Specification and grade of marble slabs
Marble flat plate is a precision benchmark measuring tool made of natural high-quality stone, which is produced in strict accordance with GB/T860 1.200 1 and JC/T79-200 1. Marble flat plate is an ideal benchmark for testing instruments, precision tools and mechanical parts. Especially for high-precision measurement, because of its unique characteristics, cast iron flat plate is dwarfed.
Specification of marble flat plate: not more than 3000mm×5000mm, suitable for measuring the accuracy of various inspection work, and used as the benchmark for machine tool mechanical inspection and measurement; Check the dimensional accuracy or shape deviation of parts, and make accurate scribing and scribing.
Characteristics of marble slab
Marble slabs are made of high-quality underground rock layers. After hundreds of millions of years of natural aging, its shape is extremely stable, and there is no need to worry about deformation due to conventional temperature difference. The granite material selected by the marble slab through strict physical tests has fine crystals and hard texture. Because marble is a nonmetallic material, there is no magnetic reaction and no plastic deformation. Granite plate has high hardness and good accuracy retention. Marble inspection board has black luster, precise structure, uniform texture and good stability.
High strength and hardness. Marble board can maintain high precision under heavy load and general temperature, and has the advantages of no rust, acid resistance, wear resistance, no magnetization and no deformation. Physical characteristics of marble slab
Specific gravity of marble slab: 2970 ~ 3070 kg/㎡; Compressive strength of marble slab: 245 ~ 254 N/m ㎡; Strength abrasion of marble slab:1.27 ~1.47n/mm2; Linear expansion coefficient of marble slab: 4.6×10 ~ 6℃; Water absorption of marble slab: 0.13%; Shore strength of marble slab: more than HS70.
How to judge the quality of marble slab
When choosing marble slabs, we should not only observe them in the sun, but also determine whether they are natural historical materials and whether they can meet the requirements that granite is superior to nature. Generally speaking, the quality of marble first has the monitoring requirements of ingde.
There are also certain requirements for the size of the shape. Generally speaking, the length should not exceed one millimeter and the thickness should not exceed one millimeter. The flatness of the surface is often about 0.5 mm, and the diagonal deviation is about 0.5 mm..
If you want to see whether the appearance quality of marble is a high-quality product, you only need to see whether its color, color difference and pattern are harmonious and unified as a whole. If there are cracks, spots, color lines and other appearance defects on the marble surface, they are basically fake and shoddy products.
Through the above study and understanding, you must have a certain understanding of the specifications and grades of marble slabs now. Well, I hope today's content can explain something to you.