Ma tfehmeḍ s tebɣurat n PET n uɣef n tmeɣlin n tmeddurt n wass-a, D ayen yesɛan ad tfehmeɣ s tmeddurt n ufarien n sseqdaceḍ s zdogma. Yiwen n ufar-a ay d-yettaɣen d ameqran deg wamlalen n tegḍar n PET (Polyethylen Terefthalat). Amagrad-a yessedd-d tameddurt n tmeddurt n tebɣurat n uɣur n PET, yessemmta-nsent.