# NIOSH Pocket Guide to Chemical Hazards
Methylamine | CAS 74-89-5
CH3NH2 | RTECS PF6300000
Synonyms & Trade Names Aminomethane, Methylamine (anhydrous), Methylamine (aqueous), Monomethylamine | DOT ID & Guide 1061 118 (anhydrous) 1235 132 (aqueous)
Exposure Limits | NIOSH REL: TWA 10 ppm (12 mg/m3)
OSHA PEL: TWA 10 ppm (12 mg/m3)
IDLH 100 ppm | Conversion 1 ppm = 1.27 mg/m3
Physical Description Colorless gas with a fish- or ammonia-like odor. [Note: A liquid below 21°F. Shipped as a liquefied compressed gas.]
MW: 31.1 | BP: 21°F | FRZ: -136°F | Sol: Soluble
VP: 3.0 atm | IP: 8.97 eV | RGasD: 1.08 | Sp.Gr: 0.70 (Liquid at 13°F)
Fl.P: NA (Gas) 14°F (Liquid) | UEL: 20.7% | LEL: 4.9% |
Flammable Gas Class IA Flammable Liquid
Incompatibilities & Reactivities Mercury, strong oxidizers, nitromethane [Note: Corrosive to copper & zinc alloys, aluminum & galvanized surfaces.]
Measurement Methods OSHA 40
Personal Protection & Sanitation 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 | 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
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
See also: INTRODUCTION