"Styrofoam" is a specific trademarked brand name owned by DuPont for Extruded Polystyrene (XPS), whereas "foam board" is a broad general term that encompasses many different materials. Foam boards can include Expanded Polystyrene (EPS), Extruded Polystyrene (XPS), Polyisocyanurate (ISO), or paper-faced foam boards used for arts, crafts, and architectural modeling.
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