Polystyrene (PS)
![Polystyrene (PS)](https://cdn.prod.website-files.com/6478bda853b1ce226d27f16a/64f8680bfd871e36b24415cd_DSC_9522.jpeg)
PS is used in packaging for make-up, lipstick, compact powder, blush, eyeshadow and covers.
Source: Cosmetic Formulation Principles and Practice - Heather A.E. Benson, Michael S. Roberts, Vânia Rodrigues Leite-Silva, Kenneth A. Walters