Refractive index database

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Optical constants of C2H4(OH)2 (Ethylene glycol)
Sani and Dell'Oro 2014: n,k 0.185–55.0 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Room temperature


1) E. Sani and A. Dell'Oro. Optical constants of ethylene glycol over an extremely wide spectral range, Optical Materials 37, 36-41 (2014)
2) E. Sani and A. Dell'Oro. Corrigendum to "Optical constants of ethylene glycol over an extremely wide spectral range", Optical Materials 48, 281 (2015)


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Ethylene glycol, C2H6O2

Ethylene glycol (C2H6O2) is a colorless, syrupy liquid with a sweet taste, though it is toxic if ingested. It is primarily used as an antifreeze in cooling and heating systems, thanks to its ability to lower the freezing point of water. Furthermore, ethylene glycol is a crucial precursor in the manufacture of polyester fibers and resins, including polyethylene terephthalate (PET), which is extensively used for plastic bottles and textiles. Due to its hygroscopic nature, it is also utilized as a desiccant in gas drying systems and in the production of capacitors. However, due to its toxicity, there are strict regulations regarding its disposal and it should be handled with care.

Chemical formula


Other names

  • Ethane-1,2-diol
  • 1,2-Ethanediol
  • Glycol
  • Ethylene Alcohol
  • Hypodicarbonous acid
  • Monoethylene glycol

External links