Refractory bricks – a white, smooth brick, which has high strength and high fire resistance, made from special types of refractory clay. In the production of refractory bricks, in order to during the firing they will not crack in the original composition is administered up to 70% grog (fired refractory clay) are often added to coke or graphite powder, sometimes large grains of quartz. Depending on the added elements are different grade refractory bricks, which have different destinations. The choice of varieties is due not to a different temperature resistance, but different chemical properties of matter become heated, the properties of fly ash or fuel. Taken to distinguish between four classes of refractory bricks: 1. Silica brick can not withstand contact with lime, alkalis, oxides of iron. As a rule, it is used where a wall ovens come in contact only with flame, or metals.
Often, it is because it makes the arches reverberatory furnaces (such as fireplaces). Unlike ordinary bricks, it is completely homogeneous and contains no cavities. Because it is made from pure sandstone and quartz, cemented a small amount of clay, after firing, a brick acquires properties typical of natural sandstone. 2. Fireclay brick. This species has a very high percentage of clay. Fireclay brick is better without actually reacts to the action of alkalis.
Rapid changes of temperatures, and are not a problem for this class. Fireclay bricks are used where the temperature does not exceed 1000-1300 C. 3. Main bricks (the chemical term 'reason'). This class of bricks is a lime-magnesia refractory mass. Use them mainly in metallurgy, upon receipt of the Bessemer steel phosphorous ores. 4. Carbon brick is used only in specific industries. The simplified version of a molded graphite or coke used in blast furnaces. At home, experts advise to use fireclay brick, denoted by the letter 'W'. Subsequent to their digital stamps determine the size. For example: brick line – W-5, 230 * 114 * 65; brick line – W-8, 250 * 124 * 65; brick line – W-8, 250 * 124 * 65; Manufacturers of direct production of bricks is not limited. Produce bricks and other shapes, for example, wedge-shaped, used for laying the semi-circular arches and vaults of various radii of curvature. Dimensions and brand it as follows: Clean face – W-22, 230 * 114 * 65/55; wedge face – W-23, 230 * 114 * 65/45; Wedge arris – W-44, 230 * 114 * 65/55; Clin arris – W-45, 230 * 114 * 65/45. I would like to draw your attention to the fact that when laying refractory bricks needed particularly careful grinding them, so that seams can be obtained as more subtle. Connect bricks fire-clay mortar, which is added to crushed firebrick. It is worth noting that the common 'red' brick can not withstand very high temperatures. At a temperature of 'white heat' (this procedure 1200 C) it begins to melt, and when cool – to crumble. Of course, at normal room temperature of the furnace does not exceed 800 C, and therefore, in principle, in its manufacture can be dispensed with refractory bricks. But if you look at The fact that the refractory bricks high thermal conductivity and, therefore, it accumulates and gives great heat, in the manufacture of fireplaces and baths in our range are likely to fall precisely on this it. Equally important is the beautiful appearance is extremely smooth, flat, light brown or straw-yellow bricks.