The physical properties: Specific Gravity:2970-3070kg/m3
Compressive strength:245-254N/m m2
Water absorption:<0.13%
Elastic Modulus:1.27-1.47N/m m2
Shore hardness:> Hs70
Linear Expansion Coefficient:4.61 × 10-6/ °C
Precision has 0, 1, grade. It is the ideal tool for drawing line and inspection at precision processing company.
Product Speciality:
1. Made of high quality Jinan Black Granite
2. High precision and high stability.
3. No rust and anticorrosion.
4. Non magnetization.
5. Good abrasion resistance.
Usage: Inspecting the coaxality cylindricity symmetry and shifting of revolution parts
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