How to distinguish between good and bad marble
2023-11-27 14:42
Choose a good grade: According to the allowable deviation of specifications and dimensions, flatness and angle tolerances, as well as appearance quality, surface smoothness and other indicators, marble panels are divided into three grades: excellent, first-class, and qualified; The grading and identification of marble panels are mainly determined through the detection of instruments and measuring tools.
Check the appearance quality
The appearance of different grades of marble panels varies. Because marble is naturally formed, defects are inevitable. The quality of both processing equipment and measuring tools is also a cause of defects in the board. Some boards have incomplete boards (warped or concave), defects (cracks, sand holes, color spots, etc.), and inconsistent board specifications (such as missing edges or uneven boards). According to national standards, various grades of marble panels are allowed to have certain defects, but the superior products are not so obvious.
Choose patterns and color tones
Marble panels are colorful, diverse in color tones, and have unique patterns, which is precisely the charm of the precious value of marble panels. The basic consistency of color tone, small color difference, and beautiful patterns are the specific manifestations of excellent varieties, otherwise it will seriously affect the decorative effect.
Detecting surface glossiness
The surface glossiness of marble panels will greatly affect the decorative effect. Generally speaking, the polished surface of high-quality marble panels should have a mirror like luster, which can clearly reflect the scenery. However, due to the different chemical compositions of marble of different qualities, even products of the same grade can have significant differences in their glossiness. Of course, there may be some differences in the surface gloss of boards with the same material but different grades. In addition, the strength and water absorption of marble panels are also important indicators for evaluating the quality of marble.
Home inspection
Common test one: Drop a drop of ink on the back of the stone. If the ink quickly disperses and leaches out, it indicates that the particles inside the stone are loose and the quality is poor; But if the ink droplets do not penetrate, it indicates that the stone is dense and of good quality.
This is actually a simple test for the water absorption rate of stone. If the ink droplets do not penetrate, it may indicate that the texture of the stone is relatively dense and the water absorption rate is low. Marble is usually coated with a layer of protective agent to prevent stains from penetrating. Even if customers see that ink droplets do not penetrate, it is likely that the protective agent is working, rather than reflecting the performance of the stone itself. In addition, if the water on the back of the stone is in the form of water droplets, it indicates that it has been coated with protective agents, making it difficult to absorb water and may also cause it to not adhere to cement. Therefore, it can be considered that the smaller the water absorption rate on the front of the marble, the better. However, it should also be considered whether the back can adhere well to cement adhesives.
Common Test 2: Vinegar reacts with marble to produce calcium acetate. Therefore, dropping vinegar on marble can cause changes and roughness on the surface of the stone, indicating whether it is truly marble.
This test is theoretically reasonable, but due to the weak acidity of acetic acid itself, the test requires a longer reaction time, and consumers cannot see the results at the moment. The effect of using dilute hydrochloric acid is more obvious.
Common Test Three: Strike the marble and pay attention to the sound. If the sound is clear, it indicates that the product quality is good, and the interior is fine and even without cracks; If the voice is rough and hoarse, it indicates that there are cracks and loose texture inside the marble.
This test can only indicate that the texture of the stone is relatively hard, brittle, and has high strength, and cannot be used as a standard to judge the quality of the stone, because the sound emitted by the stone is related to its variety and size. This type of marble with high strength is more suitable for use on the ground.
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