1, detect the alumina content, and the higher the alumina content of white corundum, the better.

2. Test its bulk density. Generally speaking, the higher the bulk density, the higher the alumina content.

3. Check the dust content. Put white corundum powder or massive particles into a container, add water and shake for a period of time, and observe whether there is a layer of white floating near the water (if there is more white corundum powder, it is not foam but paste). The more, the higher the dust content, thus proving its production technology.