GEMSTONE is a multinational group company dedicated to technical research and production of advanced materials. We have 4 manufacture bases in mainland of China and a wide variety of alumina products are developed such as microcrystal grinding medias(balls and linings), high purity alumina packings, ceramic comb items, etc.
Our alumina products stand out in service because of high crush strength, high hardness, premium performance in wear resistance and erosion control.
It is worth mentioning...
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