Peroxide forming solvents should be purchased in limited quantities. All peroxide forming solvents should be tested prior to distillation.Solvents containing inhibitors should be used whenever possible.Uninhibited monomers should be discarded 24 hours after opening. Inhibited monomers should be tested before use and discarded after 12 months. Group C chemicals consists of monomers which form peroxides that can initiate explosive polymerization.Test these before distillation and discard after 12 months. Group B chemicals form peroxides that are hazardous only on concentration by distillation or evaporation.Test these for peroxide formation before using and discard 3 months after opening. Group A chemicals are those which form explosive levels of peroxides after prolonged storage, especially after exposure to air without concentration.There are three categories of peroxide formers: Examples of inhibitors include BHT (2,6-di-tert-butyl-4-methyl phenol) and Hydroquinone. Most of these solvents are available with inhibitors to slow the peroxide formation. The reaction can be initiated by exposure to air, heat, light, or contaminants. Peroxide Forming SolventsĪutoxidation in common laboratory solvents can lead to unstable and potentially explosive peroxide formation. Researchers should always review the material safety data sheets for information regarding time-sensitive chemicals and expiration dates. It is important to note that the time-sensitive chemicals listed on this webpage are not comprehensive. If any time-sensitive chemicals are found to be past the manufacturer’s expiration date, they must be submitted to REM for hazardous waste disposal immediately. It is extremely important that these chemicals are identified and managed properly. This webpage discusses two classes of time-sensitive hazardous chemicals: peroxide forming solvents and certain compressed gas cylinders. Many chemicals have a shelf-life and can become more hazardous as time goes on.
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