Which kinds of corundum are divided into? What are the differences between white corundum, brown corundum and black corundum?

There are many types of abrasives, corundum abrasives are often used, corundum is divided into several kinds, today we will understand it together. When it comes to abrades, we will think of white corundum, black corundum and brown corundum, these three kinds of corundum in abrasive and refractory applications are very significant, because each has different characteristics and advantages, so in the use will be very different, so what is the difference before them?
Black corundum use: The difference between white corundum, black corundum and brown corundum

1. Different colors

White corundum: white transparent

Brown corundum: brown black, brown red, magenta

Black corundum: black and metallic

White corundum for use

2, alumina content is different

White corundum: alumina content ≥99.2%

Brown corundum: 94%≤ alumina content ≤75%

Black corundum: 45%≤ alumina content ≤75%

3, the hardness is different

White corundum hardness ≥ Brown corundum hardness ≥ black corundum hardness

Brown corundum for use

4. Different uses

White corundum use: high-end use

Brown corundum use: market volume of large goods

Black corundum use: special use