In this case study, Malvern Panalytical measures aliquots of between 5g and 6g of both coarse and fine coffee to determine whether the achieved measurement reproducibility meets the guidance provided in the International Standards Organisation (ISO) 13320, the international standard for laser diffraction measurements.

The fine grade coffee was chosen for its cohesive nature while the coarser coffee was chosen as it represented a more free-flowing sample.

The fine grade coffee was tumbled and measured out into aliquots of 5g. Due to
its greater polydispersity, the coarser grade was tumbled and then split using a
spinning riffler to provide reproducibly-sampled aliquots of sizes ranging between
5g and 6g.