Lab Safety

Organic Peroxides

 What are organic peroxides?

Organic peroxides, or peroxidizable chemicals are materials that undergo a reaction with the oxygen in the air to form peroxides.  These peroxides can decompose or  explode with impact, heat or friction.

 What are some common types of organic peroxides?

  • dialkyl peroxides
  • hydroperoxides
  • diacyl peroxides
  • peroxydicarbonates
  • peroxyesters
  • ketone peroxides
  • peroxyketals
  • alkylperoxy carbonates


What are the different classes of organic peroxides?

Class 1-describes those formulations which are capable of deflagration, but not


Class 2- describes those formulations that burn very rapidly and that present a severe

reactivity hazard.

Class 3-describes those formulations that burn rapidly and that present a moderate

reactivity hazard.

Class 4- describes those formulations that burn in the same manner as ordinary

combustibles and that present a minimal reactivity hazard

Class 5-describes those formulations that burn with less intensity than ordinary

combustibles or do not sustain combustion and that present no reactivity hazard


 How do I properly handle organic peroxides?

  • Always store at the temperature recommended by the manufacturer
  • Never return unused material back to the original container.
  • Only use clean equipment  and work in a clean environment
  • Always wear proper personal protective equipment, such as goggles, lab coat and closed toe shoes
  • Avoid breathing in any dust or mists given off  by the materials

Page last modified December 2, 2010