Importance

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Abstract

A honeycomb structure constituted by porous cell walls forming a cell group consisting of a plurality of cells, and a honeycomb outer wall surrounding and holding the outermost peripheral cells located at the circumference of the cells, a porosity is 5% to less than 30%, a basic wall thickness (Tc) of the cell walls is 0.030 mm.ltoreq.T.sub.c <0.076 mm, an average surface roughness (Ra.sub.s) of the outer wall is 0.5 .mu.m.ltoreq.Ra.sub.s.ltoreq.10 .mu.m, and/or an average height (RzDIN.sub.s) on the surface of the outer wall from a local maximum point to a next local minimum point is 5 .mu.m.ltoreq.RzDIN.sub.s.ltoreq.50 .mu.m; and a process for producing such a honeycomb structure using a raw material having a specific average diameter. The honeycomb structure satisfies requirements of improved purification ability, erosion resistance and improved canning property at a good balance.

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First Claim