When Storing Organic Peroxide

  • Store organic peroxides separately from processing and handling areas and keep them away from incompatible materials such as strong acids and bases, other oxidizing materials, flammable or combustible liquids and materials that can be oxidized.
  • Consideration needs to be given to the location of the store in terms of separation distance from occupied buildings, boundaries, process units, flammable liquid storage tank, sources of ignition, public roads, railways, waterways, etc. You should consult with your local authority, insurance company and fire brigade prior to any construction/ placing of a store as they may have insight/opinions that affect your decision.
  • Ensure the store is constructed from materials that are compatible with organic peroxide and that it’s earthed and the exterior painted a light colour to help reflect sunlight and reduce heat build-up.
  • For ventilation a standard of at least five air changes per hour is recommended, with vents in at least one, and preferably more, external walls. To provide this, these openings should normally have a total area of at least 2.5% of the total area of the walls and roof and should be at high and low level. The store should also be fitted with a pressure relief system (preferably in the roof so it vents upwards) and have a fire rating of 1 hour as a minimum.
  • The internal temperature of the store mustn’t exceed the temperature range of the organic peroxide and any temperature control systems installed must be compatible with the material stored and the zoning of the area.
  • Internal surfaces need to be resistant to penetration by the organic peroxides and floors should have no cracks in which spilled chemicals could lodge. Since liquid organic peroxides flow easily you must have a containment system in place; such as built- in sumps and or sills and ramps at door openings. Smaller amounts should be stored in trays made from compatible materials to contain spills and leaks. Try to store containers away from doors as they could cut off an escape route if an emergency occurs.
  • Follow the chemical supplier’s/manufacturer’s recommendations for maximum and minimum temperatures for storage and use as it can be hazardous to allow the temperature to exceed the maximum or fall below the minimum recommended temperatures, and with that in mind you will need monitoring/alarm systems to provide adequate warning in the event of an incident.
  • Higher temperatures can be hazardous since they speed up the decomposition rate of organic peroxides; some organic peroxides need to be kept at low temperatures. Always check the zoning of the area and use the appropriate electric devices.
  • Open and dispense from containers of organic peroxides in a designated area away from the storage area and don’t allow any ignition sources in the vicinity. Take care that the organic peroxides don’t come into contact with combustible or other incompatible materials when they are being dispensed and use dispensing equipment such as drum pumps that the chemical supplier/manufacturer has recommended. These items must be made from non-sparking materials compatible with the peroxides used. Decontaminate after use and keep them clean to avoid contamination.


  • When organic peroxides are being transferred from one container to another avoid spills or the product to coming into contact with your skin or clothing. Never transfer liquids by pressurizing their usual shipping containers with air or inert gas as the pressure may damage them. Moreover, if air is used, it may create a flammable atmosphere inside the container.
  • Glass containers with screw-cap lids or glass stoppers may not be acceptable for some organic peroxides, especially those sensitive to friction and grinding.
  • Never transfer materials stored in a vented container into a tightly sealed, non-vented container as the build-up of gas pressure could rupture it. Dispense from only one container at a time and finish all the dispensing of one material before starting to dispense another.
  • Dispense the smallest amount possible, preferably only enough for immediate use and keep containers closed after dispensing to reduce the risk of contaminating their contents.
  • Never return unused material, even if it does not seem to be contaminated, to the original container.
  • If a water-based formulation freezes, do not chip or grind it to break up lumps of material, or heat it to thaw it out. Follow the chemical supplier/manufacturer’s advice.
  • Avoid dropping, sliding or skidding metal containers such as drums or barrels which contain friction or shock sensitive material.
organic peroxide storage