The physical structure of marble cubes is stable with a dense organization, which, upon impact, does not cause particle detachment or frayed edges on the surface, thereby not affecting its flatness accuracy. It ensures long-term shape stability, has a low coefficient of linear expansion, and is suitable for vertical measurements in industrial production.
Marble squares feature vertical parallel frame combinations for checking right angles and are suitable for high-precision mechanical and instrument inspections as well as checking the non-perpendicularity between machine tools. These marble squares are made from high-quality marble, which is recrystallized limestone primarily composed of CaCO3. Limestone softens under high temperature and pressure, re-crystallizes into marble when its minerals change, and is a metamorphic rock formed by the original rocks in the earth's crust under internal high-temperature and high-pressure actions. The internal forces of the crust cause qualitative changes in the original rocks, altering their structure, texture, and mineral composition. The newly formed rocks resulting from this transformation are called metamorphic rocks. Marble is primarily composed of calcite, limestone, serpentine, and dolomite, with its main component being calcium carbonate, accounting for over 50%. As marble typically contains impurities and is prone to weathering and erosion due to the action of carbon dioxide, carbides, and moisture in the atmosphere, its surface quickly loses luster. Marble is mainly used for processing into various shaped materials and slabs. Therefore, marble squares offer features such as non-deformation, high hardness, strong wear resistance, and anti-corrosion properties.
The square marble standards for flatness and perpendicularity comply with GB6092-85.
The stable physical structure of marble cubes is dense, with no particle detachment upon impact, and the surface does not fray, thereby not affecting its flatness accuracy. It can ensure long-term shape stability, has a low coefficient of linear expansion, and is suitable for vertical measurements in industrial production.
