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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 oxidizing nature of nitrates and nitrites may make mixtures of these materials with acrylates and acrylics problematic; however the exact nature of any interaction and stability are hard to predict. Further, the salts may not exhibit significant solubility in the monomers. Also it is known that certain nitrites actually may inhibit the polymerization of some vinyl monomers. If the inadvertent mixture also contains a reducing agent, that would possibly make the mixture more unstable.

Acrylates and acrylic acids are polymerizable materials and are typically inhibited with low ppm levels of antioxidants (inhibitors) to prevent premature polymerization chain reactions. Many of these inhibitors require dissolved oxygen to be effective. Inhibitor depletion is a function of time and temperature, with higher temperatures increasing depletion rates. These materials are known to be susceptible to destabilization due to low ppm levels of contaminants. Radical generating contaminants such as peroxides and azides are known to initiate monomer polymerization; however, the effects of seemingly benign materials are harder to predict. Therefore, extreme caution should be used in any contamination event. And the material should be presumed to be destabilized until testing and consultation with experts. Uncontrolled polymerization reactions can become adiabatic and lead to a serious runaway reaction with high temperatures and pressures. The general hazards of monomers are discussed in Frurip et al., Process Safety Progress (Vol. 14, No. 2) 1995.

Potential Gas Byproducts

• Carbon Dioxide (CO2)