Polystyrene. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/POLYSTYRENE
A brittle synthetic polymer composed of repeated styrene units. Polystyrene is transparent and rigid because the benzene rings in each styrene unit prevent the polystyrene chains from arranging themselves into a tight crystalline structure. Polystyrene has a wide variety of uses, especially as a solid foam for insulation and packaging.
It's lighter in weight because it's made of things like expanded polystyrene or styrofoam.
Along with the health risks associated with the manufacture of products that use polystyrene, The National Bureau of Standards Center for Fire Research noted 57 chemical by-products released during the creation of Styrofoam.
Styrofoam has become such an accepted everyday product, that people often don't stop to realize that it is made from polystyrene which is a petroleum-based plastic.
Foam cushions for sofas can be made out of polyurethane, polystyrene, open-cell or closed-cell foam, and slow recovery foam (also known as "memory foam").
Biodegradable caskets are fashioned from mostly recycled, earth-friendly materials, while other caskets are made of wood or polystyrene plastic.