Rii daju lati sọ mẹta, o yẹ ki o jẹ: PPR, PVC, PE 1. Awọn paipu ṣiṣu ti o wọpọ ni: PPR (polypropylene), PVC (polyvinyl chloride), PB (polybutene), PE-RT (polyethylene ti o ni ooru), PE (polyethylene) \ HDPE (ti a fi agbara mu polyethylene giga-iwuwo) ethylene), bbl Keji, iwọn paipu ṣiṣu ...
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