u00b1 2 u00b0 c using the physica mcr301 rheometer equipped with a measuring geometry of cone plate type with a diameter of 5 cm and a 1 u00b0 of angle sold by the company anton paar according to the instructions and the recommendations of the constructor the shear gradient fixed at 5 s u2212 1 is given by the angular speed in rad u00b7 s u2212 1 preferably the powder according to the invention has a flow time determined according to a test b of between 3 and 15 seconds preferably between 4 and 12 seconds and even more preferentially between 5 and 10 seconds the test b consists in determining the time necessary for the flow of 100 0 g of powder according to the method of measurement recommended by the european pharmacopea ep 5 0 volume 1 01 2005 20916 section 2 9 1 6 equipment according to fig2 9 16 2 the powder according to the invention is moreover advantageously characterized by its bulk density and its tapped density determined according to test c corresponding in particular to the method of measurement recommended by the european pharmacopea ep 5 1 volume 1 01 2005 20915 section 2 9 15 equipment according to fig2 9 15 1 and also by its compressibility briefly the test c consists in introducing 100 g of powder into a 250 ml graduated cylinder with a diameter of 35 mm and a height of 335 mm the volume taken up by the 100 g of powder is measured before any tapping volume.