If you have waste of these materials please contact EH&S at 328-6166 for disposal. All containers emptied of "P" Listed materials must be tripled rinsed with a solvent and the rinsed material saved as a hazardous chemical waste. Emptied containers may then be disposed of after removal of labels. Please keep in mind that just because the a chemical is not listed, it may still be an acute hazard waste. Insure that you check the CAS number.