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Hazard Predictions

• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Ethylene oxide reacts with water to form ethylene glycol, which can continue reacting with ethylene oxide to form polymers under some conditions. This reaction is slow at ambient temperature when there are no catalytic impurities in the water; the half-life is 20 days in pure water at 20C. However, the reaction rate is greatly increased with higher temperatures or in the presence of acidic, basic, or metal catalysts (Rebsdat, S. and Mayer, D. 2001. Ethylene Oxide. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).

Water and oxirane reacted in a tank wagon and exploded after several hours. This reaction may have been accelerated by iron oxide (Bretherick, L. 1996. Bretherick's Handbook of Reactive Chemical Hazards. Fifth Ed. Urben, P.G., Ed. Butterworth-Heinemann, Boston, MA. Vol. 1, p 318).