PET pluaj (polyester pluaj) muab nws lub zog los ntawm qhov hnyav molecular ntawm nws cov khoom siv raw, uas yog ntsuas los ntawm cov viscosity intrinsic (IV). Qhov feem ntau IV rau qhov zoo PET pluaj yog 0.60 txog 0.95 dl / g.
Xaiv txoj cai PP pluaj (polypropylene pluaj) qhov dav yog qhov tseem ceeb rau kev ruaj ntseg thauj khoom, khoom siv sib xws, thiab kev siv nyiaj txiag. PP pluaj muaj nyob rau hauv cov qauv dav ntawm 5mm txog 19mm. Cov hlua me me (5-9mm) haum lub teeb thawv thiab e-lag luam, thaum cov hlua dav (12-19mm) tuav cov pallets hnyav thiab cov khoom lag luam.