1. I-brown corundum abrasive, ikakhulukazi eyakhiwe i-Al2O3, inobulukhuni obuphakathi, ukuqina okukhulu, izinhlayiya ezibukhali kanye nenani eliphansi, futhi ifanele ukucubungula izinsimbi ezinamandla aphezulu aqinile.Kokubili i-microcrystalline corundum abrasive kanye ne-black corundum abrasive yizinto eziphuma kuyo.I-White corundum Whit...
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