Single Sided EMI Process

In order to plate electroless copper on the inside (only) of a cabinet, so that the molded plastic substrate needs no other finish, special pretreatment methods have been developed and commercialized. These take the form of catalytic spray paints (Ref 63) that can be applied selectively onto the plastic surface and, following a defined bake or cure step, allow direct deposition of electroless copper. In theory, any of the metals that catalyze electroless deposition may be used; in practice, the choice of metal is a tradeoff of catalytic activity versus cost. Typically, the single-sided EMI process requires no chemical pretreatment other than the paint. Other mechanical steps required include masking of the surfaces not to be plated, drying/baking of the paint, and racking for the plating process.

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