Alumina fiber aggregate and catalytic converter support mat comprising the same

摘要

An alumina fiber aggregate which is minimized in scatter of fibers, excels in handling characteristics and working environmental hygiene and finds its useful application to support mats for catalytic converters and such is provided.;An alumina fiber aggregate comprising alumina short fibers having such properties that when diameters of said alumina short fibers are represented by x (μm), the rate at which the natural logarithmic value ln x in lognormal distribution of x is less than ln 3 is not more than 2%, and the value left after deducting from the length-weighted geometric mean of said fiber diameters a value twice its standard error is not more than 6 μm; and a support mat for catalytic converters comprising such an alumina fiber aggregate.