Aluminum Oxide	99. 0% Min
Alkali metals & Alkali	0. 005 Max
silicate	0. 03 Max
Ignition loss	5% Max
chloride	0. 01% Max
Fe	0. 01% Max
heavy metal（Pb）	0. 5% Max
Water-soluble Matter	0. 5% Max
Sulphate	0. 05% Max