Roj Hmab yog cov khoom siv polymer uas muaj zog heev nrog thim rov qab deformation.

Nws yog elastic nyob rau hauv tsev kub thiab muaj peev xwm tsim loj deformation nyob rau hauv qhov kev txiav txim ntawm ib tug me me sab nraud quab yuam.Nws tuaj yeem rov qab mus rau nws qhov qub qub tom qab tshem tawm cov quab yuam sab nraud.

Muaj ntau hom roj hmab xws li EPDM, Neoprene Roj Hmab, Viton, Ntuj Roj Hmab, Nitrile Roj Hmab, Butyl Rubber, Timprene, Synthetic Rubber, thiab lwm yam.