US Patent 7318954 Honeycomb structure

There is provided a honeycomb structure 1 having partition walls 2 to form cells 3 extending in the axial direction and having a polygonal section, and an outer wall 4 surrounding the plurality of partition walls 2. The partition walls 2 have an average thickness (Tp) of 0.038 to 0.17 mm. The outer wall 4 has an average thickness (Ts) satisfying a relation of Tp<Ts≦0.7 mm. The outer wall 4 has a concave and convex structure at its outer surface 40. The convex top 7 is located at the outer surface 41 of an abutting portion 5 or the outer surface 42 of abutting portion vicinity 9. The honeycomb structure sufficiently withstands the pressure applied during canning and also has excellent thermal shock resistance.