It is a common problem that powders become aerated during filling into sacks, causing increased volumes, low mechanical stability, bursting of sacks, dusting as air escapes, difficulties in palletizing, and stacking of the pallets. In order to overcome such problems, a pallet press was developed several years ago. The press is used to obtain a more uniform geometry and to get rid of excess air from palletized sacks by simply pressing the pallets into a rectangular shape. How a powder will behave during filling into sacks will depend on its properties. By testing the powders to be stored in this way, one can predict what advantages can be obtained by using the pallet press for specific powders. The applicability of a uniaxial tester, developed for testing flow properties of powders, has been investigated for this purpose by Tel-Tek, POSTEC dept.