The process of sterilization is among the most complex ones when dealing with plastic materials. Plastic materials cannot be sterilized with high temperature because they would be permanently physically deformed. The containers are sterilized with ionizing radiation (y radiation) or with gas and moisture (gas sterilization). Products which are packed for sterilization are packed in multilayer packaging in order to meet costumer´s requirements (standards) for proper upgrade of products from lower to higher level of purity. Every batch of sterilized products is accompanied by an adequate sterilization documentation. The efficiency of every sterilization process is checked by an adequate biological indicator.