The material under investigation has been sampled according to DIN EN 932-1 [41] from a 1 m3 flexible intermediate bulk container. Prior to further analysis, the material was dried at 105 °C to an oven-dry state where a constant mass was reached [42]. By doing so, not only a correct particle size distribution (PSD) is obtainable, also the effect of agglomeration during the sieve analysis is minimised.