| abstract |
The object of the present invention is, for example, used by being inserted into a pipe constituting an exhaust passage of an internal combustion engine, and can clearly distinguish an exhaust gas inflow side from an exhaust gas outflow side. The present invention is to provide a columnar honeycomb structure in which a large number of through-holes are arranged in parallel in the longitudinal direction with a wall portion between the outer peripheral surface and the honeycomb structure. Information on the honeycomb structure is displayed on the end face by a two-dimensional code. |