China Reclaimed Grey Bricks Suppliers, Manufacturers ...
Product Features. Blue bricks (gray bricks) are made by firing clay. Clay is the product of long-term weathering of certain aluminosilicate minerals and is named after its strong viscosity. The clay is mixed with water to make bricks, which are calcined in a brick kiln (900℃-1100℃, and lasts 8-15 days) to make bricks. Clay contains iron.
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