I-PET strap (i-polyester strap) ifumana amandla ayo kubunzima bemolekyuli yempahla yayo ekrwada, elinganiswa nge-intrinsic viscosity (IV). Uluhlu lwe-IV oluqhelekileyo lwe-PET strap ephezulu yi-0.60 ukuya kwi-0.95 dl / g.
Ukukhetha umtya wePP ofanelekileyo (i-polypropylene strap) ububanzi bubalulekile kukhuseleko lomthwalo, ukuhambelana kwezixhobo, kunye nokusebenza kakuhle kweendleko. Umtya wePP ufumaneka kububanzi obuqhelekileyo ukusuka kwi-5mm ukuya kwi-19mm. Iintambo ezincinci (5-9mm) zihambelana neekhathoni ezikhanyayo kunye ne-e-commerce, ngelixa i-straps ebanzi (12-19mm) ibamba iipallets ezinzima kunye nemithwalo yezoshishino.