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Loam, which is dry, very well absorb water, however, when its wet, it becomes impervious to water. Loam tends to take all kinds of forms, once completed pereminanie and mixing, and then store these forms after drying. This feature of the material referred to as plasticity. Also, clay is endowed with binding ability. Lies in the fact that, when mixed with powdered solids (the same as sand), the mixture will also be homogeneous, which has plasticity, but to a lesser extent. Thus, the more clay in the water and admixtures of sand, the lower the plasticity of the mixture.
Loam divided into "fat" and "skinny." Fat Loam possess high ductility, as it become wet condition of sensations reminiscent of a fatty substance. Fat Loam is a brilliant mind, and slippery to the touch , the impurities in it in a minimal share. The mixture, which is obtained from it can be called delicate. When out of a clay brick making, then drying and firing, it gives the cracks, so that this does not happen, the entire batch is added substances which are of "emaciated" in nature. These substances may include sand, the potter battle, burnt brick, lean clay, sawdust and others.
Skinny are clay, which have low plasticity. At the touch it rough, with matte surface, it easily crumble, separating the ashy dust. Loam that are thin, contain a high proportion of impurities, do not give chips when cut with a knife. Bricks of this type of clay turns out crumbly and unstable.
Fundamental property of clay for bricks in favor of its perception by roasting, and generally related to elevated temperature. If soaked clay hardens in the air, dried and wiped off easily in the powder, it is not changing its internal structure, at elevated temperatures will occur the chemical processes that alter the composition of matter. Very high temperatures cause the clay to melt. That temperature, which makes the clay begins to melt, will show the level of fire clay. Refractoriness to different varieties differ. Some varieties of clay necessary to set the temperature for firing order of 2000 ° C, which is not easy to obtain even in factory conditions. In this case, there is a need to decrease refractoriness. To lower the melting point should be to add special substances (1%): lime, iron oxide, magnesium. Such additives are called flux.
Color of the clay can be varied: sometimes white, yellow, bluish, reddish brown with shades. From the color quality of clay bricks produced no change. After special training for the manufacture of bricks can accommodate any clay, will only excellent quality products. The most optimal clay is not too skinny and not too oily.

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