A holding material including: inorganic fibers that include 70 wt % or more of an alumina component an organic binder other than polyacrylamide of which the surface is negatively charged, alumina sol, and polyacrylamide having a weight-average molecular weight of 3,000,000 to 6,000,000, wherein the amount of the alumina sol is 2 to 8 parts by weight relative to 100 parts by weight of the amount of the inorganic fibers, and the amount of the polyacrylamide is 0.01 to 1.0 parts by weight relative to 100 parts by weight of the amount of the inorganic fibers.

A system for assembling an exhaust after-treatment assembly having a plurality of exhaust after-treatment blocks is described. Each of the plurality of exhaust after-treatment blocks is disposed adjacent to at least one other exhaust after-treatment block. Each exhaust after-treatment block has one or more catalyst substrates. Each catalyst substrate includes a first face, a second face, and a plurality of side faces. The system includes at least one flange member to surround the one or more catalyst substrates about the side faces. The system further includes a locking arrangement including one or more clips on the flange member and a bracket member configured to engage with the one or more clips in the flange members of the adjacent exhaust after-treatment blocks.

A system for assembling an exhaust after-treatment assembly having a plurality of exhaust after-treatment blocks is described. Each of the plurality of exhaust after-treatment blocks is disposed adjacent to at least one other exhaust after-treatment block. Each exhaust after-treatment block has one or more catalyst substrates. Each catalyst substrate includes a first face, a second face, and a plurality of side faces. The system includes at least one flange member to surround the one or more catalyst substrates about the side faces. The system further includes a locking arrangement including one or more clips on the flange member and a bracket member configured to engage with the one or more clips in the flange members of the adjacent exhaust after-treatment blocks.

A honeycomb type heating device includes a pillar-shaped honeycomb substrate having a partition wall defining and forming a plurality of cells and a circumferential wall surrounding the partition wall; a plurality of heaters adjacent to each other arranged on a circumferential surface of a circumferential wall in the circumferential direction of the circumferential surface; a connecting body arranged in the circumferential direction of the circumferential surface and electrically connecting the plurality of heaters; and a metal case housing the honeycomb substrate, the plurality of heaters, and the connecting body. Each heater is a resistance-heating type heater, the cross-sectional area of the connecting body in a cross section perpendicular to the circumferential direction of the circumferential surface is 10.0 to 30.0 mm.sup.2, and the thermal expansion coefficient of the connecting body is higher than the thermal expansion coefficient of the honeycomb substrate by 3.010.sup.6/ C. or more.

An exhaust gas control apparatus for an internal combustion engine includes an outer tube, a downstream side catalyst held in the outer tube via a first mat, and an electric heating catalyst held in the outer tube via a second mat upstream of the downstream side catalyst. A joint of the first mat is disposed in a place other than a vertically lowermost portion.

A retention material for a gas processing device including a processing structure and a casing for accommodating the processing structure, the retention material including inorganic fibers and being arranged between the processing structure and the casing, wherein in a test of repeating a cycle of compressing the retention material until a bulk density of the retention material becomes a prescribed compression bulk density, followed by retaining for 10 seconds, and then releasing until a bulk density of the retention material becomes a release bulk density that is smaller by 12% of said prescribed compression bulk density; a release surface pressure of the retention material after repeating the cycle 2500 times and the compression bulk density of the retention material satisfies the relationship, P17.10D1.62 wherein P is the release surface pressure (N/cm.sup.2) and D is the compression bulk density (g/cm.sup.3).

The invention refers to the use of lubricants in a mounting mat, wherein the mounting mat is made for mounting a pollution control element into a housing, to reduce the cold peak pressure or compression of the mounting mat, the mounting mat comprising: a non-woven mat of inorganic fibers, wherein the lubricants are distributed in the mat, and wherein the lubricants belong to a group consisting of: saturated hydrocarbons (linear and/or branched and/or cyclic, olefinically unsaturated hydrocarbons (linear and/or branched and/or cyclic), fatty alcohols and fatty acids (linear and/or branched and saturated and/or olefinically unsaturated), carboxylic acid esters carbonic acid esters and/or silicone oils and/or organofunctional silanes, silioxanes.

The invention refers to the use of lubricants in a mounting mat, wherein the mounting mat is made for mounting a pollution control element into a housing, to reduce the cold peak pressure or compression of the mounting mat, the mounting mat comprising: a non-woven mat of inorganic fibers, wherein the lubricants are distributed in the mat, and wherein the lubricants belong to a group consisting of: saturated hydrocarbons (linear and/or branched and/or cyclic, olefinically unsaturated hydrocarbons (linear and/or branched and/or cyclic), fatty alcohols and fatty acids (linear and/or branched and saturated and/or olefinically unsaturated), carboxylic acid esters carbonic acid esters and/or silicone oils and/or organofunctional silanes, silioxanes.

An exhaust system includes an exhaust gas treatment article having a porous ceramic honeycomb body mounted in a housing. The housing can be a low expansion housing and includes an outer shell having a first coefficient of thermal expansion (CTE) and an inner wall having a second CTE greater than the first CTE configured to hold the honeycomb body over operating temperatures.

The invention refers to the use of lubricants in a mounting mat, wherein the mounting mat is made for mounting a pollution control element into a housing, to reduce the cold peak pressure or compression of the mounting mat, the mounting mat comprising: a non-woven mat of inorganic fibers, whereinthe lubricants are distributed in the mat, and whereinthe lubricants belong to a group consisting of: saturated hydrocarbons (linear and/or branched and/or cyclic, olefinically unsaturated hydrocarbons (linear and/or branched and/or cyclic), fatty alcohols and fatty acids (linear and/or branched and saturated and/or olefinically unsaturated),carboxylic acid esterscarbonic acid esters and/or silicone oils and/or organofunctional silanes, silioxanes.