The Melt Flow Rate (MFR) of hollow glass bead filled polypropylene composites (PP/ HGB) were measured by a melt flow indexer at 230°C under the shear stress of 62.16, 96.70, 143.91 and 206.08 kPa, respectively, and the directed Grey Relational Grade (GRG) between the HGB size distribution and the MFR of the composites was determined by means of Grey Relational Analysis (GRA) in order to investigate the influence of the HGB size distribution on the flow properties of the composites. The results indicated that the particles with a size range from 0.00 to 24.72 μm have a negative effect on the MFR of the composites, while the particles with the size in a range from 24.72 to 256.00 μm have a positive effect, especially for those with a size range from 39.50 to 256.00 μm. That is, the MFR of the composites could be enhanced by decreasing the particle content in the tested fillers with the size in a range from 0.00 to 27.72 μm, while increasing the particles content with a size range from 24.72 to 256.00 μm, especially for those with a size range from 39.50 to 256.00μm.
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