NIOSH Pocket Guide to Chemical Hazards

Diethanolamine CAS 111-42-2
Synonyms & Trade Names
DEA; Di(2-hydroxyethyl)amine; 2,2'-Dihydroxydiethyamine; Diolamine; bis(2-Hydroxyethyl)amine; 2,2'-Iminodiethanol
DOT ID & Guide
NIOSH REL: TWA 3 ppm (15 mg/m3)
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 4.30 mg/m3
Physical Description
Colorless crystals or a syrupy, white liquid (above 82°F) with a mild, ammonia-like odor.
MW: 105.2
BP: 516°F (Decomposes)
MLT: 82°F
Sol: 95%
VP: <0.01 mmHg
IP: ?

Sp.Gr: 1.10
Fl.P: 279°F
UEL: 9.8%
LEL: 1.6%

Class IIIB Combustible Liquid
Combustible Solid
Incompatibilities & Reactivities
Oxidizers, strong acids, acid anhydrides, halides [Note: Reacts with CO2 in the air. Hygroscopic (i.e., absorbs moisture from the air). Corrosive to copper, zinc & galvanized iron.]
Measurement Methods
NIOSH 3509; OSHA PV2018
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; eye burns, corneal necrosis; skin burns; lacrimation (discharge of tears), cough, sneezing
Target Organs Eyes, skin, respiratory system