1. Brown corundum abrasive, te nuinga tito o Al2O3, he reo pakeke, pakeke nui, matūriki koi me te utu iti, a he pai mo te tukatuka konganuku ki te kaha tensile tiketike.Ko te microcrystalline corundum abrasive me te pango corundum abrasive ko ona hua.White corundum Whiti...
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