I am new at cosmetic industry and I am trying to find out a method that I can calculate the period of time after opening (PAO). In Europe, the regulation say that one product which is stable for 30 months have to has a PAO mark. I read a lot of opinions, but nobody say an exact method. I read about AFSSAPS method, but I didn't understand how it works. The EU Regulation say that the PAO must calculated by these parameters: Microbiological Tests, Stability Tests, Packaging, Consumers that is the product for, the usage of product and the ingredients. If anybody more experienced from me can help me, that will be great.
Thank you for a great forum and website generally. It is very helpfull for me!