Little knowledge about marble, get
Marble is formed from sedimentary rock and metamorphic rock of sedimentary rock. It is a metamorphic rock formed after limestone recrystallization, usually accompanied by the texture of biological remains. The main component is calcium carbonate, with a content of about 50% - 75%, which is weakly alkaline. Some marbles contain a fixed amount of silica, and some do not contain silica. The particles are fine (refer to calcium carbonate), and the distribution of surface stripes is generally irregular, with low hardness. The composition and structural characteristics of marble make it have the following properties:
(1) Good decorative performance, marble does not contain radiation and has bright colors and rich colors. It is widely used for decoration of indoor walls and floors. It has excellent processing performance: sawing, cutting, polishing, drilling, engraving, etc.
(2) Marble has good wear resistance and is not easy to age. Its service life is generally about 50-80 years.
(3) Marble is widely used in industry. For example: for raw materials, purification agents, metallurgical solvents, etc.
(4) Marble has the characteristics of non-conductive, non-magnetic and stable field.
From a commercial point of view, all naturally formed limestone rocks that can be polished are called marbles, as are certain dolomites and serpentine rocks. Because not all marbles are suitable for all building occasions, marbles should be divided into four categories: A, B, C and D. This classification method is especially applicable to relatively brittle class C and class D marbles, which need special treatment before or during installation.
The specific classification is as follows:
Class A: excellent marble, with the same and excellent processing quality, without impurities and pores.
Class B: the characteristics are similar to the previous class of marble, but the processing quality is slightly worse than the former; Have natural defects; A small amount of separation, gluing and filling are required.
Class C: there are some differences in processing quality; Defects, pores and texture fractures are common. The difficulty of repairing these differences is moderate, and it can be achieved by one or more of separation, gluing, filling or reinforcement.
Class D: the characteristics are similar to those of class C marble, but it contains more natural defects, and the processing quality is very different. It needs multiple surface treatments with the same method. This kind of marble involves many colorful stones, which have good decorative value.