You know it as Styrofoam.

Polystyrene's Versatile Properties Include :

Its Shortcomings:

Its use in our everyday life is quite common and although it poses a serious environmental problem for our future on this planet, its still in use. Restaurants serve their take-out meals in clamshell packaging and nearly everything shipped in a box is molded in polystyrene. We have become dependent on it without thinking about the further effect it may have on the earth.