Ethylene oxide

CAS Registry Number®

75-21-8

CAS Name

Ethylene oxide

Molecular Formula

C2H4O

Molecular Mass

44.05

Cite this Page

Ethylene oxide.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/ChemicalDetail.aspx?ref=75-21-8 (retrieved 2025-07-12) (CAS RN: 75-21-8).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    10.7 °C @ Press: 760 Torr

  • Melting Point (1)

    -111 °C

  • Density (1)

    0.882 g/cm³ @ Temp: 10 °C

Source(s)

  • (1) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)

Other Names and Identifiers

InChI

InChI=1S/C2H4O/c1-2-3-1/h1-2H2

InChIKey

InChIKey=IAYPIBMASNFSPL-UHFFFAOYSA-N

SMILES

C1CO1

Canonical SMILES

O1CC1

Other Names for this Substance

  • Oxirane
  • Ethylene oxide
  • Ethyleneoxy
  • Dihydrooxirene
  • Dimethylene oxide

View All

Deleted or Replaced CAS Registry Numbers

99932-75-9, 142175-32-4, 19034-08-3, 37341-05-2, 436859-78-8, 184288-32-2

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