| 摘要 |
The invention provides a filter that has a plurality of through holes and satisfies the expression 2.5xA/B+52.5<=C<=2.5xA/B+60.2 (A<=20, 0<B<=20), where A(%) represents the ratio of pores with a pore diameter of 10 mum or less to the total pore volume in a wall part between the through holes; B(%) represents the ratio of pores with a pore diameter of 30 mum or more to the total pore volume in the wall part; and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
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