| 摘要 |
Product formed from a ceramic material, at least part of the product not being formed from amorphous silica, having pores and satisfying the following criteria: (a′) at least 70% by number of the pores are tubular pores extending substantially parallel to each other in a longitudinal direction; (b′) in at least one cross-section plane, at least 30% by number of the pores have a section of convex hexagonal shape, these pores being known hereinbelow as hexagonal pores, at least 80% by number of the hexagonal pores having a roundness index of greater than 0.70, the roundness index being equal to the ratio SA/LA of the lengths of the small and long axes of the ellipse in which the section is inscribed; the mean size of the cross sections of the pores is greater than 0.15 μm and less than 25 μm.
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