Polystyrene incorporating graphite has superior insulation properties.
They are also used for non-weight-bearing architectural structures (such as ornamental pillars).
PS foams also show good damping properties; so it is can be used widely in packaging process.
Extruded closed-cell polystyrene foam is sold under the trademark Styrofoam .
This method is frequently used informally in North America for other foamed polystyrene products.