Pure diethanolamine is a white solid at room temperature, but its tendencies to absorb water and to supercool[2] often results in it being found in a colorless, viscous liquid state.

[5] In oil refineries, a DEA in water solution is commonly used to remove hydrogen sulfide from sour gas.

[6][7] DEA is used in the production of diethanolamides, which are common ingredients in cosmetics and shampoos added to confer a creamy texture and foaming action.

[8] Some of the most commonly used diethanolamides include: DEA is a potential skin irritant in workers sensitized by exposure to water-based metalworking fluids.

[10] DEA is a key component of unusual phospholipids that are produced by Morganella morganii, a bacteria in the human microbiome, with elevated levels being linked to increased incidence of major depression.