The accordion list below identifies common peroxide forming chemicals and groups them by hazard class. This list should be used as a screening tool when reviewing laboratory inventories, evaluating chemical storage conditions, or determining whether additional testing or disposal may be needed.

Because peroxide hazards vary by chemical, concentration, storage age, inhibitor status, and use conditions, laboratories should not rely on the list alone to determine safety. Review the supporting peroxide forming chemical safety resources above and contact Environmental Health & Safety for assistance before handling any questionable, expired, damaged, crystallized, or potentially unstable container.

Important Handling Practices:
All peroxidizable chemicals and other materials that may become unstable over time must be clearly dated upon receipt and upon opening. These chemicals should be tested regularly for peroxide formation in accordance with the manufacturer’s instructions or institutional guidelines. Chemicals must be disposed of within 12 months of receipt or by the manufacturer’s expiration date, whichever comes first. Any chemical that tests positive for peroxide formation or exceeds recommended storage duration should be promptly disposed of through Environmental Health & Safety (EHS) procedures.