PCB circuit board processing need to prevent finger print

In PCB processing if you do not pay attention, will  accidentally touch the circuit board with your fingers, so easy to cause  PCB circuit board scrapped, because the finger print is sweat, the  composition is some inorganic salt and fat, etc., easy to cause circuit  board no work. Let's take a look at the harms of fingerprints.

1. The naked hand touches the board to cause a chemical reaction on the  copper surface in a very short time, resulting in oxidation of the  copper surface. After a little long time, the fingerprints became  obvious after electroplating, and uneven plating caused Causes serious  defects in product appearance.

2. The naked hand touch board before solder mask will cause the adhesion  of the solder mask to deteriorate, and will blistering and falling off  during hot air solder leveling.

3. In the whole process after the solder masking and before packaging,  touching the surface with naked hands can cause the board surface to be  unclean, resulting in poor solder ability or poor bonding.

4. Grease of the finger print on the surface of the board before silk  wet film or silkscreen and press film, easily cause the adhesion of the  dry/wet film to decrease. Causes plating separation during plating，after  the solder mask is completed, the surface of the board is oxidized and  color different will appear.