Triethylene glycol, TEG, or triglycol is a colorless odorless viscous liquid with molecular formula HOCH2CH2OCH2CH2OCH2CH2OH.

Apart from its use as a raw material in the manufacture and synthesis of other products, TEG is known for its hygroscopic quality and its ability to dehumidify fluids.

Triethylene glycol is well established as a relatively mild disinfectant toward a variety of bacteria, influenza A viruses and spores of Penicillium notatum fungi.

[5] Since the first report the following microorganisms have been reported in the literature to be inactivated in the air: Penicillium notatum spores,[6] Chlamydophila psittaci (original citation: meningopneumonitis virus strain Cal 10 and psittacosis virus strain 6BC),[7] Group C streptococcus,[8] type 1 pneumococcus,[8] Staphylococcus albus,[8] Escherichia coli,[9] and Serratia marcescens Bizio (ATCC 274).

[13] The latter investigation suggests that triethylene glycol may prove to be a potent weapon against future influenza epidemics and pandemics.