Material strength which generally increases with time and pressure. Factors which affect material strength:

  • Moisture-especially with particles which fuse together with moisture. (i.e. cement, salt, sugar)
  • Particle shape
  • Cohesiveness
  • Static Charge
  • Elastic Springback
  • Cycling of Temperature from hot to cold (see  item 1)
  • Bin Geometry

Factors which can adversely affect flow are:

  • Square corners
  • Simultaneously converging hopper sides
  • Shallow hopper slopes
  • Non-movement of material along walls