kitchen granite countertops R & D Research

1, granite
Granite is igneous rock, magma ejected from the ground and the intrusion cooling crystallization and metamorphic rocks such as granite formation. With visible crystal structure and texture. It consists of feldspar (usually potash feldspar and Austria feldspar) and quartz composition, mixed with a small amount of mica (biotite or muscovite) and trace minerals, such as: zircon, apatite, magnetite, ilmenite and sphene, etc.. Granite main component is silicon dioxide, the content of about 65% -85%. Chemical properties of granite weak acidity. Generally, white or gray granite, slightly, due to a mixture of dark crystal, with the appearance of spots,
The addition of K-feldspar makes it red or flesh. Granite formed by the crystallization of magma cool slowly, deep below the surface, when the cooling rate of abnormal slow, it form a very rough texture of granite, known as crystalline granite. Granite and other crystalline rocks form the basis of continental plates, it is also exposed to the Earth’s surface is the most common intrusive rocks.
The proportion of granite between the 2.63 to 2.75, its compressive strength is 1,050 ~ 14,000 kg / sq cm (15,000 20, 000 pounds / square inch). The intensity ratio of sandstone as granite, limestone and marble, the more difficult mining. As the granite formation of the structure of the special conditions and firm characteristics of their unique properties as follows:
(1) has a good decorative performance, applicable in public places and outdoor decoration.
(2) has excellent processing performance: sawing, cutting, polishing, drilling and carving. Its precision can reach 0.5μm below the brightness up to 1600 or more.
(3) good resistance to abrasion, 5-10 times higher than cast iron.
(4) thermal expansion coefficient is small, not easily deformed, and indium steel similar to that temperature is minimal.
(5) elastic modulus, higher than cast iron.
(6), rigidity, damping within the large, more than 15 times the steel major. To shock, vibration.
(7) granite has a brittle, damaged only a partial loss, does not affect the overall straight sex.
(8) granite of the chemical stability, easy to weathering, to acid, alkali and corrosive gases, erosion, chemical resistance and directly proportional to silica content, the service life of 200 years.
(9) the granite is not conductive, non magnetic, field position and stability.
Typically, the granite is divided into three different categories:
Fine-grained granite: feldspar crystals average diameter of 1 / 16 ~ 1 / 8 inch.
Medium grain granite: feldspar crystals average diameter of about 1 / 4 inch.
Coarse-grained granite: feldspar crystals average diameter of about 1 / 2 inch and larger diameter crystals, and some even up to several centimeters. Relatively low density of coarse-grained granite.
2, marble
Marble metamorphic rocks from the sedimentary rocks and sedimentary rocks formed after the formation of limestone recrystallization of a metamorphic rock, often accompanied by the texture of biological remains. Main component is calcium carbonate, the content of about 50% -75% weakly alkaline. Some marble with a certain amount of silica, some do not contain silicon dioxide. Fine particles (defined as calcium carbonate), are generally more irregular distribution of surface streaks, hardness lower. Most structural features marble composition to have the following properties:
(1) good decorative performance, marble does not contain radiation and beautiful color, rich colors, are widely used in interior walls, floor decoration. Excellent processing performance: sawing, cutting, polishing, drilling and carving.
(2) marble wear well, not easy to aging, the lifecycle of 50-80 years.
(3) in the industry, the marble has been widely applied. Such as: for raw materials, cleaning agents, solvents and other metallurgy.
(4) Marble is not conductive, non magnetic, field position and stability and other characteristics.
From a commercial point of view, all of nature, capable of polishing both calcareous rock called marble, some of the dolomite and serpentine as well. Because the marble is not applicable to all the buildings are occasions, the marble should be divided into A, B, C and D four. This classification method is particularly suitable for relatively crisp C-class and D class of marble, they are installed before or during the installation require special handling.
The following breakdown:
Class A: high quality marble, with the same, excellent processing quality, free of impurities and porosity.
B: characteristics of marble close to the former category, but slightly worse than the former processing quality; have natural defects; need a small amount of separation, glue and fill.
C class: there are some differences in processing quality; flaws, porosity, texture, fracture is more common. These differences in the difficulty of repairing medium, through separation, adhesive, filling or reinforcement of these methods in one or more can be realized.
D: Characteristics and C class similar to marble, but it contains more natural flaws, the biggest difference in the quality process requires a method many times with surface treatment. Such marble implicated a number of colorful stone, they have very good decorative value.