How to identify the merits of marble

2023-02-17 15:16:16

Select grade: according to the allowable deviation of the specification size, allowable tolerances of flatness and angle, as well as the appearance quality, surface finish and other indicators, the marble plate is divided into three grades: excellent grade, first grade and qualified grade; grade of marble plate The identification is mainly through the detection of instruments and measuring tools.
Appearance quality: The appearance of different grades of marble plate is different. Because marble is naturally formed, defects are inevitable. At the same time, the pros and cons of processing equipment and measuring tools are also the causes of sheet defects. Some plates are not full (warped or sag), plates have defects (cracks, blisters, stains, etc.), plate body specifications (such as lack of edges and corners, the body is not correct) and so on.
Pattern tone: The marble plate is colorful, with various colors and patterns, which is exactly the charm of the marble plate. The color tone is basically the same, the color difference is small, and the beautiful pattern is a concrete expression of the fine variety, otherwise it will seriously affect the decorative effect.
Surface gloss: The level of gloss on the marble plate surface will greatly affect the decorative effect. In general, the polished surface of a high-quality marble plate should have a mirror-like gloss and clearly reflect the scenery. However, due to the different chemical compositions of marbles of different qualities, the difference in glossiness will be great even for products of the same grade. Of course, the surface gloss of the board between different grades of the same material will also have some differences. In addition, the strength and water absorption of marble plates are also important indicators for evaluating marble quality.

About radioactivity

Experts said that the statement that natural marble has higher radioactivity is actually a misunderstanding and it is caused by poor understanding of its radioactivity. According to reports, radioactivity exists in all substances, including water and air. In the same way, radioactivity is also present in natural marble. The most important thing is whether the purchased marble exceeds the standard and where marble is decorated.
In the "Standard for Control of Radioactive Protection of Natural Marble Products", the specific activities of radioactivity in stone building materials are classified into three categories. Class A: The scope of use is not limited; Class B: not for the living room, interior, can be used for other buildings, exterior finishes; Class C: can be used for all exteriors of buildings. Marble is actually marble. It is made of limestone in sedimentary rocks that is degraded by external factors such as high temperature and high pressure. It is mainly composed of calcite and white cloud particles. Many years of actual test results show that calcite and dolomite generally have low radioactivity. Marbles that are metamorphosed by very low-activity limestone are also very low in radioactivity and can be safely used.
Artificial marble is made of granite gravel as a filler, cement, gypsum and unsaturated polyester resin as the binder, and is formed by stirring, grinding and polishing. Most of such marble contains harmful gases. The level of radioactivity in artificial marble depends on the amount of granite filler and its own radioactivity and the radioactivity of cement gypsum. The harmful substances mainly depend on the amount of volatile substances such as formaldehyde and benzene contained in the binder. Artificial marble needs to be added to cement. A certain amount of ash should be added after the cement is fired. The ash of some inferior coals will have higher radioactivity. At the same time, there will be gypsum in the artificial marble.
Regardless of whether you purchase natural or artificial marble, you must ask the business for a radioactive and harmful gas indicator test report, or ask a professional inspection agency to perform the inspection.

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