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Testing the physical properties of powder

  • Comparison of the flowability of bulk materials
  • Quality conformance test and product certification
  • Optimization of flow aids and/or processes
  • Silo calculations according DIN EN 1991-4 or DIN 1055-6
  • Design of the silo geometry
  • Silo stresses in filling and discharge state
  • Time consolidation of bulk materials
  • Ensuring mass flow in a silo
  • Calculation of the minimum outlet opening to avoid bridging
  • Solving problems of existing silos
  • Process control to prevent operating trouble and/or damages
  • Avoid problems at product change
  • Research & development
  • etc.



silo calculations of bulk solids
Silo calculations according to EN 1991-4 or DIN 1055-6 yield loci bulk solid moisture density measurement wall friction


ASTM D6682-01

Take advantage of our thirty years of experience in bulk material analysis. All measurements are performed on standardized and certified instruments in our laboratory. This will give you all parameters necessary for characterization and for further technological calculations.
Structured process procedures ensure a high quality standard and economic workflows.


    angle of internal friction φi, effective angle of friction φe, cohesion, principal stresses σ1, σ2, unconfined compressive strength σc, flowability factor
    + time consolidation (YLT)


    wall friction angle φw, φx, wall friction coefficient μw, adhesion, approximation of wall friction,
    + wall friction time consolidation (WFT)
    + wall friction changing (WFC) ...


    bulk density ρb0, compression density ρb1)


    %M (percent moisture), %S (percent solid), ...

After the measurements, you get the measurement results with the automatically evaluated bulk properties. 


Fail-safe and easy-to-use evaluations ...

Automatic analysis of the measurements and further calculations are available. It is even possible to automatically calculate and compare different silo shapes and dimensions.

  • Statistic analysis for yield loci, wall friction, bulk density

    standard deviation SD, divergence-coefficient (-factor) aK, aμ, aγ

  • σc1) = 

    Flow function, flowability factor

     FL, ffc

  • φe (σ1) =

    Function of the effective friction

  • ρb1) =

    Density function

  • ƒ( φe, ρb, μw, silo geometry ) =

    Silo stress conditions

    Vertical pressure Pv, Horizontal pressure Ph, wall stress Pw for (active) filling state and (passive) discharging state

  • ƒ (φe, μw, silo geometry) =

    Limiting criterion for mass flow

    / funnel flow

  • ƒ( φe, ρb, μw, σc, silo geometry ),


    , critical bridging area, pressure on the outlet

bulk solids measurement data silo geometry bulk material parameter silo hopper filling state mass flow or funnel flow silo hopper discharge state bridging stresses vertical section time consolidation effective angle of friction density funtion fow funticon


The accomplishment of the measurements is up to two weeks, after receipt of the materials. Then, we submit the login data. Then, you may retrieve all the measurements and evaluations, edit or customise them according to your needs, and print or save them.