Recently, BASF has added two new hydrolysis-resistant polyamides (PA 66) to its product range. These plastic grades are called Ultramid® A3WG6 HRX and A3WG7 HRX and are reinforced with 30% and 35% glass fibers, respectively. The products were developed for applications in the coolant circuit of vehicles. They are capable of passing the latest, more stringent long-term hydrolysis tests demanded by car manufacturers. Additionally, they also exhibit outstanding heat-ageing resistance in hot air. Sample quantities of these new Ultramid grades are now available. The products are dyed black and can be laser-marked.

The advantages of BASF’s new hydrolysis-resistant PA 66 grades can be seen in the long-term test with radiator end caps that are exposed to hot glycol-water mixtures at a temperature of 130°C [266°F] for over 2000 hours. Whereas the commercially available reference plastic (right hand side) displays numerous cracks, the test part made of Ultramid® A3WG6 HRX (middle of the picture) is much less prone to crack formation. The microscopic images show sections through the parts after the tests. The drawing (on the left) shows the place where the parts were cut.

New: for functionally integrated oil filter modules
Thanks to their property profile, these new plastics lend themselves for more than just radiator end caps and various connectors. In fact, the variant reinforced with 35% glass fibers, Ultramid A3WG7 HRX, can also be used to manufacture oil filter modules having integrated coolant pipes. Today, such components also need to be resistant to hot water and glycol. Tests were conducted with all of the standard water-glycol mixtures.

Tested in hot cooling water: weld line strength and crack formation
BASF developers had a real close look at the weld line strength: the weld line of tanks and caps made of the new A3WG7 HRX grades is much stronger than that of commercially available reference plastics. Tests were carried out on welded containers that had been exposed on one side and on both sides to hot coolant at a temperature of 130°C [266°F]. The new Ultramid grades are considerably less prone to crack formation. This lower tendency to form cracks – a very advantageous aspect for components with weld lines – was also confirmed in the swelling test in pure glycol at high temperatures.

Additional information about BASF’s Ultramid® (PA) is available via the e-mail address Ultraplaste.infopoint@basf.com or by calling phone no.: [+49] (0) 621 60 78780.

About BASF Corporation
BASF Corporation, headquartered in Florham Park, New Jersey, is the North American affiliate of BASF SE, Ludwigshafen, Germany. BASF has more than 15,000 employees in North America, and had sales of approximately $16.4 billion in 2007. For more information about BASF’s North American operations, or to sign up to receive news releases by e-mail, visit www.basf.com/usa.

BASF is the world’s leading chemical company: The Chemical Company. Its portfolio ranges from oil and gas to chemicals, plastics, performance products, agricultural products and fine chemicals. As a reliable partner, BASF helps its customers in virtually all industries to be more successful. With its high-value products and intelligent solutions, BASF plays an important role in finding answers to global challenges, such as climate protection, energy efficiency, nutrition and mobility. BASF has more than 95,000 employees and posted sales of almost €58 billion in 2007. Further information on BASF is available on the Internet at www.basf.com.

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