Description
Main material composition of granite are picrite, plagoclas, a little olivine, biotite and atom magnetite. It is black and has precision structure. It has uniform texture, good stability, big intension, high hardness and high precision under heavy duty through millions of years aging. It is suitable for the measuring work of industrial production and laboratory.
Physical properties
Density : 2970 – 3070kgf/m3
Compressive strength : 245-254N/mm2
Flexible grinding amount : 1.27-1.47N/mm2
Coefficient of linear expansion : 4.61 x 10-6/˚C
Water Absorption : <0.13%
Shore hardness : Over Hs70
Flatness Tolerance
The precision of granite surface plate refers to the standard of developed country. The flatness tolerance should accord with the standard of JB/T7975-1999.
Grade 000 = 1 x ( 1+d/1000)µm
Grade 00 = 2 x ( 1+d/1000)µm
Grade 0 = 4 x ( 1+d/1000)µm
Grade 1 = 8 x ( 1+d/1000)µm
| Model | Available Size (Length x Width x Thickness) | Total Height (Included Granite + Stand) |
| GN400x400x100T | 400 x 400 x 100 mm | 855 – 875 mm |
| GN450x450x100T | 450 x 450 x 100 mm | 855 – 875 mm |
| GN500X400X100T | 500 x 400 x 100 mm | 855 – 875 mm |
| GN600X600X100T | 600 x 600 x 100 mm | 855 – 875 mm |
| GN630X400X100T | 630 x 400 x 100 mm | 855 – 875 mm |
| GN800X600X100T | 800 x 600 x 100 mm | 855 – 875 mm |
| GN900X600X100T | 900 x 600 x 100 mm | 855 – 875 mm |
| GN1000X750X150T | 1000 x 750 x 150 mm | 855 – 875 mm |
| GN1000X1000X150T | 1000 x 1000 x 150 mm | 855 – 875 mm |
| GN1200X900X150T | 1200 x 900 x 150 mm | 855 – 875 mm |
| GN1500X1000X150T | 1500 x 1000 x 150 mm | 855 – 875 mm |
| GN1500X1500X150T | 1500 x 1500 x 150 mm | 855 – 875 mm |
