At present, there are a variety of பிசிபி போர்டு in the market in a dazzling variety of colors. More common PCB board colors are green, black, blue, yellow, purple, red and brown, some manufacturers also creatively developed white, pink and other different colors of PCB.

Different color PCB board introduction

It is generally believed that black PCB seems to be positioned at the high end, while red, yellow and so on are reserved for the low end. Is that true?

In PCB production, the copper layer, whether made by addition or subtraction, ends up with a smooth and unprotected surface. Although the chemical properties of copper is not as active as aluminum, iron, magnesium and so on, but in the condition of water, pure copper and oxygen contact is easily oxidized; Because of the presence of oxygen and water vapor in the air, the surface of pure copper will oxidize quickly upon contact with the air. Because the thickness of copper layer in PCB board is very thin, the oxidized copper will become a bad conductor of electricity, which will greatly damage the electrical performance of the whole PCB.

To prevent copper oxidation, to separate the welded and non-welded parts of the PCB during welding, and to protect the surface of the PCB board, design engineers developed a special coating. This coating can be easily applied to the surface of the PCB board, forming a protective layer of a certain thickness and blocking the contact between copper and air. This layer of coating is called solder blocking and the material used is solder blocking paint.

If it’s called paint, it must be a different color. Yes, raw solder paint can be made colorless and transparent, but PCBS often need to print tiny text on the board for easy maintenance and manufacturing. Transparent solder resistance paint can only show the PCB background, so whether manufacturing, maintenance or sales, the appearance is not good enough. So engineers add a variety of colors to the solder resist paint, resulting in black or red or blue PCBS. However, it is difficult to see the wiring of black PCB, so there will be some difficulties in maintenance.

From this point of view, the PCB board color and PCB quality is no relationship. The difference between black PCB and blue PCB, yellow PCB and other color PCB lies in the color of resistance paint on the final brush. If the PCB is designed and manufactured exactly the same, the color will not have any effect on performance, nor will it have any effect on heat dissipation. As for the black PCB, its surface wiring is almost completely covered, which causes great difficulties to the later maintenance, so it is not very convenient to manufacture and use the color. Therefore, in recent years, people gradually reform, abandon the use of black welding paint, to use dark green, dark brown, dark blue and other welding paint, the purpose is to facilitate manufacturing and maintenance.

Speaking of which, we have basically understood the problem of PCB color. As for the saying that “color represents high grade or low grade”, it is because manufacturers like to use black PCB to manufacture high-end products, and use red, blue, green, yellow and other low-end products.The conclusion is: the product gives color meaning, rather than color gives product meaning.