Abstract: A multilayer intumescent mat or sheet is useful for mounting a pollution control device or as a firestop. In one aspect, the multilayer intumescent sheet of the invention comprises a non-moldable flexible non-intumescent layer and a non-moldable flexible intumescent layer comprising an intumescent material wherein the layers form a single sheet without the use of auxiliary bonding means. The mat desirably includes a significant proportion of inorganic fiber containing shot, and small proportions of shot-free inorganic fiber and intumescent material. In another aspect, the multilayer intumescent sheet of the invention comprises a first non-moldable intumescent layer comprising a first intumescent material and a second non-moldable intumescent layer comprising a second intumescent material, the first and second intumescent materials being different, wherein the layers form a single sheet without the use of auxiliary bonding means.

Abstract: Catalytic converter or diesel particulate filter or trap having edge protectant which reduces erosion of a lateral edge of an intumescent mounting mat when exposed to hot, impinging gases.

Abstract: The invention provides a multilayer intumescent mat or sheet that is useful as a mounting for a pollution control device or as a firestop. In one aspect, the multilayer intumescent sheet of the invention includes a non-moldable flexible non-intumescent layer and a non-moldable flexible intumescent layer including an intumescent material wherein the layers form a single sheet without the use of auxiliary bonding means. In another aspect, the multilayer intumescent sheet of the invention includes a first non-moldable intumescent layer including a first intumescent material and a second non-moldable intumescent layer comprising a second intumescent material, the first and second intumescent materials being different, wherein the layers form a single sheet without the use of auxiliary bonding means. The invention also provides a pollution control device including a multilayer sheet of the invention disposed between a monolith and a housing.

Abstract: A composite for mounting a catalytic converter or diesel particulate filter. The composite comprises a flexible mat and a layer of an intumescent paste comprising an intumescent material. A catalytic converter element and diesel particulate filter comprising such a composite are also described.

Abstract: The invention provides a catalytic converter or diesel particulate filter comprising: (a) a housing; (b) a catalytic converter element or diesel particulate filter element disposed within said housing; and (c) a flexible intumescent sheet material disposed between said catalytic converter element and said housing; wherein said flexible intumescent sheet material comprises 1 to 70 dry weight percent of at least one unexpanded intumescent material, from greater than 20 to 50 dry weight percent of organic binder, 5 to less than 79 dry weight percent of inorganic binder, and 0 to 70 dry weight percent of one or more fillers.