Our company uses acetone and isopropanol in our manufacturing process to clean our product. Our operators get the chemicals from a large container and put it into small containers like this (http://www.soscleanroom.com/product/facilities/8-oz-esd-safe-solvent-dispenser-standard-pump/?gclid=CILep_rTzc0CFdBZhgodSWsEiA) to keep at their station.
Some times our operators say that it was more difficult to clean the product today and equate that to mean the chemicals were weaker that day. Recently our operators stated that the chemicals seemed weak again but the next day they used the same chemicals and said they were fine now. This leads me to believe that the chemicals are fine and that there is a different problem leading to harder cleaning.
How fast does acetone or isopropanol absorb water from the air? How long will it take for the chemicals to be noticeably weaker if stored in the containers mentioned above? Should we be dumping the chemicals everyday or would weekly dumping be fine?
The temperature and humidity is relatively constant at our factory.