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Marble evaluation method
Nov 09, 2018

Marble evaluation method:

1) Select the grade: according to the allowable deviation of the specification size, the allowable tolerance of the flatness and angle, as well as the appearance quality, 

surface finish and other indicators, the marble sheet is divided into three grades of superior grade, first grade and qualified grade; Grading and identification are mainly identified by the detection of instruments and gauges.

2) Check the appearance quality: the appearance of different grades of marble plates is different. Because marble is naturally formed, defects are inevitable, and the advantages and disadvantages of processing equipment and measuring tools are also the causes of sheet defects. Some sheets are not full (warped or sunken), and sheets are defective (cracks, sand holes, colors Spot, etc.), the plate body 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 difficult to be obvious.

3) Choosing the color of the pattern: The color of the marble plate is colorful, the color is various, and the patterns are not the same. This is the precious charm of the marble plate. 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.

4) Detecting surface gloss: The glossiness of the surface of the marble board will greatly affect the decorative effect. In general, the polished surface of a high-quality marble sheet 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 a slight difference in the gloss of the surface of the sheet between the 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.

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