Hard gold PCB

 　　Hard Gold PCB including Full Body and Selective Hard Gold Plating

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　　The Hard Gold surface finish, also known as Hard Electrolytic Gold, is composed of a subcaste of gold with added hardeners for increased continuity, plated over a hedge fleece of nickel using an electrolytic process. Hard gold is extremely durable, so during PCB Fabrication this finish is generally applied to high-wear areas, analogous as edge connector Gold Fingers and keypads, since the hardness of the finish can repel repeated use; still, due to the high cost of hard gold, and its fairly poor solder- capability, it's truly rarely applied to solder-suitable areas.

　　Full Body Hard Gold is generally a rarely- chosen face finish, where the full body of the PCB board is plated with hard gold. In order to apply a Full Body Hard Gold face finish, an electrolytic process using an electric current or an immersion process is demanded, depending on the PCB design. For Complete PCB Assembly systems, where we fabricate and assemble the boards, we will also need to consider the poor solderability of this finish; a truly active flux will be demanded to solder effectively to the hard-gold-plated pad

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