-Carefully selected raw materials.
-High hardness with perfect accuracy.
-T-slots or drilled holes can be made as your request

The main mineral components of granite include pyroxene,plagioclase,a little olivine,biotite and trace magnetite. It is precise in structure with black luster and through hundreds of millons years aging,it is of uniform texture,nice stableness,high intensity and rigidity and can maintain a high precision under heavy weight. So granite is applicable to the works of industrial production and laboratory measurement.The precision of the JINGDA granite surface plates is in line with the standards of advanced countries.Tolerance of planeness:Standard JB/T7975-1999Grade 000 = 1x(1+d/1000)umGrade 00 = 2x(1+d/1000)umGrade 0 = 4x(1+d/1000)umGrade 1 =8x(1+d/1000)um("d" is the diagonal mm,the measuring temperature is normally 20+/-2 degree C)