Agency / Source: LANXESS

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LANXESS Unveils Double-shell, Welded Motorcycle Tank - Materials for motorcycle tanks need to meet stringent requirements - /
LANXESS Unveils Double-shell, Welded Motorcycle Tank


PRZOOM - /newswire/ - Cologne, North Rhine-Westphalia, Germany, 2020/04/02 - Materials for motorcycle tanks need to meet stringent requirements - / FRA: DE Frankfurt: LXS

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• Powerful barrier effect against gasoline;
• High design flexibility, easy to recycle;
• Good welding properties.

This means, for example, that only very small amounts of fuel should be able to diffuse through the tank walls. The materials need to demonstrate a high level of tenacity and ductility, particularly in the event of a crash, offer high design flexibility for complex tank geometries, and should be cost-effective to process.

BMW Motorrad’s models F 900 R and F 900 XR ( have been able to meet all of these requirements thanks to a single material. The tanks in both machines are made from Durethan BC550Z 900116 DUSXBL by LANXESS. The unreinforced and impact-modified polyamide 6 is injection-molded into two half-shells, which are then welded to form a tank by means of hot plate welding. “Our material comfortably meets the stringent requirements of the United States Environmental Protection Agency (EPA) with regard to permeation. Since it is very easy to process in injection molding, even complex geometries can be produced cost-efficiently. And when it comes to impact loading, this extremely tough material really shows its strengths,” explains Dr. Klaus Küsters, Business Development Manager Blow Molding in the High Performance Materials (HPM) business unit of LANXESS. The tanks are a joint development of BMW Motorrad and Röchling Automotive Italia S.r.l. in collaboration with LANXESS.

Strict EPA limit satisfied
The monolayer solution with polyamide 6 has several advantages over previously used tank materials. The design flexibility and the integration potential of this material are significantly higher in comparison to metals, such as sheet steel and aluminum. There is also no need for costly forming, stamping, and joining steps. Corrosion is also not a factor when polymers are used. Durethan BC550Z 900116 DUSXBL has significantly lower fuel permeation compared to other polymers, such as high density polyethylene (HDPE). Although fluorination can further reduce permeation in HDPE tanks, it is advantageous to avoid this additional manufacturing step due to the costs involved and the chemically aggressive fluorine.

The monolayer solution with polyamide 6 is significantly less expensive than multi-layer systems that contain a highly polar layer, usually made of ethylene vinyl alcohol copolymers, as a permeation barrier.

If the wall thickness is designed accordingly, the permeation values of the monolayer solution are several times lower than the limit of 1.5 grams per square meter of inner surface per day (g/m2∙d) as required by the EPA (Environmental Protection Agency) in EPA 40 CFR.

Perfect weld seams
Durethan BC550Z 900116 DUSXBL was originally developed for the blow molding process and has proved its worth in the series production of fuel tanks over the course of several years now. Due to the increasing number of functions in motorcycles for example, ASC (automatic stability control) the installation space for fuel tanks is becoming increasingly fragmented and complex. These geometries are no longer suitable for the blow molding process. For this reason, for the current BMW Motorrad tanks, two halves are injection-molded and then welded to form the tank. “With the injection molding process, it is not only possible to produce more complex geometries, the wall thickness distribution can also be precisely controlled, which in turn facilitates a more precise tank design using CAE tools,” explains Küsters. The welding properties of polyamide 6 are essential for reliable tank production. “This material is characterized by its excellent welding abilities. Our customers have a wide process window at their disposal to reproducibly create tight weld seams. A weld seam factor of 1 can be achieved easily,” says Frank Krause, expert in plastic welding at LANXESS.

High crash resistance
Another special feature of this material solution is its very high impact resistance. This means that the fuel bladder remains intact and no fuel escapes even in the event of a crash. Pendulum impact tests on aged tanks, for example, do not result in leaks at -20 °C or at 60 °C. Due to its property profile, Durethan BC550Z 900116 DUSXBL is also suitable for tanks for small vehicles, such as quad bikes, snowmobiles, and ride-on mowers, and for gasoline-powered garden tools, such as chainsaws and leaf blowers.


LANXESS ( is a leading specialty chemicals company with sales of EUR 7.2 billion in 2018. The company currently has about 15,500 employees in 33 countries and is represented at 57 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.

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.

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LANXESS Unveils Double-shell, Welded Motorcycle Tank

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BMW Motorrad F 900 R | LANXESS
Contact: Michael Fahrig - 
+49 221 8885 5041 michael.fahrig[.]
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IMPORTANT INFORMATION: Issuance, publication or distribution of this press release in certain jurisdictions could be subject to restrictions. The recipient of this press release is responsible for using this press release and the information herein in accordance with the applicable rules and regulations in the particular jurisdiction. This press release does not constitute an offer or an offering to acquire or subscribe for any LANXESS securities in any jurisdiction including any other companies listed or named in this release.

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