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Good porous ceramic vacuum chucks are recognized by many engineers and designers as having the following characteristics:
1. High precision flatness,
2. The smaller the pore size, the better
3. The lighter the weight, the better
4. The thicker the thickness of the porous ceramic, the better
5. Only need the porous ceramic material with high precision flatness can be used
6. Multiple smaller vacuum chucks can be combined into a larger one to reduce costs

But the disadvantages of porous ceramics for vacuum chucks must be evaluated
1. The smaller the pore size, the easier it is to block
2. The thicker the thickness, the worse the ventilation effect.
3. Blocking will occur after grinding
4. Adsorption of soft materials is best

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