Qinisekisa ukuthi usho okuthathu, kufanele kube: I-PPR, i-PVC, i-PE 1. Amapayipi epulasitiki asetshenziswa kakhulu: I-PPR (i-polypropylene), i-PVC (i-polyvinyl chloride), i-PB (i-polybutene), i-PE-RT (i-polyethylene engashisi), i-PE (i-polyethylene) \HDPE (i-polyethylene eqinisiwe ephezulu) i-ethylene), njll. Okwesibili, ubukhulu bepayipi lepulasitiki...
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