Multilayer intumescent sheet

摘要

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.