Coatings
PCBs are usually finished with solder resist coating and letter print. Apart from that, further coatings with different functions can be applied onto and into the PCB.
  |
Solder resist |
green, blue, red, |
Photo-structurable epoxy coatings |
 |
Solder resist film |
green |
38 μm or 100 μm laminable, photo-structurable |
 |
Screen print |
white, |
Marking print, position print |
 |
Blue mask |
blue, |
Selective, solderable, peelable temporary coating, blue (thick, also known as “blue mask”) or white (thin) |
 |
black |
Alternative to hard gold for push contacts, sliders. Can be used as potentiometer and printed resistors | |
 |
Via fill |
green |
Closing vias with via fill |
 |
Plugging |
opaque |
Via fill with plated, solderable plugs |
 |
Special coatings, adhesives |
various |
Customer-specific requirements on all processible materials |
 |
Coverlay |
orange |
Cover on Kapton/acrylic basis, e.g. for higher electric strength |
