AUTOMOTIVE | UNDER THE HOOD
Right: Husco variable oil pump control technologies made from SABIC’s Ultem resin
XHR compounds. They are particularly well suited to live components in hot and humid conditions, which have to exhibit good hydrolysis stability and fire resistance at the same time. The flame- retardant compounds are reinforced with glass fibres at 15, 25, and 30wt%, and are also available in unreinforced versions. All materials are equipped with a halogenated FR package and achieve the top classifica- tion of V-0 with low specimen thicknesses, accord- ing to UL 94 flammability tests. The classification is required for many plastic components in batteries of electric and hybrid vehicles, for example. SABIC is collaborating with component supplier Husco to develop next generation automotive applications for Ultem polyetherimide (PEI) resins. Husco has been using unfilled and glass-reinforced grades for 12 years and is now looking to find new solutions for drivetrain and braking systems in future vehicles. Typical applications currently include components for electro-hydraulic control valves in variable valve timing (VVT), variable displacement oil pump control (VDOP) and cylinder de-activation control (CDA), all of which enhance fuel efficiency and vehicle performance. Cam phasing and VVT technologies are low-cost and lightweight and enable engines to maximise performance for specific loads and speeds. VDOP technologies improve efficiency by allowing engines to scale their oil usage in response to driving conditions. Husco has also been developing and producing solenoid valves for a wide range of cylinder deactivation applications. These valves control engine systems that turn specific cylinders on and off in order to maximise efficiency and performance. According to SABIC, the range of Ultem PEI
resins offer elevated temperature resistance, high strength and stiffness and broad chemical resist-
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ance. They provide a good balance between mechanical properties and processability. Key benefits of Ultem resins include: long-term heat resistance up to 180°C; good strength and
stiffness up to 200°C; dimensional stability over a
wide temperature range;
strength retention over long periods; and inherent flame resistance without additives. Husco says that it values Ultem because of its
ease of use in injection moulding and the absence of any requirement for such secondary operations as annealing. Low creep is valuable in applications under virtually constant stress, and it provides freedom for designers to create complicated parts. The company says that it requires precision and micron-level dimensional stability across a broad temperature range that starts at -40°C and goes up to well over +150°C in applications like engine valve components, which need to survive some- times as many as 700m cycles over their lifetimes and constant vibration loads. Ultem is also amor- phous, which reduces impacts from process settings that may be seen with other high tempera- ture rated semi-crystalline materials.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.wittmann-group.com �
www.sumitomo-shi-demag.eu �
www.eurotec-ep.com �
www.teknorapex.com �
www.radicigroup.com �
www.solvay.com �
www.basf.com �
www.tisan.com.tr �
www.avient.com �
www.lanxess.com �
www.sabic.com
IMAGE: SABIC
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