Diethylamine is a secondary amine that is a flammable, strongly alkaline liquid. It is also very soluble, and can be mixed to form a solution with water and ethanol. It is a clear liquid which may appear brown because of it's impurities. It is volatile and has a strong nasty smell.
It can also be made from ethanol and ammonia and is obtained together with ethylamine and triethylamine. One of it's main uses is that of a corrosion inhibitor. It is also used in the production of dyes, resins, rubber and pharmaceuticals. This chemical is also used in the production of pesticides. It is used for the production of DEET, which can be found in many insect repellents that are sold in supermarkets and stores.
Diethylamine is also an extremely corrosive chemical. If it comes into contact with bare skin it will likely end up as a major burn or skin irritation.