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LANXESS unveils new generation of hydrolysis-stabilised PBT compounds
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LANXESS unveils new generation of hydrolysis-stabilised PBT compounds

By October 24, 2019 6:32 pm IST

Compounds based on Polybutylene Terephthalate (PBT) need greater resistance to hydrolysis and aging in hot and humid environments when used in automobiles. For instance, the high electrical power densities of high-voltage systems in electric vehicles lead to greater temperature loads. Furthermore, additional thermal loads arise when charging the battery. In combustion engines, there is a trend towards turbocharged engines, which results in increased temperatures in the engine compartment.

With this in mind, the specialty chemicals company LANXESS has developed the new PBT product range Pocan XHR (Xtreme Hydrolysis Resistance). They have achieved outstanding results in the SAE/USCAR-2 Rev. 6 long-term tests of the American Society of Automotive Engineers (SAE). “In the automotive industry, these tests on the finished part are the absolute benchmark in terms of hydrolysis resistance,” explains Dr. Claudia Dähling, PBT material expert at LANXESS. “In our very strict internal specimen tests, based on the USCAR specification procedure, the new compounds achieve class 4 or even class 5, the two highest gradings. This makes them the material of choice for PBT components, which have to work reliably under the influence of humidity and temperature throughout their service life.”

Strong resistance to caustic soda

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Excellent process-ability

In other respects, with its properties, Pocan XHR is similar to the hydrolysis-stabilised PBT compounds in the Pocan HR series that have become established in many series production applications. In particular, the balanced processing characteristics so valued by the market have been transferred to the new XHR generation. Dähling: “For instance, the melt viscosity at injection-moulding temperatures customary for PBT remains constant for longer, ensuring a reliable production process with a wide processing window.” Furthermore, flow-ability is up to 35 percent higher compared with PBT standard products.

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