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Methylamine

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Synonyms & Trade Names
Aminomethane, Methylamine (anhydrous), Methylamine (aqueous), Monomethylamine
CAS No.
74-89-5
RTECS No.
PF6300000
DOT ID & Guide
1061 118(anhydrous)
1235 132(aqueous)
Formula
CH₃NH₂
Conversion
1 ppm = 1.27 mg/m3
IDLH
100 ppm
See: 74895
Exposure Limits
NIOSH REL
TWA 10 ppm (12 mg/m3)
OSHA PEL
TWA 10 ppm (12 mg/m3)
Measurement Methods
OSHA 40
See: NMAM or OSHA Methods
Physical Description
Colorless gas with a fish- or ammonia-like odor. [Note: A liquid below 21°F. Shipped as a liquefied compressed gas.]
Molecular Weight
31.1
Boiling Point
21°F
Freezing Point
-136°F
Solubility
Soluble
Vapor Pressure
3.0 atm
Ionization Potential
8.97 eV
Specific Gravity
0.70 (Liquid at 13°F)
Flash Point
NA (Gas) 14°F (Liquid)
Upper Explosive Limit
20.7%
Lower Explosive Limit
4.9%
Relative Gas Density
1.08
Flammable Gas
Incompatibilities & Reactivities
Mercury, strong oxidizers, nitromethane [Note: Corrosive to copper & zinc alloys, aluminum & galvanized surfaces.]
Exposure Routes
inhalation, skin absorption (solution), ingestion (solution), skin and/or eye contact (solution/liquid)
Symptoms
irritation eyes, skin, respiratory system; cough; skin, mucous membrane burns; dermatitis; conjunctivitis; liquid: frostbite
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact (solution)/Frostbite
Eyes:Prevent eye contact (solution)/Frostbite
Wash skin:When contaminated (solution)
Remove:When wet (flammable)
Change:No recommendation
Provide:Frostbite wash
First Aid
(See procedures)
Eye:Irrigate immediately (solution)/Frostbite
Skin:Water flush immediately (solution)/Frostbite
Breathing:Respiratory support
Swallow:Medical attention immediately (solution)
Respirator Recommendations

NIOSH/OSHA

Up to 100 ppm:
(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern
(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern£
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(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 canister providing protection against the compound of concern
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 1483
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health