Dry Bulk Solids: plastics
Flow and physical properties of dry bulk solids for hopper, bin, silo, chute, and conveyor design. Covers grains, aggregates, chemicals, plastics pellets, and biomass. Properties include bulk density (loose/packed), angle of repose, angle of internal friction, Jenike flow factor (ff), Hausner ratio, Carr compressibility index, cohesion class, and moisture sensitivity. Per Jenike Storage and Flow of Solids Bulletin 123, Schulze Powders and Bulk Solids, and CEMA Belt Conveyors.
| material category | material name | angle of internal friction deg (degrees) | angle of repose deg (degrees) | bulk density loose kg m3 (kg/m3) | bulk density packed kg m3 (kg/m3) | carr compressibility index (%) | cohesion class | hausner ratio (dimensionless) | jenike flow factor ff (dimensionless) | moisture sensitivity | notes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| plastics | pe_pellets | 37 | 35 | 530 | 580 | 9 | free_flowing | 1.09 | 5 | low | Polyethylene pellets (HDPE/LLDPE, 3 mm nominal); smooth spherical pellets flow very well |
| plastics | pp_pellets | 37 | 35 | 530 | 580 | 9 | free_flowing | 1.09 | 5 | low | Polypropylene pellets (3 mm nominal); similar to PE; electrostatic buildup may occur in dry conditions |
| plastics | pvc_pellets | 32 | 30 | 1,100 | 1,200 | 9 | free_flowing | 1.09 | 5 | low | PVC compound pellets (3 mm cubes); rigid compound; flows well in pellet form vs powder |
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