Triethylene glycol (TEG):

TEG is a type of glycol. It is compound that contains three molecules and is a raw material for synthetic resins.

It is flammable, does not omit toxic vapor or cause skin uptake so it is usually used for solvents.

Diethylene glycol and triethylene glycol have a higher boiling points and are stickier than monoethylene glycol.

Other characteristics are similar so it is also used as a raw material of synthetic resin.