Eastern Wire's Expanded Polystyrene (EPS) is fire-resistant and made of a modified expanded polystyrene, which simply melts away when exposed to fire, and does not
contribute to it. When the flame is removed, the fire goes out, unlike traditional Styrofoam products, which continue to burn and act as fuel to a fire.

EPS foam is a closed-cell insulation that is manufactured by "expanding" a polystyrene polymer; the appearance is typically a white foam plastic insulation material (the likes of which can be found as merchandise packaging).