This method is for determining the packed apparent bulk densityof extruded catalysts. The method is applicable to catalystsconforming to the following approximate dimensions: a maximumdiameter of 3.2 mm (1/8 inch) and a maximum average length of 9.5mm (3/8 inch), with a maximum individual length of 15.9 mm (5/8inch). Apparent bulk density, referred to as ABD, is an empiricalvalue defined as weight per unit volume. The packed ABD ofmolecular sieves can be determined using UOP Method 563, �PackedApparent Bulk Density of Molecular Sieves,� which addresses thehydrophilic nature of the material.