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high degree of imperviousness. These qualities are thoroughly described in ASTM C-126 Ceramic Glazed Structural Clay Facing Tile and ASTM C-1405 Glazed Brick for Units Fired Over 1500°F. Some brilliant glazes such as red and orange are available but they are fired at lower temperatures in a double fired process. They do not meet all the requirements of ASTM C-126 and ASTM C-1405. Glazed
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