As we know that the decisive factors in forming the hardness and sharpness of a China flap disc are the abrasive grits and grit sizes. For metal work applications there is a choice of three types, including aluminum oxide, zirconia alumina and ceramic alumina.

1. The aluminum oxide is a good option for smaller jobs and has a low-cost and high efficient advantages. It is the first type of metalwork abrasive for market needs.

2. Zirconia alumina is designed to combine aluminum oxide and zirconia which makes a practical choice for working with mild steel or carbon applications.

3. Ceramic alumina, this type of grit has a grain that is designed to microfracture which means it can stay sharp longer than most other alternatives, and further indicates the cutting time is reduced.

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