Car manufacturers VW and Audi are to use the polymer Stanyl®, manufactured by DSM, in the fuel-injection system of their new generation of diesel engines. Their supplier Tyco-Electronics has opted to use the DSM polymer Stanyl® in the cabling of the fuel-injection system. Stanyl® is a polyamide 46 developed and patented by DSM that, unlike ordinary nylon, is resistant to high temperatures.
VW and Audi intend to use pump-injector technology in each of the cylinders of the fuel-injection system. This technology produces a higher injection pressure than common-rail systems. The connectors and the couplings in this pump-injector system are made from Stanyl® TW200F3 (15% glass reinforced) in order to ensure reliable connections between the interior and the exterior of the engine.
With operating temperatures in the engine varying between 120°C and 160°C, the polymer used has to have extremely good resistance to engine oil, especially to the particularly aggressive bio-diesel mixture. The polymer must also be resistant to brittleness in these conditions and to corrosion caused by these substances. Thanks to its very high crystallinity Stanyl® is particularly resistant to both engine oil and diesel fuel.
Its very good flow properties also make Stanyl® TW341 a sound choice for use in ducting. The integrated hinge has a bearing function under load and must be able to retain its functionality throughout the life of the engine, including after modifications. Stanyl® TW341 is capable of meeting these extremely high durability requirements.
Rapid crystallization in the mould guarantees high productivity during injection-moulding compared with PA66-UF. Stanyl®'s melting temperature of 295 °C more than allays any concerns about the polymer's ability to withstand injection temperatures above the normal operating temperature.
