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Clay-straw is more appropriate (in my opinion) for smaller buildings (>1000 sq. ft.) because of labor and time issues. In Germany, this type of construction is known as leichtlehm which translate to âlight loamâ. Light clay straw is akin to wattle and duab which has been used in Europe since the 12th century.
The oxides of aluminium (alumina), silicon (silica) and magnesium (magnesia) are the most important materials used in the manufacturing of refractories. Another oxide usually found in refractories is the oxide of calcium (lime). Fire clays are also widely used in the manufacture of refractories.cidic refractories consist of mostly acidic materials like alumina (Al 2 O 3) and silica (SiO 2). They are generally not attacked or affected by acidic materials, but easily affected by basic materials. They include substances such as silica, alumina, and fire clay brick refractories.