We are looking to overhaul our chemical management procedures and I am curious as to the methods used by other laboratories out there in regards to assigning expiration dates for chemicals and materials where the manufacturer does not list an expiration date on the bottle or on the certificate of analysis.
Most of the companies that we purchase chemicals from (I.e. EMD, Avantor and Fisher) state that there is a 5 year shelf life on all of their chemicals when no expiration date is listed on the bottle of certificate of analysis. But for some chemicals, such as high purity solvents and acids, 5 years seems a bit long.
So what is your lab's policy on assigning expiration dates to chemicals which are purchased from an outside manufacturer (not chemicals prepared in the lab)?
Any other thoughts on the topics is welcome!