1. Brown corundum abrasive, ka mea nui i haku ʻia me Al2O3, he ʻano paʻakikī, ʻoʻoleʻa nui, nā ʻāpana ʻoi a me ke kumu kūʻai haʻahaʻa, a kūpono no ka hana ʻana i nā metala me ka ikaika tensile kiʻekiʻe.ʻO ka microcrystalline corundum abrasive a me ka ʻeleʻele corundum abrasive nā mea i loaʻa mai.Keʻokeʻo corundum Whit...
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