Black Granite Surface Plate Optical Breadboard

Black Granite Surface Plate (Qi Nan Qing)

Our granite surface plate refers to the advanced standards of the leading countries, and its flatness tolerance is in accordance with the JB/T 7975-1999 Surface Plate:

Grade 000 =1x(1+d/1000)/μm

Grade  00  =2x(1+d/1000)/μm  

Grade   0    =4x(1+d/1000)/μm  

Grade   1    =8x(1+d/1000)/μm  

(d is the length of the diagonal)

1  High precision  reliable stability resistant to deform and guaranteed accuracy under normal  ambient  temperature.

2  No-rust and anticorrosion.

3  Wear resistance long service life.

4  Any cutting or scraching for working surface does not bring about rough edges which might   influence its  measuring precision.

5  Non magnetization.

6  Glossy surface without sluggishness when the workpieces or tools are moving on it.

• specific gravity 2970-3070 kg/m2
• compressive strength 245-254 MPa
• elastic modulus 1.27-1.47 GPa
• linear expandsibility 4.61X10^-6/oC
• water absorption<0.13%
• shore hardness>70 Hs

• Customized sizes are available