2023-11-27

What are the advantages of natural marble

Nowadays, more and more households are installing natural marble, which looks very beautiful and fashionable. What are the advantages of natural marble? PChouse, let's take a look together. 1. Dense structure Natural marble has a dense structure, natural texture, and a relatively thick texture. It is easy to maintain and clean, and its service life is also long. It is not affected by moisture and has no astringency. The natural marble material is very delicate and hard, and each piece of marble has a different pattern, which is very beautiful. 2. High hardness Marble has high hardness, good rigidity, and is not easily cracked or deformed. Its compressive strength, wear resistance, and decorative properties are good. 3. Good stability Natural marble has a very small coefficient of linear expansion, small temperature deformation, no magnetization, good stability, and is easy to process. However, it cannot withstand sharp objects or heavy impacts, and natural marble has little elasticity.

2023-11-27

How to distinguish between good and bad marble

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.

2023-11-27

Introduction to Marble

Marble originally refers to white limestone with black patterns produced in Dali, Yunnan Province. Its profile can form a natural ink landscape painting. In ancient times, marble with formed patterns was often selected to make screens or inlays. Later on, the name marble gradually evolved to refer to all kinds of colored and patterned limestone used as building decorative materials. White marble is generally called White Marble, but it is also called marble for the white marble used to make statues in the West. There is a saying about the name of marble - in the past, the quality of marble in Dali, China was the best. Therefore, it is named.

2023-11-27

Testing methods for stone materials

Testing methods for natural decorative stone materials GB/T 99663-2001 Test Methods for Natural Decorative Stones Part 3: Test Methods for Bulk Density, True Density, True Porosity, and Water Absorption 1 Scope This standard specifies the equipment and measuring tools, specimens, test procedures, result calculations, and test reports used for the volumetric density, true density, true porosity, and water absorption of natural decorative stone. This standard is applicable to the volume density, true density, true porosity, and water absorption tests of natural decorative stone. 2 Equipment and measuring tools 2.1 Drying oven: The temperature can be controlled within the range of 105 ℃± 2 ℃. 2.2 Balance: Maximum weighing 1000g, sensitivity 10mg; The maximum weight is 200g, and the sensitivity is 1mg. 2.3 Pycnometer: Volume 25mL to 30mL. 3 samples 3.1 Bulk density and water absorption sample: The sample is a cube with a side length of 50mm or a cylinder with a diameter and height of 50mm, with a dimensional deviation of ± 0.5mm. Five yuan per group. The sample is not allowed to have cracks. 3.2 True density and true porosity samples: Take about 1000g of clean samples and crush them into particles smaller than 5mm; Reduce to 150g using the quartering method, and then grind it into a porcelain mortar that can pass through 63? M standard sieve powder. 4 Test steps 4.1 Bulk density and water absorption rate 4.1.1 Place the sample in a drying oven at 105 ℃± 2 ℃ and dry it to a constant weight. The difference in mass between two consecutive times should be less than 0.02%. Cool it in a dryer to room temperature. Weigh its mass (m0) to the nearest 0.02g. 4.1.2 Soak the sample in distilled water at 20 ℃± 2 ℃ for 48 hours, then remove it and wipe off the surface moisture of the sample with a wrung out wet towel. Immediately weigh its mass (m1) to the nearest 0.02g. 4.1.3 Immediately place the water saturated sample in a basket and immerse the basket and sample together in distilled water at 20 ℃± 2 ℃. Weigh the sample in water (m2) (note that when weighing, carefully remove any bubbles attached to the basket and sample), accurate to 0.02g.

2023-11-27

What is natural stone?

1. Natural stone is mainly divided into two types in daily use: marble and granite. Generally speaking, anything with texture is called marble, while those with speckled spots are called granite. This is broadly speaking. Narrowly speaking, marble refers to the stone produced in Dali, Yunnan. In fact, there are not many stones that have been sorted out in various places now. 2. Marble and granite can also be distinguished from geological concepts. Granite is an igneous rock, also known as acidic crystalline plutonic rock, which is the most widely distributed type of rock in igneous rocks. It is composed of feldspar, quartz, and mica, with silica as the main component, accounting for about 65% to 75%. The rock is hard and dense 3. The so-called igneous rock is a rock formed by the condensation and crystallization of underground magma or volcanic lava. The content of silica in igneous rocks, the properties of feldspar, and their content determine the properties of stone. When the content of silicon dioxide is greater than 65%, it belongs to acidic rocks. When basic minerals such as orthoclase, plagioclase, and quartz form crystals in this rock, it has a granular structure and is called granite.

2023-11-27

Protection of doorplate stone after cleaning and renovation

After cleaning and renovation, the micropores of stone have been opened, which increases the specific surface area, so that its adsorption capacity for dust and dirt is increased. If it is not protected in time, it is easy to be polluted again.