The static angle of repose was measured according to the fixed funnel and free standing cone method [9] . The bulk density of the mixed powders before compression was calculated by determining the Hausner's ratio and Carr's index from the poured and tapped bulk densities of a known weight of sample using a measuring cylinder and the following formula [10],[11] ; Hausner's ratio = D p÷D t , Carr's index= [(D p -D t )÷D p ]×100], where D p (poured density)= weight÷Vp (poured volume), D t (tapped density)= weight ÷V t (tapped volume).