An innovation project has paved the way to BASF’s success in using a conventional stretch blow-molding machine to create the lightest half-liter polystyrene bottle ever: it weighs a mere 7.5 grams. This project gave BASF the opportunity to see how extremely lightweight bottles for dairy products can be made of polystyrene using stretch blow-molding methods. After all, less weight always translates into lower costs and less consumption of resources. Since polystyrene has a lower density than PET, it can be used to produce bottles that weigh less but have the same wall thickness. Owing to the special properties of this plastic, BASF recommends the new polystyrene type (PS BX 3580) specifically for containers used for milk products. This is an approach that will be consistently pursued together with customers.