Testing of plastic material

Fibre composites or plastics are used in many areas – whether in vehicle construction, industrial products, consumer goods or packaging. We are your contact if you want to get to the bottom of your material. In the more than 30-year history of the company, we have tested or assessed numerous plastic products.


  • Examination of transport boxes from the food production sector
  • Assessment of defective suspensions of children’s swings
  • Testing of gratings for use on platforms
  • Material testing and expert opinions on artificial hip joints
  • and more.

Our services (Selection):

General tests

  • Dynamic Mechanical Analysis (DMA)
  • Dynamic Scanning Analysis (DSC)
  • Ultrasonic measurements
  • Testing the chemical resistance
  • Testing the thermal resistance
  • Static and breaking load testing
  • flow-rate determination
  • scanning electron microscopy

You want to know more? You have special requests? Contact us. We will send you an offer.

Tests according to system standard DIN 24537-3

For the testing of construction elements made of glass-fibre reinforced plastics, the following tests are carried out in conjunction with the system standard DIN 24537-3.

  • Three-point bending test
  • Glass content determination (calcination)
  • Determination of the density

Classifications according to DIN EN 13706

For plastic profiles made of glass-fibre reinforced plastics, we carry out classifications in accordance with DIN EN 13706, for which the following tests are required:

  • Determination of the effective bending modulus in the three-point bending test on the original component according to Annex D, DIN EN 13706-2
  • Determination of the tensile modulus and testing of the tensile strength in the tensile test according to DIN EN ISO 527-4 (test direction axial and transverse)
  • Determination of the bolt load-bearing capacity according to Annex E, DIN EN 13706-2 (test direction axial and transverse)
  • Testing the bending strength in the three-point bending test according to DIN EN ISO 14125 (test direction axial and transverse)
  • Testing of the interlaminar shear strength in the three-point bending test according to DIN EN ISO 14130 (test direction axial)
  • Determination of the textile glass and mineral filler content (calcination method) according to DIN EN ISO 1172 as well as checking and documentation of the layer structure on one of the calcined samples.
  • Checking the conformity of the reaction resins used by FT-IR spectral analysis according to ASTM D 5576
Get in touch with us

Your contact

Team member
Andreas Haacker
Managing Director, Dipl.-Ing.

Andreas Haacker is the director of Siebert + Knipschild. He collected many experiences, in the sector plastic analysis, as an chemical engineer and public appointed and sworn expert for many years.

Feel free to contact by phone 040 688714-0 or E-Mail