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. The 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.
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