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Multitec® sprayable polyurethane systems have proven their value
Multitec® sprayable polyurethane systems have demonstrated their effectiveness in high-performance, efficient, and environmentally friendly applications. Developed by Bayer MaterialScience in Leverkusen, the Multitec® polyurethane spray system exemplifies how economic and ecological development can go hand in hand rather than being at odds. This versatile liquid system, which can be used with or without glass fiber reinforcement, is ideal for creating parts of various shapes through open or closed molds. The process has proven highly effective in producing molded components, offering a significantly shorter curing time—between 3 to 5 minutes—compared to traditional manual lamination methods. This not only boosts productivity but also eliminates the use of styrene and energy-intensive post-curing processes.
Depending on the application, manufacturers can perform multiple spray operations in succession, whether reinforcing with glass fibers or not, to enhance strength or create a surface that’s ready for coating. These advantages have been widely adopted across many industries. For instance, Pronar Sp. z o.o., an agricultural machinery manufacturer in Narew, Poland, uses Multitec®-reinforced ABS to produce complex-shaped hoods for new tractors. Dr. Marc Schütze, an expert from Bayer MaterialScience, noted, “This example shows how polyurethane spray systems can be effectively used in manufacturing high-quality parts for commercial vehicles.â€
Another application involves Neoplan vehicles, where a glass-reinforced Multitec® staple fiber spray system is used to create anti-drilling molded parts measuring 130 x 95 cm. These lightweight components provide reliable protection for the upper oil pan, preventing debris and rotating particles from causing damage. In the production of bathtubs, the Multitec® system offers a more efficient alternative to traditional manual laminating techniques using unsaturated polyester and chopped fibers. The polyurethane spray system cures quickly, avoids styrene, and adheres well to film substrates, making it a superior choice. Bayer MaterialScience is also developing a new foaming system to expand its capabilities further.
BaySystems® was established in March 2007 as the main brand under which Bayer MaterialScience consolidated its global polyurethane systems business. This includes brands like Baydur® and a network of companies worldwide. More information about BaySystems® can be found online.
Bayer MaterialScience is one of the world's largest polymer producers, with annual sales of €10.16 billion in 2006 (excluding HC Stark and Wolff Walsrode). The company specializes in high-tech polymer materials and innovative solutions for everyday products. Its clients span industries such as automotive, electrical engineering, construction, sports, and leisure. As of the end of 2006, the company operated 30 production sites globally with over 14,900 employees and is part of the Bayer Group.
In addition to its standard systems, Bayer MaterialScience has introduced the Baypreg® polyurethane spray system, which achieves a breakthrough in composite design by producing lightweight, high-rigidity molded parts. This system is used in the production of skis and snowboards, where its sandwich design allows for both rigidity and flexibility. Dr. Marc Schütze explains, “The sandwich structure makes this possible.†Many manufacturers see Baypreg® as a viable replacement for traditional epoxy resins due to its resistance to styrene and compatibility with various core materials like honeycomb structures. It can also be combined with different reinforcing fibers, ensuring full wetting and saturation of the materials.
For example, the Baypreg® system is used to produce double pedals for motorhomes and caravans. These parts are lightweight, impact-resistant, and feature a high-quality surface. The process involves spraying the system into an open mold, where it reacts quickly to form a strong, permanent bond between layers. This technology is also applied in other areas, such as the production of ski equipment, where the combination of polyurethane and natural fibers creates durable and high-performing products.
Another notable application is the use of Bayflex® 180, a mineral fiber-reinforced R-RIM polyurethane material, by Bombardier-Nordtrac OY in Finland. This material is chosen for its high impact resistance at low temperatures and short production cycle, making it ideal for large parts like protective covers for skis. These components are designed to withstand harsh conditions, reducing maintenance costs and improving safety.
In the aerospace and transportation sectors, Bayer MaterialScience’s Blendur® polyurethane resin system is used for high-temperature applications. Harald Rasselnberg, a polyurethane specialist, highlights that Blendur® can withstand temperatures up to 250°C and is suitable for various applications, including structural members, insulation, and casting. Its versatility allows it to replace conventional epoxy and phenolic resins in many industrial settings. The system can be processed using existing thermosetting techniques, making it adaptable to different manufacturing needs.
Overall, Bayer MaterialScience continues to innovate in polyurethane technologies, offering sustainable, high-performance solutions across a wide range of industries. From automotive components to sports equipment and high-temperature applications, their systems consistently deliver value and reliability.