Amatafari maremare - alumina ni ubwoko bwibikoresho bivunika cyane bigizwe na oxyde ya aluminium (Al₂O₃).
Bricks with an Al₂O₃ content exceeding 90% are classified as corundum bricks. Standards vary by country due to differences in available resources; for instance, European standards set the minimum Al₂O₃ content for high-alumina refractories at 42%. In China, high-alumina bricks are typically categorized into three grades based on Al₂O₃ content: Grade I (>75%), Icyiciro cya II (60-75%), n'icyiciro cya III (48-60%).
Ibi nibicuruzwa bya aluminiyose hamwe na aluminium oxyde (Al₂O₃) irenga 48%.
Nubwoko bwibintu bitagira aho bibogamiye bifite alumina irenga 48%, bikozwe no gushushanya no kubara bauxite cyangwa ibindi bikoresho fatizo bikungahaye kuri alumina. Bagaragaza ubushyuhe buhanitse hamwe nubushyuhe burenze dogere 1770. Hamwe no kurwanya icyuma cyiza, bikoreshwa mugutondekanya itanura ryibyuma byamashanyarazi, itanura ryo gushonga ibirahure, hamwe nitanura rya sima.
Hejuru - umutwaro - koroshya, hasi - kunyerera hejuru - amatafari ya alumina [1] ni ibikoresho byo guhanagura bihebuje bikozwe cyane cyane muri bauxite idasanzwe -, korundum, hamwe na mullite. Aya matafari atanga ibyiza nkubushyuhe buke - hejuru yubushyuhe, kurwanya isuri ikomeye, hamwe nubushyuhe bwiza bwumuriro.
Bikwiranye n’amashyiga manini kandi aringaniye - nini, byerekana intambwe ishimishije iganisha ku musaruro w’imbere mu gihugu wo mu rwego rwo hejuru -, ibikoresho byo mu rwego rwo hejuru - byoherejwe mu mahanga mbere y’igihugu cyanjye gishya -; iki gicuruzwa cyashyizwe muri "Gahunda ya Spark."