He pūhui kirihou wera te PP (Polypropylene) e whakamahia whānuitia ana, ā, he mahi nui tana i roto i ngā mīhini hanga wera iti. E whakamārama ana tēnei tuhinga i te whakamāramatanga o te PP, ngā āhuatanga matua, ngā painga matua (te ngāwari o te tukatuka, te ātete ki te wera, te kore paitini, te whai hua o te utu, te āheinga hangarua) mō te hanga hanga wera iti, ngā whakaaro matua mō te whakataurite i te PP ki ngā mīhini hanga wera iti, me te ahunga whanaketanga o ngā taputapu hanga wera iti, hei āwhina i ngā umanga ki te mārama ki ngā rauemi PP me te whakapai ake i te pumau o te hanga me te whakataetae hua.
