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DSM launches the first hydrolysis resistant polyester for dimension-critical auto parts

News International-French

25 Jun 2013

DSM launches Arnite A-X07455, the first high performance PET (polyethylene terephthalate) engineering plastic that is highly resistant to hydrolysis. This development opens up opportunities for significant weight and cost  benefits over metal in automobile engine compartment applications.

As a result of continuous engine downsizing, particularly in the compact car segment, temperatures under the hood are going up, putting extra demands on plastics components used in this area. On top of this,  identical electronic components are used in vehicles sold and used worldwide, which means they need to  operate under a wide range of temperatur e and humidity conditions. Therefore, there is an increasing  need for materials that retain key properties such as strength, stiffness and impact strength under  demanding hot-humid conditions.

“Injection molded parts from conventional PET lose as much as half of their tensile strength after 1000  hours at 85°C and 85% relative humidity,” says Wouter Gabrielse, Automotive Segment Manager for DSM. “Parts made from DSM’s new hydrolysis resistant Arnite A PET keep around 90% of their initial strength under the same conditions. This was proven in simulated conditions in our laboratory. The performance we have achieved is quite spectacular.”

Arnite A-X07455 enables substitution of metals or higher cost engineering plastics such as polyphthalamides  (PPA) and polyphenylene sulphide (PPS) in automotive parts that require high dimensional accuracy, good  chemical resistance, and very good mechanical properties. It will enable car makers to save costs and improve fuel efficiency through light weighting.

This hydrolysis resistant Arnite A is being targeted at a variety of automotive under-the-hood applications,  including throttle valve bodies, sensors, air control valve housings, electronic throttle control (ETC) and  exhaust gas recirculation (EGR) covers, and ignition sys tems. The new product, apart from being highly  hydrolysis resistant, also exhibits high stiffness, strength and dimensional stability. Arnite A-X07455, which  contains 50% glass reinforcement, has a tensile stress at break of 200 MPa, according to ISO 527.

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