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Hard-soft combinations with excellent adhesion

DSM Engineering Plastics (Sittard) : 18 February, 2004  (Technical Article)
Designed to adhere to such hard materials as polycarbonate (PC), acrylonitrile butadiene styrene/Polycarbonate (ABS/PC), and polybutylene terephthalate (PBT), DSM Engineering Plastics
Arnitel TPE has been designed to perform well in automotive airbagcover, instrument panel, and other demanding applications.

Designed to adhere to such hard materials as polycarbonate (PC), acrylonitrile butadiene styrene/Polycarbonate (ABS/PC), and polybutylene terephthalate (PBT), DSM Engineering Plastics Arnitel TPE copolyester elastomer gives manufacturers the freedom to benefit from 2K moulding (multi-component injection moulding processes).

2K moulding provides a flash-free, co-moulded part that eliminates the time and expense involved in additional product handling, tooling, assembly and inventory costs while ensuring high-quality components. A key factor in 2K moulding is the adhesion between the different materials used, and Arnitel TPE is designed to maximise this adhesiveness by fostering interfacial reactions, surface polarity, local interactions, and chain diffusion.

In addition, the processing temperatures and parameters are compatible with common co-moulded materials, enhancing productivity and adhesiveness of Arnitel TPE.

Arnitel TPE excels in airbagcover applications owing to its ductility at -4C and strength at 90C. Low-temperature ductility is required to help prevent injury due to splintering during airbag deployment, while high-temperature strength is required to keep the airbag module in place.

In addition to airbag applications, Arnitel TPE is well-suited for automotive interior components that depend on high aesthetic quality because the material takes an excellent moulded surface finish, as well as offering long-term paint adhesion.

To help customers optimise applications with Arnitel TPE, DSM Engineering Plastics offers global product development, application development, design consulting, as well as access to computer-aided engineering (CAE) tools.

Beyond airbags, Arnitel TPE is extensively used in the automotive industry for applications designed for human touch, such as armrest and steering wheel covers; and those requiring exceptional fatigue resistance and resistance to oil and greases, including rack and pinion bellows, constant velocity joint (CVJ) boots, air-ducts and air brake tubing. In the electronic and consumer goods industry, Arnitel TPE is widely used for mobile phone antennas, cable insulation, flexible tubing, film, dispensers, cable ties, pads, handles, and soft-grip applications. The range of Arnitel TPE is exemplified by its use both in tiny, low-noise gears, and in large, energy- and sound-absorbing railway pads.
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