Ethylene oxide
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| Names | |||
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IUPAC name
oxirane
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| Other names
epoxyethane, ethylene oxide, dimethylene oxide, oxacyclopropane, 1,2-Epoxy ethane
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| Identifiers | |||
75-21-8 
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| 3D model (Jmol) | Interactive image | ||
| Abbreviations | EO, EtO | ||
| ChEBI |
CHEBI:27561
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| ChemSpider |
6114
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| ECHA InfoCard | 100.000.773 | ||
| EC Number | 200-849-9 | ||
| KEGG |
D03474
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| MeSH | Ethylene+Oxide | ||
| PubChem | 6354 | ||
| RTECS number | KX2450000 | ||
| UNII |
JJH7GNN18P
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| Properties | |||
| C2H4O | |||
| Molar mass | 44.05 g mol−1 | ||
| Appearance | colorless gas | ||
| Odor | ether-like | ||
| Density | 0.882 g/mL, 7.360 lbs/gallon | ||
| Melting point | −111.3 °C (−168.3 °F; 161.8 K) | ||
| Boiling point | 10.7 °C (51.3 °F; 283.8 K) | ||
| miscible | |||
| Vapor pressure | 1.46 atm (20°C) | ||
| -30.7·10−6 cm3/mol | |||
| Thermochemistry | |||
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Std molar
entropy (S |
243 J mol−1 K−1 | ||
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Std enthalpy of
formation (ΔfH |
−52.6 kJ mol−1 | ||
| Hazards | |||
| Main hazards |
carcinogen extremely flammable |
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| Safety data sheet | ICSC 0155 | ||
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EU classification (DSD)
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 F+  TCarc. Cat. 1 |
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| R-phrases | R45, R46, R12, R23, R36/37/38 | ||
| S-phrases | S53, S45 | ||
| NFPA 704 | |||
| Flash point | −20 °C (−4 °F; 253 K) | ||
| 429 °C (804 °F; 702 K) | |||
| Explosive limits | 3 to 100% | ||
| Lethal dose or concentration (LD, LC): | |||
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LC50 (median concentration)
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836 ppm (mouse, 4 hr) 4000 ppm (rat, 4 hr) 800 ppm (rat, 4 hr) 819 ppm (guinea pig, 4 hr) 1460 ppm (rat, 4 hr) 835 ppm (mouse, 4 hr) 960 ppm (dog, 4 hr) |
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| US health exposure limits (NIOSH): | |||
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PEL (Permissible)
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TWA 1 ppm 5 ppm [15-minute Excursion] | ||
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REL (Recommended)
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Ca TWA <0.1 ppm (0.18 mg/m3) C 5 ppm (9 mg/m3) [10-min/day] | ||
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IDLH (Immediate danger)
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Ca [800 ppm] | ||
| Related compounds | |||
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Related heterocycles
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Aziridine, Thiirane, Borirane |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is  ?) |
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| Infobox references | |||
Ethylene oxide, properly called oxirane by IUPAC, is the organic compound with the formula C
2H
4O. It is a cyclic ether. (A cyclic ether consists of an alkane with an oxygen atom bonded to two carbon atoms of the alkane, forming a ring.) Ethylene oxide is a colorless flammable gas at room temperature, with a faintly sweet odor; it is the simplest epoxide: a three-membered ring consisting of one oxygen atom and two carbon atoms. Because of its special molecular structure, ethylene oxide easily participates in addition reactions; e.g., opening its ring and thus easily polymerizing. Ethylene oxide is isomeric with acetaldehyde and with vinyl alcohol.
Although it is a vital raw material with diverse applications, including the manufacture of products like polysorbate 20 and polyethylene glycol (PEG) that are often more effective and less toxic than alternative materials, ethylene oxide itself is a very hazardous substance. At room temperature it is a flammable, carcinogenic, mutagenic, irritating, and anaesthetic gas, with a misleadingly pleasant aroma.
The chemical reactivity that is responsible for many of ethylene oxide's hazards has also made it a key industrial chemical. Although too dangerous for direct household use and generally unfamiliar to consumers, ethylene oxide is used industrially for making many consumer products as well as non-consumer chemicals and intermediates. Ethylene oxide is important or critical to the production of detergents, thickeners, solvents, plastics, and various organic chemicals such as ethylene glycol, ethanolamines, simple and complex glycols, polyglycol ethers and other compounds. As a poison gas that leaves no residue on items it contacts, pure ethylene oxide is a disinfectant that is widely used in hospitals and the medical equipment industry to replace steam in the sterilization of heat-sensitive tools and equipment, such as disposable plastic syringes.
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