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Methyl bromide																				Related Pages
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 RELCa See Appendix A
					OSHA PEL C 20 ppm (80 mg/m3) [skin] See Appendix G
	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.]													
										
Molecular Weight95.0	
	Boiling Point38°F
	Freezing Point-137°F
	Solubility2%
	Vapor Pressure1.9 atm
	Ionization Potential10.54 eV											
Specific Gravity1.73 (Liquid at 32°F)	
	Flash PointNA (Gas)
	Upper Explosive Limit16.0%
	Lower Explosive Limit10%
	Relative Gas Density3.36
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
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 canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0109
					  MEDICAL TESTS: 0138

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
CAS Numbers
RTECS Numbers
Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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