Granite Inspection and Measurement Working Platform
Welding Wonders Forging Excellence Together
PRODUCTS DETAIL
Granite precision instrument platform, made of high-quality “Jinan Blue” stone material through mechanical processing and manual grinding. High, no deformation, good stability, long service life, suitable for measurement work in mechanical factories and laboratories.
The main mineral composition of “Jinan Blue” granite is hornende, plagioclase, biotite, and a small amount of magnetite, with a black color, precise structure, and after billions of years of aging, uniform, good stability, high strength, and high hardness, which can maintain high precision under heavy load.
Advantages:
- High precision, good stability, and not easy deform, which can guarantee the measurement accuracy at room temperature.
- Does not rust, resistant to acid and alkali, and does not require special maintenance.
- wear resistance and long service life.
- Scratches and bumps on the working surface do not affect the measurement accuracy.
- There is no magnetization problem.
. It can slide smoothly without any drag feeling during measurement.
The precision of the granite flat plate is referenced to various advanced national standards, and the flatness tolerance is based: JB/T7975-1999 standard: 000 grade = 1 × (1 d/1000) um;00 grade = 2 × (1 d/1000) um; 0 grade = 4 × (1 d/1000); 1 grade = 8 × (1 d/1000) um (d is the diagonal mm) (measurement temperature is generally 20 ± ℃).
COMPARISON OF GRANITE MATERIALS
| content | Jinan Black | Indian Black | Sesame Black 654 |
| Specific Gravity | 3100-3300kg/m3 | 3200-3300kg/m3 | 2900-3000 kg/m3 |
| Elastic Modulus | 1.27×105 N/mm2 | 1.29×105 N/mm2 | 1.27×105 N/mm2 |
| Coefficient of Linear Expansion | 4.61×10 -6/℃ | 4.61×10 -6/℃ | 4.61×10 -6/C |
| Thermal Expansion Coefficient | 0.18%/C | 0.18%/°C | 0.2%/C |
| Water Absorption | <0.013% | <0.011% | <0.013% |
| Rockwell Hardness | >70.9 | >70.9 | >70.9 |
| Radiation Equivalent | 0.38uSv/h | 0.35uSv/h | 0.38uSv/h |
| Dry Compressive Strength | 220.1MPa | 221.1MPa | 218.3MPa |
| Appearance | Evenly distributed white specks likesnowflakes (appearing translucent),with a clean and shiny appearanceafter maintenance. | Evenly distributed white specks likesnowflakes, with a black and glossybase material. After maintenance,the appearance is clean and shiny. |
There are evenly distributed whitespecks (non-transparent), larger inpattern compared to Jinan Black.After maintenance, the appearanceis clean but less glossy than JinanBlack. |
| Precision Retention | Below 5 micrometers (um) | Below 5 micrometers (um) | 5-10um |
| Ease of Processing | Easy | Hard | Harder |
| Due to China’s environmental policies, the mining of Jinan Black granite has been halted since 2006. After 15years, large-sized jinan Black granite blocks have become scarce, only a few pieces can still be found, and it’s nolonger possible to obtain them in large quantities. |
|||
