Some chemicals have a short life expectancy. Others will remain good for a long time.
Solvents which form peroxides are one example of substances requiring periodic testing. Ethers, vinyl compounds, alcohols, ketones, and aldehydes are some of the peroxide formers.
Your chemical inventory system should provide reminder dates. Bottles should be marked when they are received and when they are opened. In addition, draw a line on the bottle with a china marking pencil or other marker to indicate the full level. This mark will serve as a useful guide to indicate how rapidly the material is being used up and to gauge the remaining amount.
Dr. James A. Kaufman is the founder and president of The Laboratory Safety Institute (LSI) www.labsafety.org – an international, non-profit center for safety in science and science education. LSI provides workshops, seminars, onsite training programs, lab safety program development consultations, facilities inspections and regulatory compliance assistance. Contact LSI with all your lab safety questions: 800-647-1977 or firstname.lastname@example.org.