Patent ID: 6960386

Claim:
A holding and sealing mat material of a catalytic converter for purifying an exhaust gas, which is arranged between a catalyst carrier and a shell covering the catalyst carrier from the outside thereof, the holding and sealing mat material, comprising: a fiber material which is formed in a mat shape; and a binder which includes solids constituents and which is attached to the fiber material in an amount of 0.5 to 20% by weight of a whole of the fiber material, wherein a filling bulk density of the holding and sealing mat material after being assembled is within a range between 0.1 and 0.6 g/cm 3 , the fiber material has an upper portion which is adjacent to the shell, a lower portion which is adjacent to the catalyst carrier, and a middle portion which is between the upper portion and the lower portion, each of which is one third of the fiber material in a thickness direction, and the solids constituents in the binder are distributed more in the upper portion and the lower portion than in the middle portion.