Cov nres nres sib txawv raws li txoj kev sib tsoo tuaj yeem muab faib ua ob hom: nruas nres thiab disc nres pads. Raws li cov ntaub ntawv sib txawv, cov nres nres feem ntau tuaj yeem faib ua hom asbestos, hom semi-hlau thiab NAO hom (ie no. Asbestos organic type) nres nres thiab lwm yam peb.
Nrog rau txoj kev loj hlob sai ntawm cov cuab yeej siv niaj hnub no, zoo li cov khoom siv ntawm lwm lub tshuab nres, cov nres nres lawv tus kheej tau tsim kho thiab hloov pauv nyob rau xyoo tas los no.
Nyob rau hauv cov txheej txheem tsim khoom, cov khoom siv sib txhuam siv rau ntawm lub ncoo nres yog qhov sib xyaw ntawm ntau cov ntaub ntawv los yog cov khoom siv ntxiv, thiab cov fibers tau ntxiv rau qhov no kom muaj zog thiab muab kev txhawb zog. Nres pad manufacturers feem ntau nruj-lipped txog kev siv cov ntaub ntawv, tshwj xeeb tshaj yog cov formulations tshiab. Tau kawg, qee cov khoom xyaw xws li mica, silica, roj hmab fragments yog pej xeem. Qhov kawg tshwm sim ntawm nres nres braking, hnav tsis kam, kub tsis kam thiab lwm yam khoom yuav nyob ntawm seb tus txheeb ze proportions ntawm cov khoom sib txawv. Ntawm no yog ib tug ceev tham txog ntau yam sib txawv ntawm lub nres pads.
