Patent ID: 7704296

Claim:
A porous ceramic honeycomb body, comprising: a primary cordierite ceramic phase having: a median pore size diameter d 50 less than 7.9 microns; a total porosity % P of at least 50%; a strain tolerance (MOR 25° C. /E 25° C. ) of at least 0.10%; a thermal shock parameter (TSP) of at least 450° C.; and an elastic modulus ratio E ratio of not more than 1.01, wherein TSP is (MOR 25° C. /E 25° C. )(CTE 500-900° C. ) −1 , MOR 25° C. is the modulus of rupture strength at 25° C., E 25° C. is the Young's elastic modulus at 25° C., and CTE 500-900° C. is the high temperature thermal expansion coefficient at 500° C. to 900° C., and E ratio =E 900° C. /E 25° C. where E 900° C. is the elastic modulus at 900° C. measured during heating.