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Certain chemicals may form explosive peroxides when exposed to air, or may autopolymerize due to accumulation of peroxides when exposed to air. It is critical to minimize quantities of these materials in the laboratory, and dispose of unused materials before they present an explosion risk. All unopened chemicals should be disposed through Environmental Safety eighteen months after manufacture.
The following chemicals can form explosive levels of peroxides without concentrating. Containers should be dated when opened and disposed through Environmental Safety after three months:
The following chemicals can form explosive peroxides on concentration (e.g., after evaporation). Containers should be dated when opened and disposed through Environmental Safety after twelve months:
The following chemicals may autopolymerize due to peroxide accumulation after exposure to air. Containers of these inhibited chemicals should be dated when opened and disposed through Environmental Safety after twelve months. These reagents are typically produced with inhibitors to prevent dangerous polymerization reactions. If these chemicals are synthesized in the laboratory and are uninhibited, storage is safe for no more than twenty-four hours:
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