Are polyurethane and white Styrofoam one and the same? | Garaga

Are polyurethane and white Styrofoam one and the same?


Not quite.


For equivalent thicknesses, polyurethane has a higher thermal insulation factor (R-16 or RSI: 2.8) than expanded or extruded polystyrene (Styrofoam).


In addition, since polyurethane strongly adheres to door surfaces, it provides twice as much resistance to flexion as polystyrene in a comparable door.


Remember, entrance doors are also insulated by injecting polyurethane foam. Polystyrene, for instance, is the material used to make coffee cups for protection in packaging.



               Polyurethane                                                    Styrofoam

Polyurethane insulation                     Polystyrene isulation