The characterisation of glidants is important for process control and the design of its processing conditions or handling devices in pharmaceutical industry. Frequently used, fine glidants as Aerosil®, Cab-O-Sil® and magnesium stearate are specific for characterisation of dynamic behaviour. These are complex powder systems, in particular because they contain varying amounts of air that can radically change (influence) their rheology or flow properties. The aim of this work is to describe the dynamic behaviour of the above mentioned sliding substances. Avalanching regions were determined using a dynamic angle of repose measurement method in a rotating transparent drum. Aeration regions and compressibility factors were measured by the FT4 Freeman Technology. The first results showed the change of avalanching regions of all the glidants with the rotation speed of the measuring drum. Tested glidants were included into the aeration regions and their dynamic behaviour was described.Keywords: glidants, rotating drum, dynamic angle of repose, dynamic behaviour
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