Criteria for powder testers


In the table the most important capabilities and applications of our Ring Shear Testers are listed in order to provide a comparison of when to use each tester. In addition, you can check whether there is any other powder tester on the market, which provides the same wide area of application as our Ring Shear Testers.

capability / application RST-XS.s RST-XS RST-01.pc RST-01.01 other testers
# 1 # 2
The device is a real shear tester (shear testers are the standard testers in powder technology!). yes yes yes yes    
Measurement of device-independent, well-defined physical properties like unconfined yield strength, internal friction, etc. yes yes yes yes    
Measurement of yield loci with the parameters consolidation stress, unconfined yield strength, internal friction, bulk density, flowability, etc. yes yes yes yes    
Measurement of time consolidation (time yield loci), also known as "caking", with the possibility of long term consolidation of several samples simultaneously (with optional consolidation benches). yes yes yes yes    
Measurement of wall friction (wall yield loci). yes yes yes yes    
Measurement of compressibilty (bulk density in dependence on consolidation stress). yes yes yes yes    
Testing attrition of granules, flakes, and pellets no no yes yes    
"Stress Walk": Measures up top ten points of the flow function on one specimen (for quick assessment of the flow behavior over a wide range of stresses) yes no no no    
Operator-controlled test (test procedure is determined by the operator) yes no no yes    
Variable stress level (stress level adaptable to the application under consideration). yes yes yes yes    
Caking tests (time consolidation) with long-term storage of multiple specimens simultaneously (by use of time consolidation benches) yes yes yes yes    
Measurement also at small normal stresses (down to about 200 Pa). yes yes yes yes    
Measurement also at very small normal stresses (down to about 50 Pa). yes no yes yes    
Shear cells of different dimensions (e.g. small cells if only small powder samples are available). yes yes yes yes    
Limited sample availability (samples < 10 cm3) yes yes no no    
Quick test procedure by running multiple tests on one specimen yes yes yes yes    
Easy operation (e.g. no manual preconsolidation of the specimen). yes yes yes yes    
Computer-controlled, automatic test procedure yes yes yes no    
Software available for the evaluation of the test results. yes yes yes yes    
Large shear deformation possible; therefore also products with extreme elasticity or plasticity can be tested. yes yes yes yes    
Very poor flowing, fine-grained products can be tested (e.g. sewage sludge, carbon black, titanium dioxide). yes yes yes yes    
Testing relatively large particles (> 1..2 mm) no no yes yes    


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Last updated on May 23, 2018.