PCB Circuit Board Processing Solder Mask, Why is The Iink Color Different?
What is PCB Solder Resist?
PCB Solder Resist, also known as PCB Solder Resist, also known as PCB Solder Resist Film in flexible circuit boards, Solder Mask or Solder Resist in English, using green, yellow, red, black, blue and other photographic inks sprayed on the surface of the PCB circuit board.
Why are Different Circuit Board Solder Resist Colors Different?
PCB solder resist can be displayed in different colors, including green, white, blue, black, red, yellow, matte, purple, chrysanthemum, bright green, matte black, matte green and so on. Under normal circumstances, white is the production of LED lighting these products must be used in white PCB circuit boards, other colors are mostly because of the product classification system, each company is different, some use red to indicate the experimental board, some use blue to indicate the focus of the board, some use black to indicate the board used for computer internals.
Does PCB Solder Mask Color Have any Effect on The Board?
In fact, PCB ink has no effect on finished boards. But for the semi-finished products have a great impact, such as green in matte green, solar green, dark green, light green, etc., there is a slight difference in color, the color is too light, it is easy to see that after plugging the holes in the process of the board does not look good, the color is too dark, the ink used by some circuit board factories is not good enough, the resin and the dyestuff ratio is problematic, bubbles and so on, the seriousness of the final curing will be off the ink.
Why Do PCB Circuit Board Solder Mask?
In the printed circuit board (PCB) processing production process, solder resist ink coating is a very critical process. Solder mask on the PCB board's main function is to protect the circuit, to prevent the conductor and other undesirable tin; to prevent electrical shorts between the conductor caused by moisture or chemicals; to prevent the PCB board after the process of production and electrical installation of bad take caused by the circuit breakers; as well as a variety of harsh environments on the PCB board invasion, and so on.
PCB boards on both sides of the copper layer, no solder mask PCB board exposed in the air is easily oxidized, and become defective products, but also affects the electrical properties of the PCB board. Therefore, the PCB circuit board surface must have a layer that can block the PCB and air oxidation reaction of the protective coating, and this layer of coating is covered with solder mask paint material solder mask. Various colors of solder resist paint also came into being, the formation of colorful PCB circuit boards, and solder resist color with the quality of the PCB board and electrical performance does not have any relationship.
PCB board surface also need to weld electronic components, it is necessary to have part of the copper layer exposed to facilitate the welding components, this part of the copper layer is the pad. As mentioned above, the exposed copper layer is susceptible to oxidation, so the pad also needs a protective layer to prevent oxidation; therefore, the emergence of the pad spray plating, that is, we often refer to the PCB surface treatment. Can be plated with inert metal gold or silver, can also be a special chemical film to prevent the copper layer of the pad is exposed to the air is oxidized.
PCB Solder Mask Thickness Standard
PCB solder mask must have good film-forming properties, the thickness of which is a standardized requirement. Currently, most of the circuit board manufacturers in accordance with U.S. civilian standards IPC-SM-840C specification for identification. In this standard in the first level of product solder mask thickness is not limited; 2 level of product solder mask minimum thickness of 10um; 3 level of product minimum thickness should be 18um. Solder mask flame retardant film is usually based on the specification of the U.S. UL agency as a standard, must be through the requirements of the UL94V-0 (UL94 - devices and equipment in the parts of the flammability of plastics with the test).
General requirements of the line in the middle of the position of the weld resistance thickness is generally not less than 10um, the line on both sides of the position is generally not less than 5um, the previous IPC standards have provisions, now no longer seems to make the requirements! Specifically also depends on customer requirements!
Shenzhen Xinchenger Electronics Co., Ltd. is a professional 2-36 layer high frequency PCB circuit board manufacturers, can be expedited production of high frequency PCB boards, mixed pressure high frequency boards, special circuit boards, microwave RF boards, microwave antenna boards, and other products, are widely used in communications equipment, medical electronics, smart home, industrial control, aviation, aerospace and other major fields.
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