Deep bed molten aluminum or steel filtration.
Spherical balls of alpha-alumina (corundum) is produced by sintering ball-formed calcined alumina at a temperature just under the 3704°F (2040°C) fusion point of aluminum oxide. These tabular alumina balls are then crushed, graded or screened, and ground to a wide range of granule. The powder size must be controlled in good condition, meanwhile adding special film formation additive . Otherwise, the corundum gravel can not absorb the particle from liquid metal。 There are four kinds of filtration media: . 1XXX，3XXX，8XXX；2XXX，7XXX；5XXX，6XXX；High purity aluminium. The Film formation additive is different.
Inert to molten aluminum Dust Free。 Does not leach soda upon immersion in molten aluminum Sphere or ball shape should be uniform.
Good resistance to thermal and mechanical shock; Excellent abrasion resistance
White crystalline gravel or ball. Depending on requirements, ball sizes are produced from 1/8 to 2 inch (tolerance ± 6% mm); Gravel size: 1-18mm
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