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Granite Guideways
Granite rail is used in CMM, drilling& milling machines for PC board,Laser machines and CNC as a guideway with Grade00 of DIN876/GB/JIS .
Physical Property of Jinan Black Granite:
Specific Gravity: 3.03 g/cm3
Shore Hardness: > 70Hs-80Hs
Tensile strength: 211Kg/cm2
Compressive Strength: 245-254Mpa
Linear Expansion Coefficient: 4.61´10--6/°C
Elastic Modulus: 30-50Gpa
Water Absorptivity: ≤0.13%