Clay brick color is generally light yellow and brown, sometimes even dark brown, and sometimes there will be brown and black spots, dark brown that iron oxide content is very high, yellow and yellow is more normal color.
Single from the color can not completely determine the quality of clay brick. Brown and dark brown clay brick, although the fire resistance is low, but the light does not mean that the clay brick refractoriness must be high, Tian clay clay also has many white impurities, such as calcium oxide, potassium oxide sodium oxide and so on. If they are high in clay bricks, the clay bricks can be made lighter in color, but the refractoriness is reduced.
We recommended customers in the procurement of clay brick, the appearance should be purchased for the yellow and light yellow clay brick. But the melting point of the refractory brick need to be precipitated, so as to ensure that the clay brick sintering temperature has reached.
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