Patent ID: 7879432

Claim:
A honeycomb structure, comprising: honeycomb units, each of said honeycomb units having a plurality of through holes and two end faces, such that each of said plurality of through holes extends from one end face to another end face, all of the through holes being open on the one end face of the honeycomb unit, and each of said honeycomb units also having an outer face disposed around said plurality of through holes; a seal layer interposed between adjacent outer faces of each of said plurality of honeycomb units for adhering each of said honeycomb units together, wherein each of the honeycomb units comprises a first component having inorganic particles, and a second component chosen from inorganic fibers, inorganic whiskers, and a combination thereof, the material of the inorganic fibers and inorganic whiskers being chosen from alumina, silica, silicon carbide, silica alumina, potassium titanate, and aluminum borate, wherein a cross section area of each of the honeycomb units perpendicular to the through holes is about 5 to about 50 cm 2 ; and the surface roughness Rz of the outer face is about 5 to about 50 μm, and wherein a ratio of the total sum of the cross section areas of the honeycomb units perpendicular to the through holes to a cross section area of the honeycomb structure perpendicular to the through holes is about 85% or more.