Kev ntsuas hardness tuaj yeem ua rau roj hmab, yas, thiab cov tshuaj zoo rau lawv cov khoom physicochemical. Tshwj xeeb, cov cheeb tsam xeem sib txawv nyob ntawm cov khoom siv, tab sis tuaj yeem faib ua raws li hauv qab no:
Plastics kuaj thaj chaw muaj xws li: Resin raw khoom, yas films, yas kav, yas tsev cov ntaub ntawv, yas ntim, yas casings, yas cov khoom ua si, hlau thiab cable sheathing thiab rwb thaiv tsev, thiab yas profiles.
Cov chaw kuaj roj hmab muaj xws li: roj hmab nyoos, log tsheb, fenders, sealing rings, hoses, xaim thiab cable sheathing thiab rwb thaiv tsev, roj hmab cov khoom ua si, conveyor siv, thiab ceev- txav cov khoom siv.
Cov chaw kuaj tshuaj zoo muaj xws li: Txheej, cov nplaum, cov khoom siv hlau, thiab ntau yam tshuaj ntxuav.
