It's really a high-quality and low price material. 1.length: 1800mm,1200mm 2.width:600mm,900mm,1200mm 3.thick:20mm,25mm, Extrusion and expanded polystyrene (XPS) thermal insulation boards Extrusion and expanded polystyrene (XPS) thermal insulation boards are made with polystyrene. Through special process, the hard expended board is extruded, which is an environmental protection material with the ...