Ethylene oxide

Ethylene oxide
Names
	Preferred IUPAC name Oxirane
	Systematic IUPAC name Epoxyethane; Oxacyclopropane
	Other names Ethylene oxide; Dimethylene oxide; 1,2-Epoxyethane; [3]-crown-1; Epoxide
Identifiers
CAS Number	75-21-8 ;
3D model (JSmol)	Interactive image;
Abbreviations	EO, EtO
ChEBI	CHEBI:27561 ;
ChemSpider	6114 ;
ECHA InfoCard	100.000.773
EC Number	200-849-9;
KEGG	D03474 ;
MeSH	Ethylene+Oxide
PubChem CID	6354;
RTECS number	KX2450000;
UNII	JJH7GNN18P ;
CompTox Dashboard (EPA)	DTXSID0020600 ;
	SMILES C1CO1;
Properties
Chemical formula	C2H4O
Molar mass	44.052 g·mol−1
Appearance	Colorless gas
Odor	Ether-like
Density	0.8821 g·cm−3
Melting point	−112.46 °C (−170.43 °F; 160.69 K)
Boiling point	10.4 °C (50.7 °F; 283.5 K)
Solubility in water	Miscible
Vapor pressure	1.46 atm (20 °C)
Magnetic susceptibility (χ)	−30.5·10−6 cm3/mol
Refractive index (nD)	1.3597 (589 nm)
Dipole moment	1.94 D
Thermochemistry
Std enthalpy of; formation ΔfHo298	−52.6 kJ·mol−1
Standard molar; entropy So298	242.5 J·mol−1·K−1
Specific heat capacity, C	47.9 J·mol−1·K−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Carcinogen; Extremely flammable
	GHS labelling:
Pictograms
Hazard statements	H220, H280, H301+H331, H314, H335, H336, H340, H350, H360, H372, H402
Precautionary statements	P201, P202, P210, P260, P264, P270, P271, P273, P280, P301+P310+P330, P301+P330+P331, P303+P361+P353, P304+P340+P310
NFPA 704 (fire diamond)	3 4 3
Flash point	−20 °C (−4 °F; 253 K)
Autoignition; temperature	429 °C (804 °F; 702 K)
Explosive limits	3 to 100%
	Lethal dose or concentration (LD, LC):
LC50 (median concentration)	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)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 ppm 5 ppm [15-minute excursion]
REL (Recommended)	Ca TWA <0.1 ppm (0.18 mg/m3) C 5 ppm (9 mg/m3) [10-min/day]
IDLH (Immediate danger)	Ca [800 ppm]
Safety data sheet (SDS)	ICSC 0155; Sigma-Aldrich Co., product no. 387614.
Related compounds
Related heterocycles	Aziridine,; Thiirane,; Borirane
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Ethylene oxide, called oxirane by IUPAC, is an organic compound with the chemical formula C
₂H
₄O.^[7] It is the simplest epoxide.

References

1 2 3 4 5 Haynes, p. 3.430
1 2 3 4 NIOSH Pocket Guide to Chemical Hazards. "#0275". National Institute for Occupational Safety and Health (NIOSH).
↑ Haynes, p. 3.576
1 2 3 Haynes, p. 5.22
1 2 Haynes, p. 15.20
↑ "Ethylene oxide". Immediately Dangerous to Life or Health Concentrations. National Institute for Occupational Safety and Health.
↑ Rebsdat, Siegfried and Mayer, Dieter (2005) "Ethylene Oxide" in Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim. doi:10.1002/14356007.a10_117.

[r3430-1] 1 2 3 4 5 Haynes, p. 3.430

[PGCH-2] 1 2 3 4 NIOSH Pocket Guide to Chemical Hazards. "#0275". National Institute for Occupational Safety and Health (NIOSH).

[3] Haynes, p. 3.576

[r522-4] 1 2 3 Haynes, p. 5.22

[r1520-5] 1 2 Haynes, p. 15.20

[6] "Ethylene oxide". Immediately Dangerous to Life or Health Concentrations. National Institute for Occupational Safety and Health.

[7] Rebsdat, Siegfried and Mayer, Dieter (2005) "Ethylene Oxide" in Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH, Weinheim. doi:10.1002/14356007.a10_117.

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