Nhau dzeIndasitiri

PVC, kana kuti polyvinyl chloride, ipolymer inoshandiswa zvakanyanya muthermoplastic inozivikanwa nekushanda kwayo nesimba uye kugara kwenguva refu. Mumakore achangopfuura, nekuda kwekusimbiswa kuri kuwedzera kwekuchengetedzwa kwemoto mumaindasitiri akasiyana-siyana, kudiwa kwezvinhu zvePVC zvinodzivisa moto kwakaramba kuchikura. PVC inodzivirira moto imhando yepamusoro...