Press Releases - Wacker Chemie AG


Press Releases

K 2016: 20th International Trade Fair for Plastics and Rubber - WACKER Presents Toluene-free Primer for Silicone Composites

Munich, Jun 28, 2016

WACKER, the Munich-based chemical company, will showcase a new adhesion promoter for silicone rubber at K 2016, the 20th International Trade Fair for Plastics and Rubber. WACKER® Primer G 790 toluene free is used to achieve reliable adhesion between addition-curing silicone rubbers and hard substrates such as aluminum, stainless steel or glass. In comparison with many conventional adhesion promoters, the primer contains no toluene or other aromatic compounds. K 2016 will take place in Düsseldorf, Germany, from October 19 to 26, 2016.

Haftvermittler
At the International Trade Fair for Plastics and Rubber, K 2016, WACKER, the Munich-based chemical company, will showcase for the first time the toluene-free adhesion promoter WACKER® Primer G 790 TF. Tensile tests show that the primer substantially improves the adhesion of liquid silicones to metal, glass or plastic surfaces. The adhesive strength is so good that the bond is permanent.

The adhesion promoter WACKER® Primer G 790 has proven indispensable in many industrial sectors and applications for the pretreatment of metallic and hard non-metallic substrates. It helps to achieve a strong and permanent adhesive bond to liquid silicone rubbers and other addition-curing silicone rubber compounds.

At K 2016, WACKER will launch a further development of the tried and tested adhesion promoter. WACKER® Primer G 790 toluene free has the same adhesion-promoting effect as its predecessor. It is also suitable for pretreating hard substrates such as aluminum, stainless steel, glass, epoxy resin and glass-fiber-reinforced plastic. However, the product differs in terms of the solvent composition. It contains no toluene or other aromatic compounds.

WACKER® Primer G 790 toluene free – a low-viscosity, yellowish solution – contains reactive silicone resins and organic silicates as adhesion-promoting active substances. A mixture of aliphatic hydro-carbons is used as a solvent. The solution is applied in extremely thin layers in a spraying or dipping process, or by brush on to the thoroughly cleaned substrates. Once the solvent has evaporated, the active substances crosslink under exposure to atmospheric moisture and form a silicone resin film that is chemically bonded to the substrate. A silicone rubber compound applied thereafter anchors itself to the film during its curing, resulting in a durable and stable metal, glass or plastic-silicone bond.

The possibility of forming a stable bond is essential when manufacturing two-component products. The substrate primed with the adhesion promoter can be used as the hard component in hard/soft combinations. It can therefore be inserted in the molding tool of an injection-molding machine, for example, and overmolded with a liquid silicone rubber. A sufficiently strong bond between silicone and the hard component can only be established after applying a prime coat.

Visit WACKER at K 2016 in Hall 6, Booth A10.

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Wacker Chemie AG
Media Relations & Information
Florian Degenhart

Tel. +49 89 6279-1601
Email florian.degenhart@wacker.com
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