AUTOMOTIVE | MATERIALS


property requirements and tailor the new technol- ogy around the overall requirements of the application.


Long-term temperature resistance Lanxess is another supplier that has developed grades of “standard” polyamides that can compete head-on with higher-cost specialities, including PPAs and PPS. Its XTS2 heat stabilisation system for PA66 variants in its Durethan family increases the heat aging durability of the polyamides so much that they reach into the heat deflection temperature range. “Thanks to the new iron-free thermos-stabilisa-


tion, our polyamide 66 variants can withstand temperatures of up to 230°C in the long-term,” says Dr. Thomas Linder, a Durethan material develop- ment expert in the High Performance Materials business unit at Lanxess. The first product from the XTS2 product range, Durethan AKV35XTS2, reinforced with 35% glass, came out last year. There are also plans to offer XTS2 product variants with higher and lower glass fibre contents. Lanxess extensively tested the high long-term


temperature resistance of the new PA66 by conducting hot air aging tests. “Even after 3,000 hours of storage at 230°C, the reduction in tensile stress at break and elastic modulus is barely measurable,” says Linder. The material was mainly designed for high-tech engine applications that are exposed to unusually high temperatures – such as air intake manifolds with integrated charge air coolers or air pipes located near the turbocharger. With one of its most recent developments,DSM


has taken a slightly different route to plugging gaps in the performance/price spectrum. The company, which already offers high temperature polyamides in the form of Stanyl PA46 and ForTii PA4T, as well as regular polyamides 6 and 66, last year launched hydrolysis-resistant grades of Arnite PBT. It says the new ‘HR’ grades come in response


DSM says its new Arnite HR grades of hydrolysis-resistant PBT provide a cost-effective solution in applications exposed to humidity and high temperatures, including automotive connectors, control devices, and sensors


to increasing calls in the automotive market for materials that resist hot and humid environments, for applications that do not necessarily require the outstanding performance of high temperature polyamides. Mark Terlaak, Global Segment Leader, Automo- tive Electronics, adds that PBT scores over standard polyamides for automotive electronic applications because it does not require the use of heat stabilisers and because its lower moisture absorp- tion leads to higher dimensional stability. The new Arnite HR grades are said to stand out


from other PBTs most notably in their higher retention of mechanical properties after USCAR Class 3, 4, and 5 temperature/humidity profile exposure and ‘85/85’ cycles (85°C/85% relative humidity) of up to 3,000 hours. Terlaak says performance at 150°C is “excep-


tional. Our grades will outperform virtually all the competition in terms of flow, speed of crystallisa- tion – which translates into production cycle time – and mechanical property retention over the lifetime of the vehicle.” DSM is launching the new Arnite family with two


Xaloy® The Xaloy®


Polycarbonate


Screw & Barrel Technology Pulsar®


The Xaloy® bimetallic barrel with the Xaloy® X-800® II mixing screw offers best low shear distributive mixing


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barrel inlay provides


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EXTRAORDINARY TECHNOLOGIES FOR TODAY’S PLASTICS


Visit us at PLAST 2018! Hall 13,


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