Date all new containers when opened. Refrigeration does not prevent peroxide formation and, unless the refrigerator used is explosive safe, these materials should not be refrigerated. Be particularly cautious with materials of unknown vintage. Call the Environmental Health and Safety Office when such containers are found. Never distill peroxide-forming solvents unless they are known to be free of peroxides.
Peroxides concentrated in the residue can pose a serious explosive hazard.
In general, these are chemicals the disposal contractor characterizes as either air or water reactive, extremely toxic, or that can readily ignite and Generate excess heat. Because of the disposal expense associated with these compounds, every effort should be made to avoid generating this waste. Order no more than what is needed and use a milder substitute when possible. If the compound has been stabilized, take special care to note this on the container so that the product will not receive reactive pricing and, therefore, will be much cheaper to dispose. Ethers that are old, contain crystal formations, or those containers that are swollen, may be explosive.