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Hazard Predictions

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

Al2O3 can initiate the oligomerization of acetaldehyde to paraldehyde (cyclic trimer) and metaldehyde (cyclic tetramer). At low temperatures (below -30 C), Al2O3 can initiate polymerization to the unstable compound polyacetaldehyde. However, special conditions may be required for this to occur (Eckert, M., Fleischmann, G., Jira, R., Bolt, H. M. and Golka, K. 2006. Acetaldehyde. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).