These little boards are made of reinforced glass fiber with epoxy resin. On the outside, the PCB has a layer called the solder mask. It is the solder mask that gives the boards their iconic green color.
With all of the different colors available, why was green chosen to be the standard color? There are a few different reasons why green is the color of most PCBs.
While there are other colors available, motherboards and other key PCBs are almost always green. One reason is that the solder mask used on PCBs is green. The glass epoxy has a natural green tint to it, and many use this color because it is so commonplace.
The color of the board does not affect the efficiency of the board, but it does affect the resolution, which is the precision of the board.
While green boards do not make a difference in how devices work, green solder masks do make a difference. The green solder mask dams better than other colors, at 0. Some believe that the green color was chosen and made standard because of the military. The United States military studied PCB colors and found that green was the most effective color, especially when they tested them in adverse situations. Because of their tests, the military decided that green printed circuit boards would be the norm.
And, the pcb manufacturers who supplied circuit boards to the military had several non-military customers, too. According to research, green is the easiest color for the human eye to see. It is a mixture of red and blue. Because green exists near the middle of the color spectrum at nanometers, the primary colors that make green are easier for the human eye to perceive.
So, when looking at something small and complicated, like a PCB , choosing green makes sense. Different colours can be useful to distinguish different PCBs or to customise them.
ABL Circuits offer coloured printed circuit boards. Green, Blue, Black, Red and White are available for standard production or we can produce bespoke colours or corporate colours as required. You will benefit from the fastest leadtimes in the UK.
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These cookies do not store any personal information. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website. The polymer solution they used in the patent included 3g of dye, but did not describe the color of the dye or why they used it.
When developing an invention for the first time, it seems highly unlikely they would choose the dye or photopolymers because of the military's request or for ergonimic considerations, so we can rule those out. The most plausible explanation is that it was the most accessible, inexpensive and effective materials to be used in fabrication.
For whatever reason, the UV sensitive photopolymers that were effective for this invention happened to be green at the time, and this material's proliferation is most likely due to its low cost. Alternatives do exist these days, and PCBs can be virtually any color.
I know this is all speculation, and I wish I could give a more definitive answer. I've read through patents and papers and Electronic Materials and Processes Handbook , but still haven't nailed it down yet. Maybe a PCB process engineer or researcher can help us here.
However the article states it's based on theories from forum posts and none are proven to be correct. It seems mostly speculative but certainly a few and maybe all would make some sense. The original masks used a base resin that was a "brownish yellow" and a hardener that was a deeper muddy brown.
When they were mixed together they created a honey brown color that apparently not very appetizing. They tried adding red pigments but it became a rusty adobe color and using blue simply made it a darker brown.
None of them were very appealing colors. Since the laminate materials at the time had a green hue they tried adding more yellow and some blue and ended up with an acceptable green color. It became the standard color we are still using today. As a side note, our company like so many others always ordered green solder-mask on PCBs.
When the RoHS directive came along, we began ordering our boards for our RoHS compliant products in blue so that they could be easily identified. It's a little ironic that the "lead-free" boards are the ones that are not "green" :. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
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