Our major products

... are Ring Shear Testers (automatic, computer-controlled testers for powder flow analysis, i.e. measurement of flow properties like the flow function, strength, internal friction, wall friction, time consolidation "caking", flowability coefficient) and software for hopper design for flow (following the great work of Andrew W. Jenike).

News and Info


New large Ring Shear Tester

We are proud to present the Ring Shear Tester RST Mk II (image above) which is the successor to model RST-01.pc. It  is upwardly compatible with its predecessor (e.g., usability of the same shear cells). It offers improved design, and is smaller and lighter.

With the tester, the new software RST-CONTROL v3 is delivered.


Small Ring Shear Tester RST-XS.s

The "small" automatic, digitally controlled Ring Shear Tester RST-XS.s for the measurement of flow properties of powders (flowability, caking, wall friction). Automatic, computer-controlled powder testing procedure. Very small specimen volume (standard: only about 30 ml, smallest approx. 3.5 ml).

ff diagram

CAHD - Software for silo design for flow

CAHD: Computer-aided Hopper Design.
An interactive software doing the common calculations according to A. W. Jenike's theory and, if desired, also according to other approaches: Hopper slope for mass flow (diameter-dependent), outlet dimensions to avoid arching and ratholing. The entire process is user-controlled and transparent: Diagrams and extrapolations are finally presented in a comprehensive document.


Small volume shear cell XS-Sr

The shear cell type XS-Sr for Ring Shear Testers RST-XS.s and RST-XS with only 10 ml specimen volume is provided with a lid and bottom ring design similar to the larger shear cells XS-Mr and XS-Lr.


Shear cell and driving axle with reduced heat transfer

This new accessory for the Ring Shear Tester RST-XS.s design supports tests at temperatures deviating from room temperature (reduced heat transfer, increased heat capacity).

Shear cell type M v2

Optimized design of shear cells for large ring shear testers RST-01.pc and RST Mk II

A new generation of shear cells for the large ring shear tester RST-01.pc and its successor RST Mk II offers advantages in terms of cleaning and handling. Available with a sample volume of 900 ml, 200 ml and 48 ml.

Round robin results

Round Robin Test on Ring Shear Testers RST-XS and RST-01.pc

All details and results: Please click here.

Powders and Bulk Solids

Book on powder technology

Powders and bulk solids - Behavior, characterization, storage and flow
(2nd edition 2021)
by Dietmar Schulze (published by Springer)

ASTM Standard D6773

ASTM standard on Ring Shear Tester

D6773: Standard Shear Test Method for Bulk Solids Using the Schulze Ring Shear Tester

Please click to visit the ASTM website.