Sell black fused alumina

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black fused alumina, a kind of dark grey colored crystal mainly containing a-AL2O3ad ferrospinel, is made from bauxite smelting in a pouring electric are furnace. It has the characer of high toughness, resistance to high temperature and good thermal stability.
the chimical analysis is : grit nomber is from F8 to F220 , with the AL2O3>=77.00 and Fe2O3<=5.00. the other grit nomber F240-F320 with the Al2o3>=62.00 and Fe2O3<=5.00.
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