- EHS SOP (EHS-0042) is located on the EHS Website (http://ehs.mit.edu/site/sops)
- Includes many common solvents and reagents which are known to form organic peroxides on exposure to air (THF, Ethers, IPA, Dioxanes, Styrene, 2-Hexanol, etc)
- Highly flammable, low-power explosives that are very sensitive to shock, sparks, elevated temperatures, light, strong oxidizing and reducing agents, and friction, such as a cap being twisted open
- Distillation, evaporation or other concentration of some peroxide-forming chemicals can present a high risk of explosion.
- May be inhibited or uninhibited. (this will likely be indicated on the chemical container)
- Inhibition slows but does not eliminate peroxide formation
- BHT, hydroquinone and diphenyl amine are inhibitors used
- EHS SOP includes key dates for safe usage of chemical & allowable peroxide levels for waste disposal (i.e. </=20ppm)
- Read MIT EHS SOP on Peroxide Forming Chemicals.
- Determine amount you need and check inventory before ordering.
- Order only what you need. They have a short shelf life.
- Determine if inhibited chemicals can be used.
Upon receiving chemical:
- Check for manufacturer’s expiration date & inhibitor info on the container
- Put received date on container.
- Add information to inventory.
- Store away from light, in flammable storage cabinet, flammable storage refrigerator, or other appropriate location/container.
- Indicate at storage location presence of peroxide formers. (best practice)
Use or Dispose of openproduct (without testing) by manufacturer’s expiration date or based on receive date, if reached first, as indicated below:
- w/in 24 hours for un-inhibited chemicals in Group C (SOP)
- w/in 1 year for inhibited chemicals in Group C (SOP)
- w/in 3 months for chemicals in Group A (SOP)
- w/in 1 year for all chemicals in Group B & D (SOP)
- w/in 5 years for 2-Propanol / Isopropanol (IPA)
Use or Dispose of unopenedproduct (without testing):
- by manufacturer’s expiration date, OR
- w/in 12 months of receive date forall chemicals in SOP if reached first
Test containers for peroxides if they are beyond the recommended dates or if no dates are indicated on bottles in inventory.
- Examine bottle. If solids or crystals have formed do not attempt to test! Contact EHS!
- No need to test waste streams prior to disposal request, provided the concentration is <25%, by volume, of total waste stream (not IPA streams)
- Peroxide test strips available from JT Baker (4416-01) through VWR
- Examine bottle carefully for possible crystals or particles in bottle or around the cap
- Lab should test containers before use if expiration dates have been received or containers are no longer wanted & if waste stream is >25%, by volume, concentration of a peroxide forming chemical (not applicable to IPA waste streams)
- If </= 20 ppm, place red tag on container, indicate peroxide levels, and request disposal or bring to MAA
- If > 20 ppm, contact EHS
- If at any time a researcher does NOT feel comfortable testing the container they should not attempt this and should contact EHS for assistance.