Materials testing

Tensile and shear tests

We use a new testing technology to analyze your composite materials and bonded joints. The use of centrifugal force (CAT) technology on the specimen allows the determination of the tensile and shear strength as an absolute physical quantity in N / mm² (MPa).
In addition, fatigue tests with alternating loads and different temperatures can be carried out.
The analysis method can be used for a large number of sample materials from a wide variety of industrial sectors:


  • Joints (Substrate I / Adhesive / Substrate II)
  • Coatings
  • Foils and Films
  • Composite materials

Permeability and Pore size distribution

The method enables for complex characterisation of size exclusion and size dependent permeability of porous materials and has been successfully applied for hollow fibres, flat membranes and microcapsules.
(Woehlecke, H., et al., Journal of Chromatography A, 1995. 708(2): p. 263-271., Dautzenberg, H., et al., Journal of Membrane Science, 1999. 162(1-2): p. 165-171., Bohne, G., et al., Annals of Botany, 2003. 92(2): p. 289-297.)

It is based on permeation of size fractions of a polydisperse polymer solution and analysis by means of high resolution size exclusion chromatography. A dextran probing solution (DPS) with broad continuous molecule size dispersion (Fig.1) is applied to one face of the membrane/capsule.
The DPS modified by permeation/diffusion and the original DPS are chromatographed on a calibrated SEC column and changes in the size dispersion of the retentate or permeate are analysed. The size dispersion functions of both samples are compared by calculation of the quotient q = C/C* at any elution time resp. Stokes' radius. Obtained diagrams of concentration quotients are suitable for evaluation of the membrane cut off and pore size distribution.




a) Microcapsules

Size exclusion curves of 3 differently prepared PEC microcapsules representing the dependence of the distribution ratio y (luminal concentration/external concentration) of dextran size fractions on their Stokes' radius


b) Membranes

Elution diagrams of dextran fractions from modified DPS obtained as retentate and permeate from an ultrafiltration membrane AmiconPM10 in comparison to the original one.


Asphaltene stability and precipitation

The method serves to determine the stability reserve of asphaltene-containing

  • Crude oil
  • Heavy fuel and
  • blends

The test is carried out according to ASTM D7061-17 "Standard Test Method for Measuring n-Heptane Induced Phase Separation of Asphaltene-Containing Heavy Fuel Oils as Separability Number by an Optical Scanning Device".
The phase separation is detected with the photosedimentometer LUMiReader®, which records the temporally and spatially resolved extinction profiles of transmitted light over the entire sample length.
The determined separability number is a measure of the stability reserve of the investigated oil.