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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

The combination of hemiacetals and hemiketals (containing alcohol groups) with isocyanates or thioisocyanates may result in vigorous reaction similar to those noted below:

Reactions of isocyanates, including 1,6-diisocyanatohexane, with alcohols can be violent (National Fire Protection Association. 1975. Publication 491M. pp. 19).

Polyhydric alcohols and polyisocyanates polymerize very readily due to the ease of addition reactions at the isocyanate group. Much heat can be evolved. Monohydric alcohols form carbamates with isocyanates with some evolution of heat (Rich, G. A., 1993, Dangerous Chemical Reactions, Gulf Publishing Co., Houston, TX, p. 255).