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Methyl chloride																				Related Pages
Synonyms & Trade Names
			Chloromethane, Monochloromethane
CAS No.
			74-87-3
	RTECS No.
			PA6300000
	DOT ID & Guide
			1063 115

FormulaCH3Cl
	Conversion
			1 ppm = 2.07 mg/m3
	IDLH
			Ca [2000 ppm]See: 74873

Exposure Limits
			NIOSH RELCa See Appendix A
					OSHA PEL TWA 100 ppm C 200 ppm 300 ppm (5-minute maximum peak in any 3 hours) See Appendix G
	Measurement Methods
			**NIOSH** 1001
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a faint, sweet odor which is not noticeable at dangerous concentrations.
					[Note: Shipped as a liquefied compressed gas.]													
										
Molecular Weight50.5	
	Boiling Point-12°F
	Freezing Point-144°F
	Solubility0.5%
	Vapor Pressure5.0 atm
	Ionization Potential11.28 eV											
Flash PointNA (Gas)
	Upper Explosive Limit17.4%
	Lower Explosive Limit8.1%
	Relative Gas Density1.78
Flammable Gas
Incompatibilities & Reactivities
			Chemically-active metals such as potassium, powdered aluminum, zinc & magnesium; water
					[Note: Reacts with water (hydrolyzes) to form hydrochloric acid.]
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			dizziness, nausea, vomiting; visual disturbance, stagger, slurred speech, convulsions, coma; liver, kidney damage; liquid: frostbite; reproductive, teratogenic effects; [potential occupational carcinogen]
Target Organs
			central nervous system, liver, kidneys, reproductive system
Cancer Site[in animals: lung, kidney & forestomach tumors]										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Frostbite
							**Eyes:**Frostbite
							**Wash skin:**No recommendation
							**Remove:**When wet (flammable)
							**Change:**No recommendation
							**Provide:**Frostbite wash
	First Aid
			(See procedures)**Eye:**Frostbite
							**Skin:**Frostbite
							**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:** Any appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0419
					  MEDICAL TESTS: 0140

			
							

			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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