Patent ID: 8663356

Claim:
A gasoline engine filter having a honeycomb structure comprising: a honeycomb structure body having porous partition walls forming a plurality of divided cells that each function as a fluid passage, an outer wall present at an outermost circumference of the honeycomb structure body, and plugging portions provided at open ends of given cells at a fluid inlet-side end face of the honeycomb structure body, as well as at open ends of residual cells at a fluid outlet-side end face of the honeycomb structure body; wherein a thickness of each partition wall is 50.8 μm inclusive to 161.5 μm exclusive; wherein a cell density is 15.5 to 62.0 cells/cm 2 ; wherein a cell opening ratio of the honeycomb structure body is 76 to 91%; wherein a porosity of the partition walls is 35 to 45%; wherein an average pore diameter of the partition walls is 2 μm inclusive to 10 μm exclusive; wherein a material of the partition walls includes at least one member selected from the group consisting of cordierite, aluminum titanate, silicon carbide, alumina and mullite; and wherein a value obtained by dividing the average pore diameter of the partition walls by the thickness of the partition walls is larger than 0.043 but smaller than 0.064.