Patent ID: 7981188

Claim:
A method of manufacturing a honeycomb article, comprising the steps of: mixing inorganic material sources and a pore former with forming aids to form a plasticized batch, wherein the pore former has a particle size distribution with d ps ≦0.9, wherein d ps =(dp 90 −dp 10 )/dp 50 and dp 10 is a particle size wherein 10% of the particle volume has a smaller particle size, dp 50 is a median particle size wherein 50% of the particle volume has a smaller particle size, and dp 90 is a particle size wherein 90% of the particle volume has a smaller particle size; forming the plasticized batch into the honeycomb article; and firing the honeycomb article to remove the pore former, the fired honeycomb article having a multiplicity channels at least partially defined by porous cell walls, said walls including many pores and having a pore size distribution wherein no more than 1.0% of a total pore volume of the pore size distribution has a pore diameter of less than or equal to 7.0 microns.