... and co-extruding expansion boards produced by PVC expansion boards production line have top-grade Free style expansion boards and co- ... materials. PVC expansion boards fit for thermal moulding, heated bending and folded processing. PVC expansion boards can be welded according ... .8, tensile strength, MPa 12-20, bending strength, MPa 12-18, elastic modulus in bending, MPa 800-900, impact strength, KJ ...