Thaum cov neeg siv khoom yuav tsum xaiv ntawm PP thiab PET pluaj cov ntaub ntawv, lawv yuav tsum xav txog lawv cov kev xav tau tshwj xeeb, lawv cov khoom coj li cas, thiab tus nqi. Rau kev ua haujlwm nruab nrab, PP pluaj yog pheej yig thiab lub teeb, thaum PET straps muaj zog tensile zoo dua thiab yooj, txog tib yam li steel bi