Ultimate solid and cellular solutions

NDI-based cast polyurethane elastomers

Whenever applications require highest mechanical load-bearing characteristics and highest dynamic load-bearing capacity, NDI-based cast polyurethane elastomers are the material of choice.

Molded part made of Vulkollan®
Molded parts made of Vulkollan®

NDI-based cast polyurethane elastomers can have a solid or a cellular structure. In a multistage process these ultra-high-performance elastomers are produced through chemical reactions between polyols, NDI and glycols or water.

In the first step prepolymers are produced from polyols and NDI. In the second step prepolymers are reacted with glycols (solid elastomers) or water (cellular elastomers) by mixing, and these mixtures are poured into open molds.

Solid elastomers are produced by casting at temperatures exceeding 100 °C, cellular elastomers require temperatures around 90 °C. The reaction mixtures cure in open/closed molds to form solid/cellular elastomers. After demolding, the elastomers are subject to a special maturing process that is essential to achieve exceptional mechanical and dynamic properties.

Besides the classic multistage process, solid and cellular NDI-based cast polyurethane elastomers can also be manufactured from stable NDI-prepolymers offered by Covestro. These products are recommended especially for small- and mid-scale production.

When Desmodur® 15 and Vulkollan® polyols from Covestro are used, the manufactured solid and cellular elastomers can be marketed as Vulkollan®, provided that processing guidelines are implemented and a trademark license is granted by Covestro.

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