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W acker, the Munich-based chemi- cal group, has developed, in collaboration with the society for innovation (INPRO), a new silicone rubber that is specifically designed to meet the demands of the automotive industry.
Elastosil 76540 A/B, a room-temperaturevulcanising RTV-2 liquid silicone rubber, can be easily machine applied, cures at room temperature and has excellent resistance to oil, heat and blow-by gases. It enables plastic oil pans, or sumps, to be assembled inexpensively and creates durable structures.
This RTV, two-part silicone, is extremely robust. Even when immersed in organic liquids, such as engine oil, at over 100ยฐC, the silicone sealant shows hardly any swelling and retains its mechanical strength. Consequently, it bonds extremely reliably and durably to a variety of polymers and metals.
The use of silicone adhesives and fewer screws could reduce the cost of an oil pan by an impressive 25%. According to INPRO, this adhesive offers optimum bond strength and leak-tightness when used with the ideal material combination of aluminium and Ultramid -a polyamide supplied by the BASF chemical group.
INPRO is a joint-venture company that comprises BASF, Daimler, Siemens, ThyssenKrupp, Volkswagen and the Federal State of Berlin.
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