For a product of brown corundum, if there are manufacturers, there are three basic products. According to the content of aluminum content, they are called “primary sand”, “secondary sand” and “three-level sand”. In terms of aluminum content and purity, the hardness is reduced in turn. Of course, the quality of these three sands depends on the user. It depends on what the user is doing. Now the first grade sand is widely used in resin ceramic abrasives. Polishing and other aspects, of course, secondary sand is second only to primary sand, widely used in abrasive manufacturing and polishing and sandblasting of various materials, because the price advantage is good in all aspects, of course, according to customers Depending on the actual situation, the third-grade sand can also be used in the manufacture of abrasive tools, such as resin grinding wheels. In the case of sandblasting, it is a little weak (other diamonds are similar to the three-grade sand, and sandblasting is good, hardness and The grain size of the sand is still good. Because the hardness is already weak, the reason is that the aluminum content is reduced. Of course, according to the customer's needs, the three sands have their own advantages and disadvantages. Of course, |