Following special storage requirements can increase the shelf life of chemicals. When chemicals are received, date and store them in a manner that enables the older chemicals to be used first. This will develop a rotational system so that chemicals will be used before shelf life expires. Replace worn labels in a permanent, legible fashion. This will prevent an unknown chemical from being generated.
Unknown chemicals are difficult and expensive to manage as a waste.
Label all containers and reaction flasks that contain or will contain chemicals. DO NOT use abbreviations, trade names or chemical symbols. This will prevent an unknown chemical from being generated. Replace faulty or damaged caps and lids. This will safeguard against the effect of air and moisture contamination.