Patent ID: 7179316

Claim:
A diesel particulate filter comprising a plugged, wall-flow honeycomb filter body composed of cordierite and having a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein: the filter exhibits a CTE (25–800° C.) of less than 13×10 −7 /° C., a bulk filter density of less than 0.60 g/cm 3 , a median pore diameter, d 50 , of less than 15 micrometers, a porosity and pore size distribution that satisfy the relationship P m ≦3.75, wherein P m is equal to 10.2474{1/[(d 50 ) 2 (% porosity/100)]}+0.0366183(d 90 ) −0.00040119(d 90 ) 2 +0.468815(100/% porosity) 2 +0.0297715(d 50 )+1.61639(d 50 −d 10 )/d 50 , wherein d 10 , and d 90 are pore diameters at 10% and 90% of the pore size distribution on a volumetric basis, and d 10 <d 50 <d 90 .