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BASF has developed the particle foam based on polyethersulfone.
BASF has developed the particle foam based on polyethersulfone.

After two years of intensive research, BASF is now able to present prototypes of the latest particle foam based on polyethersulfone (PESU). The foam is characterized by its unique combination of properties: high-temperature resistance, inherent flame retardancy, and its extreme light weight coupled with great stiffness and strength.

It is therefore particularly well suited for complex-shaped components in cars, airplanes and trains, which require excellent mechanical properties together with the ability to withstand high operating temperatures or to meet stringent flame-retardant requirements.

The expandable PESU granulate is pre-foamed into beads with low densities between 40 and 120 g/L and can be processed into molded parts with complex 3D geometries using technologies available on the market.

Ultrason E, the PESU of BASF, is an amorphous thermoplastic with a unique temperature profile. It has a high glass transition temperature of 225°C and remains dimensionally stable up to this temperature. Its excellent mechanical and dielectric properties are only slightly dependent on the temperature, too.

Foams made of Ultrason E are approved for use in aircraft. The material, with its exceptionally high limiting oxygen index of 38 (according to ASTM D 2863), distinguishes itself because it meets the requirements for commercial aircraft with regard to combustibility, low heat release and low smoke density (“fire, smoke, toxicity”) even without the addition of flame retardants, which means it is intrinsically flame retardant.

Particle foam for new lightweight components

With regard to the new PESU particle foam, this implies that despite the low density, extremely stiff and strong components can be manufactured that have excellent dimensional stability at high temperatures.

Expanded molded parts made from one single material offer numerous advantages compared to traditional honeycomb structures coated with phenolic resins. They offer considerable flexibility in terms of densities and shapes and therefore greater freedom in design. There are fewer processing steps and therefore lower system costs. Additional functional parts such as inserts and screw threads can be integrated in the complex geometries.

And, last but not least, recycling of the parts can easily be carried out as the polymer is of one single origin. Thanks to such weight-optimized, thermoplastic foams for complex geometries it is possible to realize new lightweight components which, compared to traditional thermoplastic parts, have better properties and are an answer to trends such as e-mobility in automotive construction, the modernization of aircraft cabin interiors and increasing flame retardant requirements in public transport.

Ultrason is the trade name for BASF’s product range of polyethersulfone (Ultrason E), polysulfone (Ultrason S) and polyphenylsulfone (Ultrason P). The high-performance material is used to manufacture lightweight components in the electronics, automotive and aerospace industries, but also in water-filtration membranes and in parts that come into contact with hot water and food. Because of their extraordinary property profile the Ultrason brands can substitute thermosets, metals and ceramics.

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