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im looking for a horizontal light weight top for a shelf layout. i went to home depot, all they have is owens-corning FOAMULAR in 2'x8 pink sheets. i called the mfr. they said that this is NOT EXTRUDED STYROFOAM, it is EXPANDED POLYSTYRENE. apparently the plastics industry salesmen use these inaccurate terms interchangably because the components change almost daily, and they can't keep up. im about to try Lowe's. they list a styrofoam panel made by georgia-pacific, and they seem to stock only 4x8's. but i will get back to you on that. i hope it's actually 'extruded. ' the expanded polystyrene may be good for vertical scenery, but i read that extruded styrofoam is the only way to go.also, if you check the net, urethanes , polystyrenes and styrofoams can all be mixed up in the same 'vat' in different configurations, to produce something that LOOKS like a 'pure' extruded 'styrofoam'. caveat emptor....
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