Methyl bromide
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CAS
74-83-9
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CH3Br
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RTECS
PA4900000
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Synonyms & Trade Names
Bromomethane, Monobromomethane
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DOT ID & Guide
1062 / 123
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Exposure
Limits
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NIOSH REL: Ca See Appendix A
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OSHA PEL†: C 20 ppm (80 mg/m3) [skin]
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IDLH
Ca [250 ppm]
See: 74839
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Conversion
1 ppm = 3.89 mg/m3
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Physical Description
Colorless gas with a chloroform-like odor at high concentrations. [Note: A liquid below 38°F. Shipped as a liquefied compressed gas.]
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MW: 95.0
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BP: 38°F
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FRZ: -137°F
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Sol: 2%
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VP: 1.9 atm
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IP: 10.54 eV
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RGasD: 3.36
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Sp.Gr: 1.73 (Liquid at 32°F)
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Fl.P: NA (Gas)
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UEL: 16.0%
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LEL: 10%
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Flammable Gas, but only in presence of a high energy ignition source.
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Incompatibilities & Reactivities
Aluminum, magnesium, strong oxidizers [Note: Attacks aluminum to form aluminum trimethyl, which is SPONTANEOUSLY flammable.]
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Measurement Methods
NIOSH 2520; OSHA PV2040
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact (liquid)
Eyes: Prevent eye contact (liquid)
Wash skin: When contaminated (liquid)
Remove: When wet (flammable)
Change: No recommendation
Provide: Quick drench (liquid)
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First Aid (See procedures)
Eye: Irrigate immediately (liquid)
Skin: Water flush immediately (liquid)
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:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, skin absorption (liquid), skin and/or eye contact (liquid)
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Symptoms
Irritation eyes, skin, respiratory system; muscle weakness, incoordination, visual disturbance, dizziness; nausea, vomiting, headache; malaise (vague feeling of discomfort); hand tremor; convulsions; dyspnea (breathing difficulty); skin vesiculation; liquid: frostbite; [potential occupational carcinogen]
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Target Organs
Eyes, skin, respiratory system, central nervous system
Cancer Site
[in animals: lung, kidney & forestomach tumors]
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See also: INTRODUCTION
See ICSC CARD: 0109 See MEDICAL TESTS: 0138
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