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nature : ordinary clay as raw material, shaping, drying and baking from the brick. With the clay of impurities and used to bake the different conditions, was reddish-brown or gray, said the red brick and green, mainly for the masonry wall so. Standard specifications : 240 mm × 115 mm × 53 mm. Appearance is divided into first-, second-. Grade 200,150,100,75,50 five minutes.
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