Cov roj hmab khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khaus khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khau khiab Qhov zoo ntawm cov roj hmab ntuj yog tias nws yog mos heev, zoo heev elasticity, tuaj yeem hloov mus rau ntau hom kev ua kis las, ua si lub luag haujlwm poob siab, tab sis qhov tsis zoo kuj yog qhov pom tseeb heev uas yog cov roj tsis kam, ozone aging thiab thermal oxygen aging yog pluag. Cov khau ncaws pob hauv tsev feem ntau siv cov roj hmab ntuj.

Pom zoo:

EPDM: S537-3; S537-2; J-2070; J-2080; TER 6235; TER 4548;