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The expanded grades of Ultradur HR from BASF offer a long service life and an excellent operational reliability of automotive components.
The expanded grades of Ultradur HR from BASF offer a long service life and an excellent operational reliability of automotive components.

BASF has further developed its range of hydrolysis-resistant thermoplastic polyesters to fulfill the growing demand of the automotive industry for highly effective sensors for the expansion of electric mobility and autonomous driving.

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 offered highly resistant polybutylene terephthalate (PBT) materials 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.

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.

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.

Since the market launch, BASF has developed around a dozen HR-modified Ultradur grades, with 15%, 30% and 50% glass-fiber reinforcement. 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.

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