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LANXESS develops Pocan XHR PBT product range

LANXESS develops Pocan XHR PBT product range

Speciality chemicals company LANXESS has developed the new polybutylene terephthalate (PBT) product range Pocan XHR (Xtreme Hydrolysis Resistance). These innovative compounds will be showcased at K 2019, the international trade show for plastics and rubber, in Düsseldorf from October 16 to 23. PBT compounds based on need greater resistance to hydrolysis and ageing in hot and humid environments when used in automobiles.

These new products 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.”
In the SAE/USCAR long-term tests, a finished part is exposed to temperatures from -40 °C to +175 °C (Class 5) at relative air humidities of up to 100 percent in 40 eight-hour cycles. The finished parts then undergo various function tests. The test process is extremely demanding, as heat and humidity affect ageing more intensely when the two factors are combined.

At present, there are four products in the Pocan XHR range. Pocan B3216XHR and B3233XHR have glass fibre contents of 15 and 30 percent respectively and attain Class 5 classification. Pocan TP155-002 is specially tailored for laser transmission welding. The laser-transparent compound with a glass fibre content of 30 percent is suitable, for instance, for resource-efficient production of sophisticated housings for electrical/electronic components, and achieves results between Class 4 and 5 in the USCAR test.
As well as its outstanding hydrolysis resistance, Pocan XHR has other benefits. “For example, its elongation properties and high resistance to alternating temperatures make it suitable for over-moulding of metal parts that are exposed to temperature fluctuations,” Dähling relates.

Pocan XHR is similar to the hydrolysis-stabilized PBT compounds in the Pocan HR series that have become established in many series production applications. Furthermore, flowability is up to 35 percent higher compared with PBT standard products.

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