Product specialty is as the following:

• Made of high quality Natural Black Granite
• High precision and high stability.
• No rust and anticorrosion.
• Non magnetization.
• Good abrasion resistance.

Physical Property of Natural 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%