Dimethylamine

Synonyms & Trade Names

Dimethylamine (anhydrous), N-Methylmethanamine

CAS No.

124-40-3

RTECS No.

IP8750000

DOT ID & Guide

1032 118(anhydrous)
1160 132(solution)

Formula

(CH₃)₂NH

Conversion

1 ppm = 1.85 mg/m³

IDLH

500 ppm
See: 124403

Exposure Limits

NIOSH REL

TWA 10 ppm (18 mg/m³)

OSHA PEL

TWA 10 ppm (18 mg/m³)

Measurement Methods

NIOSH 2010;
OSHA 34
See: NMAM or OSHA Methods

Physical Description

Colorless gas with an ammonia- or fish-like odor. [Note: A liquid below 44°F. Shipped as a liquefied compressed gas.]

Molecular Weight

45.1

Boiling Point

44°F

Freezing Point

-134°F

Solubility

(140°F): 24%

Vapor Pressure

1.7 atm

Ionization Potential

8.24 eV

Specific Gravity

0.67 (Liquid at 44°F)

Flash Point

NA (Gas) 20°F (Liquid)

Upper Explosive Limit

14.4%

Lower Explosive Limit

2.8%

Relative Gas Density

1.56

Flammable Gas

Incompatibilities & Reactivities

Strong oxidizers, chlorine, mercury, acraldehyde, fluorides, maleic anhydride, aluminum, brass, copper, zinc

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

Personal Protection/Sanitation

(See protection codes)
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

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

Important additional information about respirator selection

Dimethylamine

NIOSH REL

OSHA PEL

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