| 摘要 |
In a honeycomb filter 20, a partition portion 22 has a thickness tp of 150 µm or more and 460 µm or less, a trapping layer constituting a trapping layer 24 has an average thickness t Ave of 5 µm or more and 80 µm or less, the film thickness ratio Y 1 of a downstream thickness t 1 to an up- and mid-stream thickness t hm , which is a mean value of an upstream region and a midstream region of the trapping layer 24 of the honeycomb filter 20, satisfies the relationship of the formula (1), the film thickness ratio Y 2 of the maximum thickness t max of a trapping layer of the trapping layer 24 to the average thickness t Ave of the trapping layer satisfies the relationship of the formula (2), and a cell 23 has a hydraulic diameter HD in satisfying the relationship of the formula (3). |
