Methyl bromide |
Synonyms & Trade Names Bromomethane, Monobromomethane |
CAS No. 74-83-9 |
RTECS No. PA4900000 |
DOT ID & Guide 1062 123 |
FormulaCH3Br |
Conversion 1 ppm = 3.89 mg/m3 |
IDLH Ca [250 ppm]
See: 74839 |
Exposure Limits NIOSH REL: Ca See Appendix A
OSHA PEL†: C 20 ppm (80 mg/m3) [skin] |
Measurement Methods
NIOSH 2520;
OSHA PV2040
See: NMAM or OSHA Methods |
Physical Description Colorless gas with a chloroform-like odor at high concentrations. [Note: A liquid below 38°F. Shipped as a liquefied compressed gas.] |
MW: 95.0 |
BP: 38°F |
FRZ: -137°F |
Sol: 2% |
VP: 1.9 atm |
IP: 10.54 eV |
Sp.Gr: 1.73 (Liquid at 32°F) |
Fl.P: NA (Gas) |
UEL: 16.0% |
LEL: 10% |
RGasD: 3.36 |
|
| Flammable Gas, but only in presence of a high energy ignition source. |
Incompatibilities & Reactivities Aluminum, magnesium, strong oxidizers [Note: Attacks aluminum to form aluminum trimethyl, which is SPONTANEOUSLY flammable.] |
Exposure Routes inhalation, skin absorption (liquid), skin and/or eye contact (liquid) |
Symptoms irritation eyes, skin, respiratory system; muscle weak, 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] |
Target Organs Eyes, skin, respiratory system, central nervous system |
Cancer Site[in animals: lung, kidney & forestomach tumors] |
Personal Protection/Sanitation (See protection codes)
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
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 0109 See MEDICAL TESTS: 0138 |
