AUTOMOTIVE | UNDER THE HOOD
Right: Lanxess has developed a new PBT product range Pocan XHR (Xtreme Hydrolysis Resistance)
“BASF continues its long tradition of developing
particle foams. We started this project in close co-operation with our customer and now we are able to successfully produce various prototypes”, says Daniela Longo-Schedel, Research Engineer. “Thanks to the temperature stability and adjustable mechanical characteristics, the particle foam is suitable for a wide range of applications. Further- more, it can be effortlessly processed on conven- tional EPP-moulding machines as well as with water steam-free technologies. We are working closely together with our customers to finalise the product development.” Lanxess has developed a new polybutylene
terephthalate (PBT) product range: Pocan XHR (Xtreme Hydrolysis Resistance). The company says that compounds based on PBT need greater resistance to hydrolysis and ageing 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. According to Lanxess, the compounds have achieved good results in the SAE/USCAR-2 Rev. 6 long-term tests of the American Society of Automo- tive Engineers (SAE). “In the automotive industry, these tests on the finished part are the absolute benchmark in terms of hydrolysis resistance,” says Claudia Dähling, PBT material expert. “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
Comparison of Lanxess Pocan XHR with HR materials.
under the influence of humidity and temperature throughout their service life.” As well as its good hydrolysis resistance, Pocan XHR has other benefits. For example, its elongation properties and high resistance to alternating temperatures make it suitable for overmoulding of metal parts that are exposed to temperature fluctuations. Further strengths are its improved chemical resistance to substances such as caustic soda, and a much greater long-term temperature stability than standard PBT types, even in dry environments. (For information on Pocan XHR grades for laser welding, see feature on Joining technologies, p31). Lanxess has also developed Durethan TC
(Thermally Conductive), a range of thermally conductive polyamide compounds that will include two PA6 compounds available under the names Durethan BTC67ZH3.0EF (currently available as Durethan TP430-004) and Durethan BTC77ZH3.0EF (currently available as Durethan TP430-003). The
Source: Lanxess 22 INJECTION WORLD | May 2020
www.injectionworld.com
IMAGE: LANXESS
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