In addition, the mask does not have any expiration date, shelf life, a piece of cloth, you tell me how long the period of validity, the main is the sterilization period of validity, generally two years. In fact, the two-year period of validity, but also the state mandatory, the original equipment products do not have a validity period, and then added to the strict regulation, including the equipment what are written a validity period, it is not funny.
So rest assured that the band, above the 13485, and ISO certification, not a big problem.
Originally, I've worked for a pharmaceutical company.