Cov roj hmab ntuj muaj qhov siab elasticity ntawm chav sov, me ntsis yas, zoo heev lub tshuab muaj zog, tsis tshua muaj hysteresis poob, hluav taws kub tsawg thaum muaj ntau yam deformation, yog li nws qhov kev hloov pauv kuj yog qhov zoo, thiab vim tias nws tsis yog ncov roj hmab, yog li nws cov hluav taws xob rwb thaiv kev ua haujlwm yog zoo.
Ethylene propylene diene monomer (EPDM) yog cov khoom lag luam ib nrab ntawm cov khoom siv roj hmab, nrog cov laus tiv taus zoo, dej-pov thawj.Mainly siv rau hauv cov khoom lag luam tsis zoo (cov ntsaws ruaj ruaj, roj ntim, O-gaskets, yob tawm, cov kav dej).
Styrene-butadiene roj hmab (SBR), tseem hu ua polystyrene butadiene copolymer. Nws lub cev ua haujlwm ntawm lub cev ua tiav, kev ua tiav zoo thiab kev siv cov khoom lag luam yog ze rau cov roj hmab ntuj. Qee lub zog xws li hnav tsis kam, tiv tshav kub, laus tiv taus thiab vulcanization nrawm zoo dua li cov roj hmab ntuj. Nws tuaj yeem siv nrog cov roj hmab ntuj thiab ntau yam ntawm cov roj hmab hluavtaws. Nws yog dav siv hauv cov log tsheb, txoj siv sia, hoses, xov hlau thiab cable, khoom siv kho mob thiab kev tsim cov khoom siv roj hmab ntau thiab lwm cov teb.
Cov roj hmab sib txuam butadiene yog tsim los ntawm butadiene thiab acrylonitrile los ntawm emulsion polymerization. Nws muaj cov roj ua tau zoo, hnav zoo tsis kam, siab kub tsis kam thiab muaj zog adhesion. Nws cov ntsiab lus tsis zoo yog qhov tsis tshua muaj qhov kub thiab txias tsis zoo, ua rau nws tsis zoo rau nws, kev ua haujlwm hluav taws xob tsis zoo thiab qhov tsis txaus elasticity. NBR tsuas yog siv rau hauv kev tsim cov roj-resistant roj hmab.
Silicone roj hmab yog ib hom hluavtaws roj hmab nrog qhov txias thiab qhov kub thiab txias tsis kam vim nws cov qauv saw dawb. Ntawm txhua hom roj hmab, nws muaj qhov ua haujlwm tau dav tshaj (- 100 ~ 300 C), zoo heev ozone kev laus tiv taus, kev laus tiv tshav kub, tiv taus lub teeb laus, huab cua laus tiv thiab hluav taws xob zoo hluav taws xob.
Fluoroelastomer muaj cov cuab yeej zoo tshaj, xws li kub tsis kam, roj tsis kam, tshuaj lom neeg, lub cev zoo thiab lub cev thiab cov huab cua tsis kam, tiv thaiv hluav taws xob thiab hluav taws xob tsis kam, uas tau thov hauv tsheb thiab kev lag luam tsheb. Vim tias nws zoo heev kub tsis kam, roj tsis kam thiab nruab nrab tsis kam, nws yog tsuas yog siv los ua roj foob thiab O-ntiv nplhaib
