2.3.2. Flowability
A plastic funnel with a narrow stem, cut at right angles, was mounted exactly 2 cm above a piece of butter paper positioned on a horizontal table. A sieve with 16-mesh size was fixed to a shaker (100 shakings per minute). Powder sample was placed on the sieve
and allowed to go through the funnel in a fine stream at a controlled speed, so as to form a conical heap. When the top of the powder heap touched the end of funnel stem, the powder stream was stopped by switching off the shaker. The base of the powder heap was outlined with a pencil and powder was removed. After removing the powder, the outlined paper circle was cut and weighed. The radius was calculated and the angle of repose was estimated.