Select the grade: according to the allowable deviation of the specification size, the tolerance of the flatness and angle, as well as the appearance quality, surface finish and other indicators, the marble board is divided into three grades of superior grade, first grade and qualified grade; grade of marble board Identification is mainly identified by the detection of instruments and gauges.
Check the appearance quality
Different grades of marble slabs have different appearances. 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 cause of sheet defects. Some plates are not full (warped or sunken), and the plates are defective (cracks, sand holes, stains, etc.), and the plate specifications are different (such as lack of edges and corners, plate body is not correct). According to national standards, marble slabs of all grades are allowed to have certain defects, but the superior products are not so obvious.
Pick a pattern of shades
The marble plates are colorful, the colors are varied, and the patterns are the same. This is the precious charm of marble plates. The color tone is basically the same, the color difference is small, and the beautiful pattern is the specific performance of the excellent variety, otherwise it will seriously affect the decorative effect.
Detect surface gloss
The surface gloss of the marble sheet will greatly affect the decorative effect. In general, the polished surface of high-quality marble slabs should have a mirror-like luster that clearly reflects the scene. However, due to the different chemical composition of different quality marbles, even the same grade of products, the difference in gloss will be great. Of course, there will be some differences in the gloss of the surface of the board between different grades of the same material. In addition, the strength and water absorption of marble sheets are also important indicators for evaluating the quality of marble.