Yas yog ib qho khoom siv polymer, ntau hom, qhov zoo yog:
(1) cov khoom siv dag zog zoo, lub cev nyhav, yooj yim cia thiab tsheb thauj mus los, yooj yim nqa;
(2) permeability, sealing zoo, zoo siab;
(3) Kev ua tiav kev ua haujlwm, tuaj yeem ua rau ntau lub fwj, cov tshuaj, cov yeeb yaj kiab, cov hnab thiab cov ntaub ntim khoom sib txuam;
(4) Hnav cov xim thiab kev luam ntawv. Cov ntawv qhia txog tshuaj, kev qhia, kos npe, bar code tuaj yeem inkjet ncaj nraim lossis luam tawm ntawm cov khoom yas, thiab yuav tsis poob;
(5) kev ruaj ntseg zoo, tsis muaj tshuaj lom, kev noj qab haus huv thiab kev nyab xeeb. Cov tshuaj tua kab mob tuaj yeem ua tau los ntawm kev tuav pov hwm los npog npog, nrog rau cov ntawv sau cuav thiab lwm yam.