Brown corundum abrasive, tumadi esịnede Al2O3, nwere ọkara ekweghị ekwe, nnukwu siri ike, nkọ ahụ, ọnụ ala, na dabara maka nhazi ọla na elu tensile ike. Microcrystalline corundum abrasive na black corundum abrasive bụ ihe nrụpụta ha.
Oge nzipu: Mar-01-2023