NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

Dimethylamine (anhydrous), N-Methylmethanamine
DOT ID & Guide
1032 / 118 (anhydrous)
1160 / 132 (solution)


NIOSH REL: TWA 10 ppm (18 mg/m3)
OSHA PEL: TWA 10 ppm (18 mg/m3)
500 ppm See: 124403
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
Incompatibilities & Reactivities

Strong oxidizers, chlorine, mercury, acraldehyde, fluorides, maleic anhydride, aluminum, brass, copper, zinc
Measurement Methods
NIOSH 2010; OSHA 34
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 wash
First Aid
(See procedures)
Eye: Irrigate immediately (liquid)/Frostbite
Skin: Water flush immediately (liquid)/Frostbite
Breathing: Respiratory support

Respirator Recommendations
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
(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
Exposure Routes
inhalation, skin and/or eye contact (liquid)
Irritation nose, throat; sneezing, cough, dyspnea (breathing difficulty); pulmonary edema; conjunctivitis; dermatitis; liquid: frostbite
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0260