1. Hauv cov roj hmab ntuj, kev sib xyaw ua ke ntawm tus neeg sawv cev ntawm vulcanizing thiab leej faj tuaj yeem tiv thaiv kev thim rov qab ntawm vulcanization, txhim kho kev tiv thaiv tshav kub, txo cov cua sov, tiv thaiv kev laus, thiab txhim kho qhov nplaum ntawm cov roj hmab mus rau txoj hlua thiab cov qauv ntawm cov roj hmab vulcanized. Nws yog tsuas yog siv hauv rubbers xws li lub xub pwg roj hmab thiab tsis txheej ntawm cov log tsheb, uas tuaj yeem daws cov teeb meem ntawm lub xub pwg voids ntawm kev tsis ncaj ncees lub log tsheb. Nws kuj tseem siv tau rau qhov loj-loj thiab tuab cov khoom siv roj hmab thiab ntau yam roj hmab sundries.
2. Cov kab mob ua kom tsis haum tuaj yeem faib ua ob pawg: inorganic thiab organic. Cov kab mob inorganic vulcanizing feem ntau suav nrog cov leej faj, sulfur monochloride, selenium, tellurium, thiab lwm yam. Cov khoom siv roj hmab vulcanizing suav nrog cov khoom tsim uas yog sulfur, selenium, tellurium, sulfur-xyaw tebchaw, peroxides, quinone tebchaw, amine tebchaw, cob txuas, hlau oxides, thiab isocyanates.