Patent ID: 8308837

Claim:
An exhaust gas treatment apparatus comprising: an exhaust gas treatment member; and a holding and sealing member twisted around at least one part on an outer circumference surface of the exhaust gas treatment member, wherein the holding and sealing member includes a sheet member which includes inorganic fibers, the sheet member comprising: first and second outer layers; and a center layer, wherein the first outer layer, the center layer, and the second outer layer are laminated with each other such that both the first and the second outer layers are outermost layers, the center layer includes inorganic fibers having a diameter equal to or less than approximately 3 micrometers, the first and the second outer layers include inorganic fibers having a diameter greater than approximately 3 micrometers, and the sheet member further includes a covering layer arranged to be perpendicular to the center layer and directly contact at least a side face of the center layer, said side face facing an inlet or an outlet of the exhaust gas treatment apparatus.