Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 layer multilayer professional providers, to provide customers with high-precision, high Shenzhen circuit board quality, quality assurance, reasonable prices. Production of copper foil if requirements are relatively high, so in the production process. The possibility of the problem is not large, but there are two more serious problem of copper foil, a pinhole (pores) Shenzhen printed circuit board, a surface oxidation, due to the production of CCL are based on copper plating forms Therefore, if the plating solution impure, then it is easy to produce a pinhole Shenzhen printed circuit boards, and copper production of printed circuit board in Shenzhen after a good, if stored properly, would oxidation. With such a foil produced CCL Shenzhen printed circuit board, of course, a grade B board. Glass cloth impregnated with epoxy resin after a rapid warming, followed by rapid cooling of the glass cloth and epoxy resin combined into a cured state, known as prepreg. But the cured state is very unstable, and therefore must be placed in 20 ° about the problem, save, and the shelf life is very short. If you take that expired prepreg to pressure CCL, then out of the course grade plate Section B Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2 -40 layer multilayer professional supplier, to provide customers with high-precision, high-quality circuit board in Shenzhen, quality assurance, reasonable prices. The difference between 4-layer laminates and 6/8 way is by observing the blind hole. Because the graphics card and the motherboard used is 1,4 layer 4-layer alignment, the other layers for other purposes (ground and power). So, with double plate as a guide hole will be pierced board. If some holes in the front panel appears, but on the opposite side is not found, then it must be a 6/8 shelves. If you can find, nature is 4 layers. In multilayer PCB, in addition to the alignment layer, in general, the whole floor will have a direct connection on the ground and the power supply. So we will be classified as such layers power level (Power) or ground plane (Ground). If the parts on the PCB require different power supply, generally have two or more of such PCB power and ground layers. Gold extraction circuit board, Newell Year (online consultation), Shenzhen board is supplied by Shenzhen Electronic Technology Co., Ltd. Newell. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) Guangdong Shenzhen, printed circuit board leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Newell create leadership with the staff warmly welcome all inquiries negotiations to create Newell create a better future.