OREANDA-NEWS. One of the leading manufacturers and developers of axial impellers, Denmark-based Multi-Wing International A/S, uses BASF's new long glass fiber-reinforced polyamide Ultramid(r) Structure B3WG10 LFX in the production of the hubs of their new mixed flow fan. These hubs are circular parts fitted on axles or pulleys which then transfer the circular motion to the fans. Fan impellers are used in ventilation, for example in tunnel ventilation systems, engine cooling systems and air-conditioning systems. A new polyamide fiber system provides an improved fiber bonding within the plastics which results in a more stable fiber skeleton structure. The key features of the material are its extremely good weld line strength and creep resistance, particularly at high temperatures, which make it ideal as a substitute for metal.

Axial fans are subjected to high speeds and undesirable natural oscillations and vibrations. Due to its high weld line strength and creep resistance, Ultramid Structure LFX can withstand these extreme stresses and thus provides protection against damage and excessive deformation of the plastic. Its high notched impact strength also means that the material can absorb impact and shock energy at low temperatures down to -30 degrees Celsius without breaking.

The plastic also has good heat resistance. It retains its mechanical properties over a wide range of temperatures and as a result exhibits very good, long-lasting dimensional stability even at elevated temperatures. "In numerous series of tests we have found that the material can withstand extreme centrifugal forces. The stable fiber network makes it ideal for heavy loads and therefore a good alternative to metals in the production of our hubs", explains Victor Silbermann, Development Manager at Multi-Wing. Both, working extremely closely with BASF and the consultation throughout the development phase have also enabled the company to continuously optimize processes and molds.

Ultramid Structure LFX is easy to process and ensures trouble-free production, making it a very versatile material to use. Andre Schafer of Application Development for Engineering Plastics at BASF goes on: "We have optimized the material's properties to such an extent that the plastic has proved a good investment in a number of other applications and current client projects".

The extensive Ultramid Structure LFX portfolio consisting of PA 66 and PA 6 together with specialty polymer grades is available immediately in commercial volumes and with detailed material data.