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| Methyl bromide | CAS 74-83-9 | ||
| CH3Br | RTECS PA4900000 | ||
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Synonyms & Trade Names Bromomethane, Monobromomethane |
DOT ID & Guide 1062 123 |
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Exposure Limits |
NIOSH REL: Ca See Appendix A | ||
| OSHA PEL�: C 20 ppm (80 mg/m3) [skin] | |||
| IDLH Ca [250 ppm] | 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 |
BP: 38°F |
FRZ: -137°F |
Sol: 2% |
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VP: 1.9 atm |
IP: 10.54 eV |
RGasD: 3.36 |
Sp.Gr: 1.73 (Liquid at 32°F) |
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Fl.P: NA (Gas) |
UEL: 16.0% |
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 |
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Personal Protection & Sanitation 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) |
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 |
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| Exposure Routes inhalation, skin absorption (liquid), skin and/or eye contact (liquid) | |
| 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 |