Five Hazardous Characteristics:

(4) Reactive Hazard. Includes organic peroxides, unstable reactives, and water reactives as defined under 1910.1200 of Title 29 of the Code of Federal Regulations (CFR).

"Organic Peroxide" means an organic compound that contains the bivalent -O-O- structure and which may be considered to be a structural derivative of hydrogen peroxide.

"Unstable (reactive)" means a chemical which will vigorously polymerize, decompose, condense, or will self-react due to shock, pressure, or temperature.

"Water-reactive" means a chemical that reacts with water to release a flammable gas or a health hazard.