| 摘要 |
A honeycomb structure (20) comprising two or more honeycomb units (10) having a plurality of trough holes (12) arranged in parallel along the longitudinal direction, and sealing material layers (26) for bonding the units (10) at outer surfaces (13) where the trough holes (12) are not opened. Assuming the product of the apparent density of the honeycomb unit (10) and the volume ratio of the honeycomb units (10) to the entirety is A (g/cm^3), the product of the apparent density of the sealing material layer (26) and the volume ratio of the sealing material layers (26) to the entirety is B (g/cm^3), and the specific surface area per unit volume of the honeycomb structure (20) is C (m^2/L), the following expression (1) is satisfied by the honeycomb structure (20); 2<=A/B<=0.0002xC+5(28000<=C). Consequently, purification performance of exhaust gas can be enhanced by holding the temperature with the sealing material layers (26) covering the outer circumferences of the units (10). |
