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High Alumina Anchor Brick - RS Fire Bricks Manufacturer. High Alumina Anchor Brick Definition . Anchor brick is generally made of high alumina material having an Al 2 O 3 content of no less than 55%, whose bulk density is about 2.34 g/cm 3, compressive strength is more than 50MPa, and refiring linear expansion is about 0.05% under the temperature of 1500℃.
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