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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Polymerization of acetaldehyde is catalyzed by iron and other metals (Sorbe. 1968. Giftige und Explosive Substanzen, Frankfurt, Umschau Verlag, pp. 97; Lewis, R.J., Sr. 1992. Sax's Dangerous Properties of Industrial Materials, 8th Edition. New York: Van Nostrand Reinhold. pp. 5).

Acetaldehyde should not be stored in unlined vessels constructed from magnesium or alloys containing magnesium. It is likely a polymerization hazard (Fleischmann, G., R. Jira. 2002. Acetaldehyde. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)).

Formaldehyde is easily polymerized upon contact with iron, nickel, zinc, or alloys thereof, except for stainless steel, which is safe (Reuss, G., W. Disteldorf, A.O. Gamer, and A. Hilt. 2002. Formaldehyde. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)).

Zinc-mercury amalgam can reduce aldehydes to flammable alkanes (Kammermeier, B. 2000. Reduction. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).

Aldehydes and ketones can undergo one-electron reductions with magnesium and couple to form pinacols. Reactive radical intermediates are formed in this reaction (Kammermeier, B. 2000. Reduction. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).

Potential Gas Byproducts

• Hydrocarbons