AUTOMOTIVE DESIGN 21


Fig. 2. Extruded Elastomer gaskets.


damage or malfunction due to spurious electrical signals has gained importance. A wide choice of shielding materials is available to


design engineers; the main two categories relevant to automotive are moulded and extruded elastomers and form-in-place (FIP) gaskets. Moulded and extruded elastomers can provide an environmental seal with shielding properties. They typically combine an elastomer – usually silicone – with a conductive filler. By using these materials almost any finished shape


can be achieved. Overmoulding the material onto plastic or metal components such as ECU housings is also possible. This provides a one-piece shielded housing that can simplify and speed assembly. Dispensed, electrically conductive FIP gaskets


provide the lowest total cost of ownership for small cross-section and complex pattern applications. Chomerics FIP materials can reduce the installed cost of an EMI gasket by up to 60 per cent. The corrosion resistant nature of FIP materials provides protection against galvanic activity and in many applications eliminates the need for plating or secondary environmental gaskets. n


Enter 21 or ✔ at www.engineerlive.com/ede


Eoin O’Riordan is Marketing & Technology Manager wth Chomerics Europe (a division of Parker Hannifin), High Wycombe, Bucks, UK. www.chomerics.com


Circle 21B or ✔ at www.engineerlive.com/ede


Circle 21A or ✔ at www.engineerlive.com/ede


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