# NIOSH Pocket Guide to Chemical Hazards
Trimethylamine | CAS 75-50-3
(CH3)3N | RTECS PA0350000
Synonyms & Trade Names N,N-Dimethylmethanamine; TMA [Note: May be used in an aqueous solution (typically 25%, 30%, or 40% TMA.] | DOT ID & Guide 1083 118 (anhydrous) 1297 132 (aqueous solution)
Exposure Limits | NIOSH REL: TWA 10 ppm (24 mg/m3) ST 15 ppm (36 mg/m3)
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 2.42 mg/m3
Physical Description Colorless gas with a fishy, amine odor. [Note: A liquid below 37°F. Shipped as a liquefied compressed gas.]
MW: 59.1 | BP: 37°F | FRZ: -179°F | Sol(86°F): 48%
VP(70°F): 1454 mmHg | IP: 7.82 eV | RGasD: 2.09 |
Fl.P: NA (Gas) 20°F (Liquid) | UEL: 11.6% | LEL: 2.0% |
Flammable Gas Class IA Flammable Liquid
Incompatibilities & Reactivities Strong oxidizers (including bromine), ethylene oxide, nitrosating agents (e.g., sodium nitrite), mercury, strong acids [Note: Corrosive to many metals (e.g., zinc, brass, aluminum, copper).]
Measurement Methods OSHA PV2060
Personal Protection & Sanitation Skin: Prevent skin contact (liquid/solution)/Frostbite Eyes: Prevent eye contact (liquid/solution)/Frostbite Wash skin: When contaminated (solution) Remove: When wet (flammable) Change: No recommendation Provide: Eyewash (liquid/solution), Quick drench (liquid/solution), Frostbite | First Aid (See procedures) Eye: Irrigate immediately (liquid/solution)/Frostbite Skin: Water flush immediately (liquid/solution)/Frostbite Breathing: Respiratory support Swallow: Medical attention immediately (solution)
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion (solution), skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat, respiratory system; cough, dyspnea (breathing difficulty), delayed pulmonary edema; blurred vision, corneal necrosis; skin burns; liquid: frostbite
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION