# NIOSH Pocket Guide to Chemical Hazards
Dimethylamine | CAS 124-40-3
(CH3)2NH | RTECS IP8750000
Synonyms & Trade Names Dimethylamine (anhydrous), N-Methylmethanamine | DOT ID & Guide 1032 118 (anhydrous) 1160 129 (solution)
Exposure Limits | NIOSH REL: TWA 10 ppm (18 mg/m3)
OSHA PEL: TWA 10 ppm (18 mg/m3)
IDLH 500 ppm | Conversion 1 ppm = 1.85 mg/m3
Physical Description Colorless gas with an ammonia- or fish-like odor. [Note: A liquid below 44°F. Shipped as a liquefied compressed gas.]
MW: 45.1 | BP: 44°F | FRZ: -134°F | Sol(140°F): 24%
VP: 1.7 atm | IP: 8.24 eV | RGasD: 1.56 | Sp.Gr: 0.67 (Liquid at 44°F)
Fl.P: NA (Gas) 20°F (Liquid) | UEL: 14.4% | LEL: 2.8% |
Flammable Gas Class IA Flammable Liquid
Incompatibilities & Reactivities Strong oxidizers, chlorine, mercury, acraldehyde, fluorides, maleic anhydride, aluminum, brass, copper, zinc
Measurement Methods NIOSH 2010; OSHA 34
Personal Protection & Sanitation Skin: Prevent skin contact (liquid)/Frostbite Eyes: Prevent eye contact (liquid)/Frostbite Wash skin: When contaminated (liquid) Remove: When wet (flammable) Change: No recommendation Provide: Eyewash (liquid), Quick drench (liquid), Frostbite | First Aid (See procedures) Eye: Irrigate immediately (liquid)/Frostbite Skin: Water flush immediately (liquid)/Frostbite Breathing: Respiratory support
Respirator Recommendations NIOSH/OSHA Up to 250 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£ Up to 500 ppm: (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 and/or eye contact (liquid)
Symptoms Irritation nose, throat; sneezing, cough, dyspnea (breathing difficulty); pulmonary edema; conjunctivitis; dermatitis; liquid: frostbite
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION