One of the surface finish of PCB, Carbon

There are several surface for PCB, such as OSP, immersion gold, HAL lead-free, gold fingers, etc.
And Carbon is kind of auxiliary surface.
Here we mainly introduce the role of Carbon for PCB.

The introduction and application of carbon.
Carbon is mainly composed of resin, hardener, and carbon powder

The characteristics of carbon.
It is mainly to maintain conductivity and protect the copper surface of the PCB, used for high-reliability membrane switches, keyboards, and other key-type products.

The advantages of carbon.
It provides excellent adhesion and smoothness of the surface