1. high precision reliable stability resistance to deform and guaranteed accuracy under normal ambient temperature.
2. No-rust and anticorrosion
3. wear resistance long service life
4. any working surface cutting or scratching dose not bring about rough “edges”which might influence its measuring presicion.
5. nonmagnetization.
6. gloosy surface without sluggishness when the workplaces or tools are moving on it
7. It may chip, but will not develop a burr. It is easy to keep clean.
physical properties of “JiNan Black ”
Specific granvity:2970-3070kg/m^3
Compression strength :245-254N/mm^2
Elastic modulus:1.27-1.47 N/mm^2
Linear expansion coefficient:0.0000461%(4.61*10^-6)
Water absorbtivity<0.13%
Shore hardness :above Hs 70
The precision of the Square granite surface plates is in line with the standards of advanced countries. Tolerance of planeness: Standard JB/T7975-1999 Grade 000 = 1 × ( 1+d/1000 ) μm Grade 00 = 2 × ( 1+d/1000 ) μm Grade 0 = 4 × ( 1+d/1000 ) μm Grade 1 = 8 × ( 1+d/1000 ) μm ( "d" is the diagonal mm ) (The measuring temperature is normally 20±2°C )
granit pedestal