Polystyrene foam (PS) also known as Styrofoam, is a solid amorphous material, crystal clear and solid. It is resistant to moisture and water exposure, but decomposes when the material is exposed to UV radiation for a long time. The thermal conductivity is also low.
PS Packaging
Polystyrene is a clear plastic that is particularly popular for transparent packaging. It is characterized by excellent surface properties, good resistance to acids and alkalis (at low concentration), resistance to oils and greases, but also excellent light transmission.