MATERIALS | AUTOMOTIVE


Right: Tensile strength after ageing: Test results have confirmed that 2,000 hours of working temperature at 220°C are perfectly manageable with Solvay’s cost-effective new Technyl Red J high-heat technology for automotive turbo engine components


PA66/6T technology, it is said to flow like PA66, and ensure high chemical resistance and excellent surface aspect. In addition, it is highly suitable for both vibration and hot gas welding, delivering high burst pres- sure resistance levels. Recommended melt and mould temperatures are significantly lower than competitive PA46 or PPA resins.


High-heat polyamides The theme was taken up again at NPE 2018 in Orlando, Florida, in May. Compounder Teknor Apex unveiled a new series of what it calls ultra- high-performance glass-reinforced polyamide 66 compounds that bridge the cost-performance gap between standard engineering thermoplastics and high-heat specialty polymers. It says they provide a more economical alternative to polyphthalamides (PPAs), as well as metal. Creamid TM A3H7.5G Series compounds


provide the strength and stiffness of highly glass- filled engineering polymers while maintaining high levels of critical mechanical properties even after continuous service at temperatures up to 240°C. The materials exhibit greatly improved property retention in comparison with standard, similarly glass-filled PA 66 compounds (see graphs). Their good flow properties make them suitable for thin-wall parts with long flow paths. Creamid A3H7.5G compounds are recommended for under-hood parts in vehicles with turbo-charged engines where long-term high temperature performance is required. The new compounds process at temperatures in


Comparision of various properties of glass fibre-filled PA compounds Source: Teknor Apex


16 INJECTION WORLD | May 2018


the range of 280 to 300°C and with mould tem- peratures of 80 to 110°C. This compares with around 330 to 350°C, and 130 to 150°C, respec- tively, for many PPAs. Products in the new series have glass fibres loading levels up to 60%. Teknor Apex says that, as a custom compounder, it can address specific


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