Ngk Insulators, Inc.

Yu Torii

Shuji Ueda

Koichi Sendo

Shungo Nagai

A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed, surrounding a plurality of cells which serve as fluid through channels extending from a first end face to a second end face; and a plugging portion provided at an open end on the first end face side or the second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, an average pore diameter of the partition wall is 20 to 30 μm, an average equivalent circle diameter of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 18 to 30 μm, and a number per unit area of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 400 per mmor more.

Honeycomb filter

A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed to surround a plurality of cells and a plugging portion provided at an open end on a first end face side or a second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, a number per unit area of pores which exist at a surface of the partition wall and which have equivalent circle diameters exceeding 3.0 &#x3bc;m is 1400 per mmor more, and, in a pore diameter distribution which indicates a cumulative pore volume of the partition wall, with a log pore diameter on a horizontal axis and a log differential pore volume (cm/g) on a vertical axis, a half-value width of a first peak that includes a maximum value of the log differential pore volume is 0.30 or less.

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Nagoya, Japan

Yu Torii