Co-extrusion board ndiukadaulo watsopano.Mosiyana ndi bolodi lina la thovu, pali zigawo ziwiri za kutumphuka kumbali zonse za co-extruded thovu board.
Iwo amakhala ndi yosalala pamwamba kwambiri ndipo ndi mkulu khalidwe PVC thovu bolodi.Mtengowu ndiwokweranso 5% kuposa mitundu ina ya nkhumba zamtundu wa PVC