and more pliable, and could be compressed. Since the polyolefin material was tacky and lighter than polystyrene, feeding the polyolefin particles into the pipe at high blower and feeder rotational frequencies proved more difficult than polystyrene. The basic premise of this study was to measure the flow of the two materials at the same solid-loading ratios, so the experimental conditions were set to achieve this condition. A 1000 Hz of sampling frequency proved sufficient for the analyses of this work based on Nyquist’s sampling frequency (Dhodapkar, 1991) theorem. This theorem states that the minimum sampling frequency should be twice the maximum frequency of the signal being sampled to avoid aliasing. The number of data points acquired for each run of these experiments was 216.