Classification and granularity of brown corundum products

We all know that there are grades in brown corundum products, and as abrasives, there are also different grain sizes. This knowledge is useful for us to know what kind of brown corundum products we choose, so we should master the contents of the knowledge.
Take the grade of brown corundum as an example. Generally, those with a content of more than 90 can be classified as Grade 1 brown corundum; The content of more than 80% is secondary brown corundum; However, the third-grade brown corundum will not be distinguished by its content, as long as its hardness can be identified by other factors.
In terms of the grain size of brown corundum abrasive, the grain size of general products is 6 # - 240 #, but in order to meet the needs of more users, there have been 800 # brown corundum products. In such a large range, 150 # is one of the most widely used, and some of the properties of this brown corundum product are relatively ideal.