Dear Sir,

Happy day?

Sorry for late, we have many problems with grinding balls, so we can not take a decision.

The problem was: after certain period from milling, erosion done on the alumina ceramic ball and we noticed the material be milled have black fog during granulation, this is serious situation, after inspection the balls we find that the surface of the balls have black lines.

Somebody in Chinese company analyzed these balls & compared it with old type we have (good quality type), the result was: contaminated balls is alumina, the second is steatite and mainly silicon dioxide 63% & 4.5% aluminum oxide.

In case you have any idea, Pls feel free to let us know.

Pls consider that the material be milled is urea moulding compound & melamine moulding compound.

Best regards,

Information provided by HuaMing Alumina, China