Grade selection: according to the allowable deviation of specifications and dimensions, the allowable tolerance of flatness and angle, as well as the appearance quality, surface finish and other indicators, marble plates are divided into three grades: superior products, first-class products and qualified products; The grading and identification of marble plates are mainly through the detection of instruments and measuring tools.
Check the appearance quality
The appearance of marble plates of different grades is different. Because marble is naturally formed, defects are inevitable. At the same time, the advantages and disadvantages of processing equipment and measuring tools are also the causes of plate defects. Some plates are not full (warped or sunken), have defects (cracks, sand holes, color spots, etc.), and have different specifications (such as missing edges and corners, and the plates are not straight). According to the national standard, all grades of marble plates are allowed to have certain defects, but the superior products are not so obvious.
Choose a pattern color
Marble plates are colorful, with various colors and patterns, which is exactly the charm of marble plates. The colors are basically consistent, the color difference is small, and the patterns are beautiful. Otherwise, the decorative effect will be seriously affected.
Test surface glossiness
The surface glossiness of marble plate will greatly affect the decorative effect. Generally speaking, the polished surface of high-quality marble plate should have a mirror like luster, which can clearly reflect the scenery. However, due to the different chemical composition of marble of different quality, even products of the same grade will have a great difference in glossiness. Of course, the surface glossiness of the plates with the same material and different grades will also be different. In addition, the strength and water absorption of marble plate are also important indicators to evaluate the quality of marble.
