Patent ID: 8388899

Claim:
An exhaust gas purifying apparatus comprising: an exhaust gas treating body having a longitudinal direction and comprising: cell walls extending along the longitudinal direction to define cells between the cells; a metal casing having an inner surface and housing said exhaust gas treating body to face the inner surface; a holding sealing material provided between said exhaust gas treating body and the inner surface of said metal casing to hold said exhaust gas treating body in the metal casing, the holding sealing material including an inorganic fiber aggregated body; and said metal casing having a corrosion area at least on a part of the inner surface, the corrosion area comprising a corroded base material of said metal casing; wherein the corrosion area comprises corrosion products which are complicatedly hooked to inorganic fibers forming the holding sealing material; wherein the corrosion products are formed by a corrosive agent which is introduced into the end portion of the holding sealing material; wherein the corrosive agent comprises at least one of an acid solution, an oxidant solution, and a chloride solution; wherein an acid in the acid solution comprises at least one of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, sulfonic acid, acetic acid, formic acid, carbonic acid, and boric acid; wherein an oxidant in the oxidant solution comprises at least one of peroxy acid, hydrogen peroxide, permanganic acid, perchloric acid, hypochlorous acid, and their salts; and wherein a chloride in the chloride solution comprises at least one of chlorides of lithium, sodium, potassium, rubidium, caesium, beryllium, magnesium, calcium, strontium, barium, and radium.