Vulkollan® is one of the most powerful elastomers in the market, combining highest mechanical load-bearing characteristics with highest dynamic load-bearing capacity. Therefore, Vulkollan® is preferably used for superior tasks in many technical fields.
In a multistage process developed by Covestro, solid Vulkollan® is produced through chemical reactions between polyester polyols of the high-quality Vulkollan® range, Desmodur 15 and glycols. Desmodur 15 is the trade name for 1,5-naphthylene di-isocyanate (NDI) from Covestro. The ultra-high-performance elastomer covers a hardness range from approximately 65 Shore A up to 60 Shore D. Vulkollan® produces wheels and castors to deal with highest dynamic loads, technical and semi-finished parts.
Cellular Vulkollan® is produced from Vulkollan® polyols, Desmodur 15 and water. It covers a density range from approx. 300 up to 850 kg/m3 and combines high volume compressibility with minimal transverse expansion. Cellular Vulkollan® is used for the manufacture of superior damping elements, such as bumpers, springs, and NVH (noise, vibration, harshness) elements.
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.
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.
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 212°F (100°C). cellular elastomers require temperatures around 194°F (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.
Contact Gallagher to see if Vulkollan® is the best polyurethane elastomer for your application.
