Paul Heinz
CAS R&D New Applications


Raw materials for pultruded composites with extreme UV, chemical and weathering resistance

Pultrusion is a major manufacturing technology for the continuous production of fiber reinforced plastics with structural shapes. Application areas of semi-finished pultruded parts can be found in various industries ranging from building and construction, through automotive, up to renewable energy.

To fully exploit the advantages of fiber reinforced plastics, it is essential to combine the appropriate fiber with the best possible matrix material. Next to the conventional matrices, like epoxies or unsaturated polyesters, polyurethane materials are constantly gaining importance in the manufacturing of lightweight materials.

Polyurethane materials boast with very high reactivity, tunable processing viscosity and the possibility to construct customized component properties. The resin wets the glass fibers very effectively, forming a very durable, but lightweight composite with high stability and stiffness. The long-term physical properties of current polyurethane matrix systems are impressive for indoor applications which are not facing meteorological influences. However, there are also numerous applications for composites where structural elements are exposed to sunlight or extreme weathering conditions and therefore require protection measures.

To protect fiber-reinforced plastics from a broad variety of environmental influences, Covestro is developing new, cost-optimized processes and products for manufacturing lightweight materials. Desmocomp® is Covestro’s brand new development for fiber reinforced plastics. It is a matrix material based on aliphatic polyurethane and designed primarily for exterior applications. Its excellent weathering and UV resistance protects the composites from environmental influences and displays excellent resistance against chemicals. In addition our new cost optimized processing may open the door to new composite applications based on aliphatic PU matrix.

Although aliphatic polyurethanes are known to have superior weathering characteristics compared to other polymeric resins, in many cases simple substitution of the standard resins by aliphatic polyurethanes can lead to inferior physical properties. There is thus a need for improved formulations designed for the pultrusion process in order to manufacture composites with both, excellent physical properties and excellent weathering stability. Covestro bore this challenge and now is proud to introduce Desmocomp® – a new solution for fiber-reinforced plastics based on aliphatic polyurethane.

Forward-Looking Statements

This presentation may contain forward-looking statements based on current assumptions and forecasts made by Covestro AG. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. These factors include those discussed in Covestro’s public reports, which are available on the Covestro website at The company assumes no liability whatsoever to update these forward-looking statements or to adjust them to future events or developments.

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