Time-sensitive chemicals may become hazardous on prolonged or incorrect storage for a variety of reasons e.g., chloroform may produce highly toxic phosgene gas or hydrogen peroxide and concentrated formic acid may generate gas pressure in the bottle. The mechanisms, however, are completely different than organic peroxide formers, and peroxides may not even be involved, but despite the deficiency in the nomenclature, these materials are commonly included in the general class of “peroxide formers”.

Organic Peroxide Formers

Identification, Hazards, Precautions, and Safe Storage

  • Basic information about what an organic peroxide former is, the hazards they pose, how to mitigate the hazard, and how to respond to a potential emergency situation is available here: Organic Peroxide Formers.

Testing and Labeling

Classification and Lists

Other Time-Sensitive Chemicals

Find background information and basic rules on other time-sensitive chemicals (e.g., potassium metal and alloys, alkali metal amides, anhydrous HF/HBr, hydrogen peroxide, concentrated formic acid, and chloroform).