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Trade News  |  9 juillet 2018
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BASF expands portfolio of hydrolysis-resistant polyesters

  • New generation of Ultradur® HR with improved processing and higher flowability
  • First-time orange grade for components in electric vehicles

The demand of the automotive industry for highly effective sensors for the expansion of electric mobility and autonomous driving is increasing. So BASF has further developed its range of hydrolysis-resistant thermoplastic polyesters. The expanded range of Ultradur® HR (HR= hydrolysis resistant) comprises Ultradur® B4330 G6 HR High Speed, a particularly flowable and laser markable grade with 30% glass-fiber reinforcement, Ultradur® B4330 G10 HR, a highly reinforced grade with 50% glass fibers as well as Ultradur® B4331 G6 HR, the next generation with optimized processing characteristics. Ultradur® B4331 G6 HR is available from now on as uncolored grade, in a black laser markable version, and in orange for components in electric cars.

With its Ultradur® HR grades, BASF offers highly resistant PBT materials (PBT= polybutylene terephthalate) which are especially suitable for use in challenging environments. They thus enable a long service life and an excellent operational reliability of automotive components. The HR grades also have a considerably increased resistance to alkaline media which trigger stress corrosion cracking. This is also true of the new Ultradur® B4331 G6 HR grade with considerably improved melt stability and flowability. In tests, Ultradur® B4331 G6 HR does not display any increase in viscosity even with long residence times and at high temperatures - the best basis for stable and easy processing. The material can also be colored in orange (RAL 2003) in order to produce high-voltage plug-in connectors for electric cars. Thanks to the unusually high tracking resistance for PBT, the plug-in connectors can be designed smaller and still withstand the higher voltages in electric vehicles. Thus savings on costs and component weight are possible.

The Ultradur® 4330 G6 HR series which is already available with 30% glass-fiber reinforcement has been expanded to include the particularly flowable and laser-markable Ultradur® B4330 G6 HR High Speed bk15045. With this grade, thin-walled parts and components which show a high ratio of flow path to wall thickness can easily be produced.

The new Ultradur® B4330 G10 HR is filled with 50% glass fibers. It can therefore be processed to components which are simultaneously exposed to moisture and high temperatures (160°C, short term up to 180°C) and keep a high stiffness, e.g. steering modules in the charge air duct. In the temperature range from 140°C to 180°C, the material reaches almost the property level of polyphenylene sulfide (PPS), which is usually employed in this kind of applications.

For selected automotive applications BASF has developed Ultradur® B4450 G5 HR. The PBT is reinforced with 25% glass fibers, RoHS-compliant and flame retardant. It can be colored in light colors and laser-printed. With its low fogging values according to the VDA 278 emission test, it is suitable for applications in car interiors and also for housings of control units. The newly developed material combines hydrolysis resistance with flame retardancy, high tracking resistance and low smoke density. This property profile is also aimed at electric vehicles with their considerable safety requirements and much higher currents than in conventional drive trains.

Since the market launch, BASF has developed around a dozen HR-modified Ultradur® grades, with 15%, 30% and 50% glass-fiber reinforcement, particularly flowable, impact-modified, laser markable, laser transparent or flame-retardant. Typical applications can be found primarily in automotive electronics, e.g. housings of control units, connectors, sensors, but also charging plugs, housings of battery stacks or connectors in the high-voltage circuit of electric cars.

For more information, please contact the Ultraplaste-Infopoint ( or visit


About BASF’s Performance Materials division
BASF’s Performance Materials division encompasses the entire materials know-how of BASF regarding innovative, customized plastics under one roof. Globally active in four major industry sectors – transportation, construction, industrial applications and consumer goods – the division has a strong portfolio of products and services combined with a deep understanding of application-oriented system solutions. Key drivers of profitability and growth are our close collaboration with customers and a clear focus on solutions. Strong capabilities in R&D provide the basis to develop innovative products and applications. In 2017, the Performance Materials division achieved global sales of € 7.7 bn. More information online:


About BASF
At BASF, we create chemistry for a sustainable future. We combine economic success with environmental protection and social responsibility. The more than 115,000 employees in the BASF Group work on contributing to the success of our customers in nearly all sectors and almost every country in the world. Our portfolio is organized into five segments: Chemicals, Performance Products, Functional Materials & Solutions, Agricultural Solutions and Oil & Gas. BASF generated sales of €64.5 billion in 2017. BASF shares are traded on the stock exchanges in Frankfurt (BAS), London (BFA) and Zurich (BAS). Further information at



Dernière mise à jour 9 juillet 2018