granite surface plate

Granite Surface Plates


Product specialty is as the following:

1.Made of high quality Natural Black Granite
2.High precision and high stability.
3.No rust and anticorrosion.
4.Non magnetization.
5.Good abrasion resistance.


Physical Property of Natural Black Granite:

1.Specific Gravity:         3.03 g/cm3
2.Shore Hardness:          > 70Hs-80Hs
3.Tensile strength:          211Kg/cm2
4.Compressive Strength:         245-254Mpa
5.Linear Expansion Coefficient: 4.61´10--6/°C
6.Elastic Modulus:                 30-50Gpa
6.Water Absorptivity:           ≤0.13%


Product Application:

Mainly used as detection for an important auxiliary tool in the measurement of the platform;
Important tool to verify difference or tolerance of products against flateness.