関連ワード:  is polystyrene flammable    is polystyrene flammable in uk    is styrofoam flammable    is styrofoam flammable in microwave    is polystyrene combustible    is polystyrene insulation flammable    is expanded polystyrene flammable    is polystyrene foam flammable    is extruded polystyrene flammable    is polystyrene cladding flammable