A subassembly for controlling the mount density of an intumescent mat around a frangible catalyst coated monolith of unknown but varied dimension when the monolith is installed in a catalytic converter, wherein a convolute sleeve of thin intumescent mat from a single piece is wrapped in sufficient layers...http://www.google.de/patents/US4782661?utm_source=gb-gplus-sharePatent US4782661 - Mat support/substrate subassembly and method of making a catalytic converter therewith
