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General Description

  • Synonyms: 1,2-Butene oxide; Ethyloxirane; Butylene Oxide (Stabilized); EBU
  • OSHA IMIS Code Number: E225
  • Chemical Abstracts Service (CAS) Registry Number: 106-88-7
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: EK3675000
  • Chemical Description and Physical Properties:
    • colorless liquid with characteristic odor
    • molecular weight: 72.12
    • vapor pressure: 18.8 kPa @ 20°C
    • molecular formula: C4H8O
    • boiling point: 63.3°C
    • melting point: -130°C
    • flash point: -22°C
  • Incompatibilities: Reacts with strong oxidants causing fire hazard. Vapors mixed with air easily form explosive mixtures

Health Factors

  • Carcinogenic Classification:
  • Potential Symptoms: Eye, skin, respiratory tract irritation; sore throat; cough, shortness of breath, pulmonary edema; nausea; confusion, dizziness, lightheadedness, unconsciousness; blisters. Ingestion Acute: Abdominal pain
  • Health Effects: Irritation-Eyes, Nose, Throat, Skin---Marked (HE14); Nervous System Disturbances (HE7); Explosive, Flammable (HE18)
  • Affected Organs: Eyes, skin, respiratory system, CNS
  • Notes:
    1. OSHA does not have a PEL for 1,2-epoxybutane, but it is an OSHA select carcinogen.
    2. Vapor/air mixtures are explosive.
    3. EPA's inhalation reference concentration (daily inhalation exposure likely to be without an appreciable risk of deleterious effects during a lifetime) is 0.02 mg/m3/day.
    4. Rats exposed 6 hours/day, 4 days/week for 5 months to 2000 ppm 1,2-epoxybutane developed mild ataxia in the hindlegs and showed axonal degeneration in the dorsal portion of the fasciculus gracillis of the spinal cord. This neuropathy, however, has not been reported for human exposure to this chemical.
  • Literature Basis:
    • International Chemical Safety Cards (WHO/IPCS/ILO): Butylene oxide (stabilized).
    • U.S. EPA Integrated Risk Information System: 1,2-Epoxybutane (CASRN 106-88-7).
    • No authors: 1,2-Epoxybutane. IARC Monogr. Eval. Carcinog. Risks Hum. 71(Pt. 2): 629-640, 1999.
    • Ohnishi, A. and Murai, Y.: Polyneuropathy due to ethylene oxide, propylene oxide and butylene oxide. Environ. Res. 60(2): 242-247, 1993.
    • Pohanish, R.P. (editor): 1,2-Butylene Oxide. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 411-412.
  • Date Last Revised: 10/20/2005

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