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PCB Silkscreen

The graphics and text on PCB a circuit board is usually printed with a permanent non-conductive epoxy ink. The color is typically WHITE, although other colors may be available. Requirements are addressed in IPC-4781 QUALIFICATION AND PERFORMANCE SPECIFICATION OF PERMANENT, SEMI-PERMANENT AND TEMPORARY LEGEND AND/OR MARKING INKS.

I've never heard of a problem with Silkscreen as a material, except maybe some discoloration after high PCB reflow temperatures for RoHS compliant soldering. Silkscreen problems are almost always caused by circuit board DESIGNERS, so I'm going to take this opportunity to mention a few guidelines (which I will probably repeat in a later section, but worth repeating because designers often do not give silkscreen the attention it deserves!)

If silkscreen epoxy is printed over lands PCB or pads that will be soldered, it will melt into the solder joint during reflow and weaken the attachment. Therefore, silkscreen should always be printed on top of the mask material and never over solderable surfaces. Many CAD systems can clip the silkscreen away from exposed metal, but when creating library components be sure to keep the component outlines and polarity marks away from the pins (0.25mm) by default, and pay attention when moving or rotating reference designators or when adding text to PCB the final board design.

The width of silkscreen graphics can also be a problem. If too thin, PCB the fabricator will have problems in the screening or printing process and skips can occur. If too thick, the text may be too blurry to read. As components get smaller in size and circuit density continues to increase, it is sometimes very difficult to print silkscreen at all, but try to use line widths not less than 0.15 mm (6 mils), 0.18 mm to 0.20 mm is preferred PCB.

Solder pads should never be overprinted, because this may lead to problems during soldering, assembly, and with the E-Test. If we should detect an overprinted solder pad (spacing < 150μm), then Multi-CB reserves the right to remove the marking print at this location. Relevant for the definition of the solder pads is the solder pad exemption. The marking print is usually automatically clipped with a spacing of 100μm to the solder-stop edge.


The spacing between solder pad and marking print should be at least 150μm.

Always avoid overprinting solder pads!

Silk screen printing method
silk_screen.pngproductivityFor high / mass production
Material costCheap
Coating thicknessIt is relatively thick, but it gets scattered
ResolutionBleeding occurred
Silk colorWhite, black, yellow


It is a printing method using a plate material with chemical fibers in a mesh form. By rubbing ink with a squeegee, ink is pushed out between the meshes and printed on the board. For silk printing of printed circuit boards, it is a general construction method.

Inkjet method
Material costExpensive
Coating thicknessIt is thicker but different
Silk colorWhite / Black


This is a printing method that absorbs ink by directly spraying onto a substrate. This is an environmentally friendly method because no sheets or films are used. The print resolution is higher than "screen printing". Inkjet white inks may have a slightly milky "milky" appearance.

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