German chemical giant BASF has announced that it 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 designed for use in challenging environments. According to BASF, the HR grades 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.
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.
Image courtesy of BASF SE.