Munich — Munich-based chemical Group WACKER, and inpro Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH have developed a silicone adhesive-sealant for mounting vehicle oil pans. Sold under the name ELASTOSIL® RT 779, the new product adheres to both aluminum and polyamide. Plastic oil pans can now be mounted without mechanical fasteners.
ELASTOSIL® RT 779 possesses good sealing properties and is highly resistant to oil, heat and dynamic loads. The adhesive can be applied by machine and rapidly cures at room temperature. Inpro is based in Berlin, Germany, and develops advanced production systems in the automotive industry.
ELASTOSIL® RT 779 is an advance on ELASTOSIL® 76540, a silicone adhesive which was previously used for bonding both polyamide and aluminum oil pans. ELASTOSIL® RT 779 outscores its predecessor in terms of processing properties, storage stability and resistance to hot engine oil under dynamic loads.
This self-adhesive, condensation-curing two-part silicone rubber boasts a balanced range of rheological properties. It has a high green strength, but thins enough under shear to enable it to be readily processed on two-component mixing and metering equipment.
ELASTOSIL® RT 779 also cures rapidly. Even if the container has been in protracted storage, the pot life is just five to ten minutes.
Substantial improvements have also been made to the storage stability of the curing-agent component.
The adhesive-sealant provides very good long-term adhesion to aluminum and polyamide, without the need for priming. Just 20 minutes after mounting, the bond is strong enough to allow further operations on the engine and oil pan. This slashes cycle times in the production process. When fully cured, the adhesive has a bond strength far in excess of 0.25 megapascals. As the area of the adhesive surface is several thousand square millimeters, vehicle oil pans bonded with ELASTOSIL® RT 779 can still support a weight of over 100 kilograms after years of service. ELASTOSIL® RT 779 therefore exceeds all the relevant manufacturing specifications on the mounting of such parts.
As a result of the push to make vehicles lighter, more and more engine oil pans are being made from lightweight materials, such as aluminum and plastic. Until now, such components were bolted to the crankcase. The assembly was then additionally sealed with an adhesive-sealant.
Thanks to the new WACKER product, the oil pan can now be mounted and sealed in one operation. This slashes the time needed for mounting. Compared with conventional mounting methods, far fewer bolted joints and drilled holes are needed for the crankcase.
inpro Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH, headquartered in Berlin, is a joint venture by the companies Daimler, Volkswagen, SABIC, Siemens and Thyssen-Krupp. Its objective is to drive forward innovations in automotive production and to transfer research results to industrial applications. inpro has about 100 employees who are currently working on developments in joining and materials technology, production testing technology, simulation technology and the digital factory.
Plastic oil pans for vehicles weigh much less than their steel counterparts. Thanks to ELASTOSIL® RT 779 silicone adhesive-sealant from WACKER, components like these can be mounted and bonded permanently. The adhesive withstands all the various loads generated during vehicle operation and can be applied fully automatically with a two-component mixing and metering unit.
For further information, please contact:
Wacker Chemie AG
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Tel. +49 89 6279-1601
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The company in brief:
WACKER is a globally-active chemical company with some 16,000 employees and annual sales of around €4.48 billion (2013).
WACKER has a global network of 25 production sites, 21 technical competence centers and 52 sales offices.
Silicone fluids, emulsions, rubber and resins; silanes; pyrogenic silicas; thermoplastic silicone elastomers
Polyvinyl acetates and vinyl acetate copolymers in the form of dispersible polymer powders, dispersions, solid resins and solutions used as binders for construction chemicals, paints and coatings, adhesives, plasters, textiles and nonwovens, as well as for polymeric materials based on renewable resources
Biotech products such as cyclodextrins, cysteine and biologics, as well as fine chemicals and PVAc solid resins
Polysilicon for the semiconductor and photovoltaic industries Siltronic Hyperpure silicon wafers and monocrystals for semiconductor components
Wacker Chemie AG
81737 München, Germany