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Tabular alumina is a pure sintered corundum material with coarse, well-developed α-Al₂O₃ crystals, containing more than 99% Al₂O₃. Its crystals exhibit a two-dimensional plate-like or tablet-like morphology, with typical crystal sizes of 30~200 μm and some reaching 50~400 μm. This characteristic interlocking plate-like structure increases the mechanical strength of the grains. The intra- and inter-crystalline porosity consists mainly of uniformly distributed closed micropores, giving the product a combination of high bulk density, low apparent porosity, and low water absorption.