Patent ID: 7998422

Claim:
A device for treatment of exhaust gases comprising: a housing; a fragile structure resiliently mounted within said housing; and a substantially non-expanding flexible mounting mat disposed in a gap between said housing and said fragile structure, wherein said mounting mat includes heat treated inorganic fibers having a holding pressure performance-increasing surface treatment thereon comprising an inorganic particulate material on at least a portion of the exterior surfaces of at least a portion of the inorganic fibers; and wherein the mounting mat has a minimum holding pressure for holding the fragile structure within the housing of one of (i) at least 50 kPa after 1000 cycles of testing at a hot face temperature of 300° C., a gap bulk density of between 0.3 and 0.5 g/cm 3 , and a percent gap expansion of 2 percent, and (ii) at least 10 kPa after 1000 cycles of testing at a hot face temperature of 900° C., a gap bulk density of between 0.3 and 0.5 g/cm 3 , and a percent gap expansion of 5 percent.