Competition for Rubber Elastomers


Competition for Rubber Elastomers

„Wherever technological life gets tough is where our TPU-X® feels at home.“
M. Hunold

The premium material TPU-X® is deployed anywhere where the highest performance is required. The revolutionary material properties of cross-linked polyurethane (TPU-X®) are what make this new material so unique. High stresses in machine and plant construction become manageable with TPU-X®.

A moulding process patented by Hunold + Knoop has made it possible to considerably simplify and speed up the cross-linking process.

High stresses in machine and plant construction become manageable with TPU-X®.

The advantages of TPU-X®

  • Rubber-elastic properties
  • Enormous dynamic properties
  • Considerably increased life expectancy under extreme conditions
  • Extremely high resilience
  • Very high level of “snappiness”
  • Lower abrasion
  • Continuous working temperature up to +120°C
  • Short-term max. temperature up to +150°C
  • Excellent oscillation and vibration dampening (NVH)
  • Drastically shortened process chain compared to expensive vulcanisation
  • Short cycle times
  • 2K material combinations with other technical plastics and metals
  • Settings from approx. 45°ShA to 74°ShD
  • Oil and grease-resistant
  • Ozone-resistant
  • Odourless
  • Storage stable in contrast to rubber

Areas of application include:

  • Sealing technology
  • Gear wheels (substitution of POM, PA, since more flexible)
  • Rollers, cylinders and spindles for paper transport

The fold test shows the enormous resilience of cross-linked TPU-X® (bottom) and non-crosslinked TPU (middle).


The Vicat softening test shows that TPU-X® (purple) softens considerably later, at about 170°C, than non-cross-linked TPU (blue).


The significantly higher life expectancy of TPU -X® component (turquoise) compared to competitor products from TPU (blue) has been demonstrated in bench tests at a customer.

Examples of products


“The output in our sieving plants has increased by 10-12% with the new TPU-X® sifter balls.  The operating time of the balls even increased 3-4 fold.”

Dipl.-Ing. Heiko Sykorra, Managing Director, Briloner Hartstein Werk GmbH & Co. KG

“TPU-X® offers unbeatable benefits for many applications. Costs are reduced – and higher quality, more resilient parts are produced.  Valuable pioneering work is being performed here by Hunold + Knoop.”

Hans Kampsen, Head of Sales and Techn. Service, Automotive BASF Polyurethanes GmbH, Lemfoerde