... c.ISO9001:2000 Quality System CertificateHDF/MDF is made of post-industrial wood products, including recycled wood chiops, saw dust and ... is made by more that 20 working procedures. 2.Imported PVC skins can prevent the door from firing, ironing, diacoloring ... skeleton structure inside, both outsides with HDF panels, coating PVC skins(film). HDF panel thickness3-8 mmDoor leaf thickness40-45 ...