Mitundu ya mankhwala a PVC polyvinyl chloride imagawidwa mu PVC-SG3, PVC-SG5, PVC-SG8. Mitundu yosiyanasiyana ya mankhwala imakhala ndi ntchito zosiyanasiyana. Gulu lachitsanzo lomwe limagwiritsidwa ntchito ndi: SG-3 ndi makanema, mapaipi, zikopa, zingwe zamawaya ndi zinthu zina zofewa. SG-5 ndi ya...