys, reproductive system
Cancer Site
[in animals: lung, kidney & forestomach tumors]
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See also: INTRODUCTION
See ICSC CARD: 0419 See MEDICAL TESTS: 0140
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