Metal Core Double Side MC PCB

Metal Core Double Side MC PCB

Layer:10 thickness:1.6mm gold thickness:40um gold finger:printdecircuitboard The surface mostly has three colors: dark green, orange-gold and white. As I understand, the green is resist, the orange-gold is copper, and the white just the silk screen. I find it surprising the color of the...

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Layer:10

thickness:1.6mm

gold thickness:40um

gold finger:printdecircuitboard

The surface mostly has three colors: dark green, orange-gold and white.

As I understand, the green is resist, the orange-gold is copper, and the white just the silk screen.

I find it surprising the color of the PCB's surface copper is quite different to the color of copper pipes. Please compare the orange-gold of PCBs, and the reddish-orange of copper pipes.

Because that board has been gold plated. Ironically, that saves money; copper tarnishes, and would need expensive cleaning immediately before soldering. And gold on the contact fingers makes for reliable connections. Other platings are possible : tin or silver, and formerly lead-based solder. Scrape some green solder-resist off the earth track and you would see a more reddish metal, though it would take a few months to tarnish to the colour of those pipes.


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