1. Brown corundum abrasive, inonyanya kuumbwa neAl2O3, ine kuoma kwepakati, kuoma kukuru, zvimedu zvinopinza uye mutengo wakaderera, uye inokodzera kugadzirisa simbi dzine simba rakakwirira.Ose ari maviri microcrystalline corundum abrasive uye dema corundum abrasive ndizvo zvinobva zvawo.White corundum Whit...
Verenga zvimwe