Due to different applications of natural marble, its industrial and technical requirements have different emphasis.
Natural marble block
The main requirements for natural marble block in the building materials industry standard (JC202-92) are as follows:
The block must have the shape of a right angle parallelepiped.
The specification and size of the block shall be greater than or equal to 100cm in length, 50cm in width and 70cm in height.
The appearance quality requires that the color and pattern of the same batch of blocks should be basically consistent; The appearance quality grade of corner, edge and crack of the block shall comply with the provisions in Table 4.25.6.
Physical property requirements (JCT202-2001): bulk density shall not be less than 2.6g/cm3; Water absorption shall not be greater than 0.5%; The drying compression strength is not less than 50MPa; The bending strength shall not be less than 7.0MPa.
For craft carving
It is required that the marble structure is compact, the particles are uniform and not easy to fall off, there are no cracks, no inclusions, and the color, pattern, block size and shape meet the requirements of shaping, generally more than 0.15 m3. If used outdoors, the rock surface does not need to be fresh, but it requires good weathering resistance and low water absorption.
