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2019-10-11

New compounds from LANXESS for laser transmission welding

  • Hydrolysis-stabilized PBT achieves Class 5 in USCAR test
  • Halogen-free, flame-retardant polyamide 6 with high tracking resistance
  • PBT with very high transmission

Cologne – Laser transmission welding – also known as laser welding – is a method employed for joining plastic parts. It enables even very small components with complex geometries to be produced in a cost-efficient and resource-friendly manner, making it part of the growing trend toward the miniaturization of electrical and electronic functions. This is why LANXESS has developed a wide range of laser-weldable polyamides and polybutylene terephthalates (PBT) Durethan LT and Pocan LT (Laser Transparency) and has recently expanded its range to include three new compounds. At K 2019, the international trade show for plastics and rubber taking place in Düsseldorf from October 16 to 23, the High Performance Materials business unit will be showcasing these innovative compounds. “In addition to good, process-safe laser-weldability, the three new materials possess a range of other important properties that allow them to be used in a broader range of applications,” says Dr. 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 digitalizing the world in which we live: the Internet of Things.”

High hydrolysis stability but still good weldability


Pocan B3233XHRLT (currently Pocan TP155-002) is a new, 30-percent-glass-fiber-reinforced PBT compound that exhibits good laser transparency and an excellent resistance in a hot and humid environment. Materials like these are almost unprecedented on the market because standard additives for hydrolysis stabilization generally cause the laser transparency of PBT to deteriorate significantly. The outstanding hydrolysis resistance of the trial product from the latest Pocan HR generation has been demonstrated in the SAE/USCAR-2 Rev. 6 long-term tests of the American Society of Automotive Engineers (SAE). “This test on the finished part is recognized worldwide as the ultimate test of hydrolysis resistance. In a series of highly stringent, in-house tests conducted on test specimens, our product achieves USCAR test results of between Class 4 and 5 – the two highest classes,” says Dähling.

Flame-retardant and also laser-transparent

Most flame retardants also diminish the laser transparency of thermoplastics, which is why PBT, polyamide 6 and polyamide 66 compounds with good laser-weldability and high flame-retardant properties are rarely seen on the market. They are, however, needed for components in battery systems for electric vehicles. Dähling: “With Durethan BKV30FN04LT, we can offer a corresponding compound based on polyamide 6. With its halogen-free, flame-retardant package, it passes the UL 94 flammability test of the US Underwriters Laboratories Inc. testing organization for small test specimen thicknesses with the top classification of V-0.” 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.

Tailor-made for greater wall thicknesses

The third new LANXESS material for laser welding is Pocan TP150-002. The 30-percent-glass-fiber-reinforced PBT compound is optimized for extremely high laser transparency. It exhibits a transmission of 13 percent, which is around double the transparency of most other laser-transparent PBT product types (measured with a LPKF TMG-3 at 980 nm and a test specimen thickness of 2 mm). “We have tailor-made the material for the cost-efficient laser welding of components requiring a greater wall thickness for design reasons,” says Dähling.

HiAnt – support for every aspect of laser welding

HiAnt is the LANXESS customer support service also for the development of laser-welded components. Services include material-based component design with CAE tools. “We perform simulations to reduce distortion, for example, making the joining process safer and more stable,” says Dähling. The service also encompasses a wide range of component tests performed according to customer standards, including dynamic tests that can also be performed on larger components and, on request, in combination with climate tests. The service also includes technical support for injection molding, welding, sampling and at the start of series production.

Forward-Looking Statements
This company release contains certain forward-looking statements, including assumptions, opinions, expectations and views of the company or cited from third party sources. Various known and unknown risks, uncertainties and other factors could cause the actual results, financial position, development or performance of LANXESS AG to differ materially from the estimations expressed or implied herein. LANXESS AG does not guarantee that the assumptions underlying such forward-looking statements are free from errors nor does it accept any responsibility for the future accuracy of the opinions expressed in this presentation or the actual occurrence of the forecast developments. No representation or warranty (expressed or implied) is made as to, and no reliance should be placed on, any information, estimates, targets and opinions, contained herein, and no liability whatsoever is accepted as to any errors, omissions or misstatements contained herein, and accordingly, no representative of LANXESS AG or any of its affiliated companies or any of such person's officers, directors or employees accept any liability whatsoever arising directly or indirectly from the use of this document.

LANXESS is a leading specialty chemicals company with sales of EUR 7.2 billion in 2018. The company currently has about 15,400 employees in 33 countries and is represented at 60 production sites worldwide. The core business of LANXESS is the development, manufacturing and marketing of chemical intermediates, additives, specialty chemicals and plastics. LANXESS is listed in the leading sustainability indices Dow Jones Sustainability Index (DJSI World and Europe) and FTSE4Good.

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