What is the quality standard of stone?

Gloss is a very important index of mirror panel. Gloss refers to the degree of reflection of visible light on the surface of veneer. In stone standard, glossiness is called specular glossiness. According to the current standard of natural granite plate, the front of mirror plate should have mirror luster, which can clearly reflect the scenery. The mirror gloss value of the mirror plate shall not be less than 75 gloss units, otherwise it shall be implemented according to the model agreed by both parties. The minimum gloss specified in the standard is a basic value. When the gloss value is 80 ~ 90 gloss units, most granite plates have good mirror luster. Therefore, users can indicate the gloss value in the purchase contract according to their different requirements, or the gloss value of the agreement board shall prevail. In the newly revised national standard for natural granite slabs, the minimum gloss is increased from 75 gloss units to 80 gloss units.

Inferior stone is mainly manifested in the following aspects: (l) the pattern and color of the surface. As decorative stone, people mainly value the decorative effect of its processed surface. Some patterns on the surface of high-quality stone are beautiful and elegant, some are elegant, some are flowing, and some are shining like stars, which makes the decorative surface have excellent decorative effect. However, the surface pattern of inferior stone is not beautiful after processing, which can not give people a beautiful enjoyment. Therefore, the tone of stone surface pattern is the main index to evaluate the quality of stone. As mentioned above, the colored marble produced in Dali, Yunnan Province is the best marble because of its rare patterns and colors.