Rice hulls are a primary element to silica cause the bricks is strong and able to tolerate more light but silica is the ability to absorb high water. If the bricks are high humidity will result in poor quality, and shell cockle is Ca is a root element. When burned, it became the CaO to add strength, but if there is a large amount in the high temperature combustion cause reactions with air and make a difference in the bricks.
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