Can PET be used to package milk, yoghurt and similar dairy products?

Yes, if the customer wants this. Dairy products normally have very short shelf lives and are sold and consumed within a few days. Carbon dioxide losses are not relevant and oxygen sensitivity is less important here which allows many other materials to be used which also have good resistance to attack by bacteria. In this application the food manufacturer will use the most appropriate package for his specific product.Milk really needs light (ultraviolet and visible rays) protection to preserve integrity of nutrition and flavour properties, and today there are already many milk bottles based on PET on the shelves, even for those applications requiring longest shelf life (UHT milk).  PET not only meets packaging functional requirements for milk, but has also opened new markets to many milk producers through the excellent consumer acceptance of milk filled in PET bottles.