A mounting mat for an exhaust gas treatment device includes a wet laid sheet of polycrystalline inorganic fibers that have been physically entangled while the wet laid sheet is still in a wet condition. The exhaust gas treatment device includes a housing, a fragile catalyst support structure resiliently mounted within the housing, and the mounting mat disposed in a gap between the housing and the fragile structure. Additionally disclosed are methods of making a mounting mat for an exhaust gas treatment device and for making an exhaust gas treatment device incorporating the mounting mat.

A purification device includes an outer housing canning, extending along a longitudinal axis, and in which exhaust gas is configured to circulate A purification unit is housed in the outer housing canning and incorporates at least one inductive element. An inner induction canning is housed in the outer housing canning and surrounds the purification unit, and comprises an induction device configured to induce an electric current in the at least one inductive element. A holding and insulation assembly is housed in the outer housing canning and surrounds the purification unit. The holding and insulation assembly includes at least one of: an inner holding web positioned radially between the inner induction canning and the purification unit, and/or end rings surrounding the purification unit and positioned on either side of the inner induction canning in a longitudinal direction parallel to the longitudinal axis.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

A mat material used in a sandwiched state between two members. The mat material includes a mat-like body portion having a first surface and a second surface, and an area containing an inorganic adhesive, with the area being formed on at least one of the first or second surface of the body portion, and the inorganic adhesive exhibits adhesiveness upon being heated.

A purification device includes an outer housing canning, extending along a longitudinal axis, and in which exhaust gas is configured to circulate A purification unit is housed in the outer housing canning and incorporates at least one inductive element. An inner induction canning is housed in the outer housing canning and surrounds the purification unit, and comprises an induction device configured to induce an electric current in the at least one inductive element. A holding and insulation assembly is housed in the outer housing canning and surrounds the purification unit. The holding and insulation assembly includes at least one of: an inner holding web positioned radially between the inner induction canning and the purification unit, and/or end rings surrounding the purification unit and positioned on either side of the inner induction canning in a longitudinal direction parallel to the longitudinal axis.

The invention relates to a mounting member for wrapping and mounting a pollution control element in a casing of a pollution control device, the mounting member comprising: inorganic fiber material; and inorganic particles, wherein the inorganic particles are distributed throughout most of the mat and comprise an average diameter of 800 nm to 15000 nm (DV 50), preferably of 1000 nm to 15000 nm (DV 50) measured according to DIN ISO 13320.

A method of treating tough inorganic fiber bundles including opening a plurality of the tough inorganic fiber bundles such that tough inorganic fibers can be dispersed in a liquid slurry to lay down a homogenous fiber aggregate, wherein the tough inorganic fibers have a crush settle volume of greater than 250 ml, optionally greater than 450 ml. Also, a method of treating tough inorganic fiber bundles including dispersing a plurality of the tough inorganic fiber bundles in a slurry with a dilution of about 0.1% to about 2%, optionally about 0.1% to about 1%, effective to lay down a homogenous fiber aggregate, wherein the tough inorganic fibers have a crush settle volume of greater than 250 ml, optionally greater than 450 ml.

The invention relates to a mounting member for wrapping and mounting a pollution control element in a casing of a pollution control device, the mounting member comprising: inorganic fiber material; and inorganic particles, wherein the inorganic particles are distributed throughout most of the mat and comprise an average diameter of 800 nm to 15000 nm (DV 50), preferably of 1000 nm to 15000 nm (DV 50) measured according to DIN ISO 13320.

A fibre mat, for example a monolith support mat or end cone insulator, the mat comprising inorganic fibres having a pressure retained value at 10 minutes at 900 C. of greater than 20 kPa; and preferably a binder. The inorganic fibres comprise X and Y and K.sub.2O, the sum of which is greater than 95 wt. % wherein X is the sum of SiO.sub.2 and ZrO.sub.2 and Y is the sum of Al.sub.2O.sub.3 and La.sub.2O.sub.3, wherein ZrO.sub.2 and La.sub.2O.sub.3 is each present in up to 10 wt. % of the total weight of the inorganic fibres.