Ogula nthawi zonse amasankha lamba la polyester PET chifukwa limapereka mphamvu zosayerekezeka, chitetezo, komanso kutsika mtengo kwa ntchito zonyamula katundu wolemetsa. Zomangira zokomera zachilengedwe izi, zomwe zimadziwika kuti zingwe zachitsulo zapulasitiki, zimapereka mphamvu zolimba kwambiri kuyambira 160-1360 kg.