Insimbi yethusi, eyaziwa nangokuthi isihlabathi se-copper slag noma isithando somlilo se-copper, i-slag ekhiqizwa ngemva kokuncibilikiswa kwensimbi yethusi futhi kukhishwe, eyaziwa nangokuthi i-slag encibilikisiwe. I-slag icutshungulwa ngokuchotshozwa nokuhlolwa ngokuya ngokusetshenziswa okuhlukile nezidingo, futhi imininingwane ivezwa ngenombolo ye-mesh noma ubukhulu bezinhlayiya. Insimbi yethusi inokuqina okuphezulu, ukuma ngedayimane, okuqukethwe okuphansi kwe-chloride ion, uthuli oluncane ngesikhathi se-sandblasting, akukho ukungcoliswa kwemvelo, ukuthuthukisa izimo zokusebenza zabasebenzi be-sandblasting, umphumela wokukhipha ukugqwala ungcono kunesinye isihlabathi sokususwa kokugqwala, ngoba singasetshenziswa kabusha, izinzuzo zezomnotho nazo zinkulu kakhulu, iminyaka eyi-10, imboni yokulungisa, indawo yemikhumbi kanye namaphrojekthi amakhulu esakhiwo sensimbi zisebenzisa insimbi yethusi njengokususwa kokugqwala.
Lapho umdwebo wesifutho osheshayo futhi ophumelelayo udingeka, i-copper slag iyisinqumo esihle. Kuye ngebanga, ikhiqiza i-etching esindayo ukuya emaphakathi futhi ishiya ubuso bumbozwe nge-primer nopende. I-Copper slag iyindawo esebenzisekayo ye-silica esikhundleni sesihlabathi se-quartz.