The granite surface plates are high accuracy and easy maintenance, for the following reasons:

1. Uniformity in Hardness
2. Easy To Clean
3. Wear resistance
4. Anticorrosion
5. Accurate Under Load Conditions
6. Non-magnetic
7. Thermal Stability
8. Low Porosity
9. Low maintenance cost

The disadvantages are not withstanding impact and beating, high humidity brings about granite deformation, and the hygroscopicity is 1%.