ETHYLENE OXIDE‡
CAS # | 75-21-8 |
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Formula |
C₂H₄O |
Synonyms |
dimethylene oxide; 1,2-epoxyethane; oxirane; ETO |
Physical description | Colorless gas or liquid (below 51°F) with an ether-like odor. | ||
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Boiling point | 51°F | Molecular weight | 44.1 |
Freezing point/melting point | -171°F | Vapor pressure | 1.46 atm |
Flash point | -20°F (liquid) | Vapor density | 1.49 |
Specific gravity | 0.82 (liquid at 50°F) | Ionization potential | 10.56 eV |
Lower explosive limit (LEL) | 3.0% | Upper explosive limit (UEL) | 100% |
NFPA health rating | 3 | NFPA fire rating | 4 |
NFPA reactivity rating | 3 | NFPA special instruction | |
Vapor hazard ratio (VHR) | |||
Historical exceedance percentage | |||
Target organs |
Analyte code (IMIS no.) | 1190 | ||
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Sampling group | |||
Sampler/Sampling media | HBr coated Anasorb 747 (100/50 mg) [SKC 226-178] | ||
Sampling time* | 240 min |
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Sampling volume (TWA)* | 12 L |
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Sampling flow rate (TWA)* | 0.05 L/min |
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Sampling volume (STEL/Peak/C)* | 0.75 L |
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Sampling flow rate (STEL/Peak/C)* | 0.05 L/min |
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Analytical method instruments | GC-ECD | ||
Method reference | OSHA 1010v.2 (fully validated) | ||
Notes |
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Special requirements |
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* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
Wipe Sampler/Sampling media |
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Bulk Method |
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Device | Detector tubes | Detector tubes | Detector tube | Detector tube | Detector tube | CMS Chip |
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Model/Type | Dräger - Ethylene oxide 1/a, 6728961; Ethylene oxide 25/a, 6728241 | Gastec 163LL, 163L | Gastec 163 | Matheson-Kitagawa 8014-122SC | Matheson-Kitagawa 8014-122SA | Ethylene oxide, 0.4-5 ppm range |
Sampling information (see manufacturer instructions) |
1/a: 20 strokes, 1-15 ppm range, uncertainty 32%. 25/a: 30 strokes, 10-500 ppm range, uncertainty 32% | 163 LL: 2-4 strokes, 0.5-10 ppm range, uncertainty 25% for 0.1-0.5 ppm, 16% for 1-5 ppm. 163L: 1-4 strokes, 0.1-350 ppm range, uncertainty 25% for 1-20 ppm, 16% for 20-100 ppm | 1 stroke, 0.02-3% range, uncertainty 16% for 0.05-1%, 8% for 1-3% | follow mfr instructions, approx 1-15 ppm range | follow mfr instructions, approx 0.01-4% range |
OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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PEL-TWA |
1 ppm [0.5 ppm Action Level] |
REL-TWA |
<0.1 ppm (<0.18 mg/m³) |
TLV-TWA |
1 ppm [1990] |
PEL-TWA |
1 ppm (2 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
5 ppm |
PEL-C |
5 ppm [15 minute excursion limit] |
REL-C |
5 ppm (9 mg/m³)[10 minutes] |
TLV-C |
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PEL-C |
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Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A |
Notes:
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Notes:
See also 5220. Ethylene Oxide |
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Health factors: See NIH-NLM PubChem. | IDLH |
800 ppm |
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Carcinogenic classifications: IARC-1, NIOSH-Ca, NTP-K, OSHA-Ca, TLV-A2 |
Notes:
Ca |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
--/50 ppm/500 ppm |
Additional Resources and Literature References
NOAA: CAMEO Chemicals - Ethylene oxide NIOSH: Pocket Guide to Chemical Hazards - Ethylene oxide Literature References
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Last Updated Date : 09/13/2024