MATERIALS | ENGINEERING THERMOPLASTICS
applications, “for which it is well suited as it features exceptional heat ageing resistance in air at 230°C.” Two grades are currently on offer for injection moulding: 35% glass fibre reinforced (RV350HHR 3800 BK) and 50% glass-fibre filled (RV500HHR 3800 BK). Typical applications for these materials are air suction system components requiring considerable heat resistance. Lanxess says laser transmission welding fits with
the trend toward the miniaturisation of E&E components, with its ability to enable complex geometries to be produced in a cost-efficient and resource-friendly manner. It has just added three new compounds to its already wide range of LT (laser-transparent) grades of Durethan polyamides and Pocan polybutylene terephthalates (PBT). “The new materials possess a range of important
properties that allow them to be used in a broader range of applications,” says Claudia Dähling, an expert in technical plastics at Lanxess. “Potential applications include components for electrified vehicle drives and driver assistance systems as well as devices for the Internet of Things.” Pocan B3233XHRLT is a new 30% glass fibre-
reinforced PBT with “excellent” resistance in a hot and humid environment, as demonstrated in the SAE/USCAR-2 Rev. 6 long-term tests of the Ameri- can Society of Automotive Engineers, says Dähling. “Materials like these are almost unprecedented on the market because standard additives for hydroly- sis stabilisation generally cause the laser transpar- ency of PBT to deteriorate significantly.”
Flame retardancy Most flame retardants also diminish the laser transparency of thermoplastics, Dähling goes on. They are, however, needed for components in battery systems for electric vehicles. “With Durethan BKV30FN04LT, we can offer a corresponding compound based on PA 6,” she says. This uses a
Duranex 750AM is a 30% glass-reinforced, flame-retardant grade PBT
Lanxess has several new laser-transparent polyamides and PBTs
halogen-free flame-retardant package that gives the compound a UL 94 V-0 rating. The material can be safely processed within a stable process window and leaves hardly any deposits in the tool. Its high tracking resistance of 600 V (CTI A, Comparative Tracking Index, IEC 60112) makes it ideal in components for high-voltage batteries and plugs. Pocan TP150-002 is a 30% glass fibre-reinforced
PBT compound exhibiting a laser transmission (980nm) of 13%, which Dähling says is around double the transparency of most other laser-trans- parent PBT product types. Earlier in the year, Polyplastics launched a new
Duranex PBT grade that it says has the outstanding electrical properties traditionally found in PBT, while also offering other important performance attributes. Duranex 750AM is a 30% glass-rein- forced, flame-retardant grade with low warpage, high rigidity, and heat and hydrolysis resistance. It is said to be ideally suited to automotive applica- tions such as communications devices and high- pressure parts for EVs and HEVs. “Until now, it has been difficult to satisfy require- ments for both flame resistance and hydrolysis resistance because hydrolysis resistance typically decreases with the addition of a FR component,” says the company. “There has been an increasing demand for FR materials in the automotive market for use in communication devices and high-pres- sure parts for EVs and HEVs. These materials must also meet the auto industry’s need for high durability and outstanding formability. Duranex 750AM and other PBTs also meet the demands of electrical and electronics applications.” Polyplastics introduced several new ETP grades
at K 2019, including a Duracon acetal (POM) one for fuel pumps, grades with improved slip and wear and, for the first time outside of Asia, an acetal for medical applications.
54 INJECTION WORLD | November/December 2019
www.injectionworld.com
PHOTO: POLYPLASTICS
PHOTO: LANXESS
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