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 storey density multilayer professional supplier, to provide customers with high-precision high quality Shenzhen board, quality assurance, reasonable prices. Early 20th century to the late 1940s, is the infancy of the PCB substrate material industry. Its development is characterized mainly in: a substrate material resin of this period, the reinforcing material and the insulating substrate in large numbers, technically preliminary exploration. These are the most typical printed circuit board substrate material - the advent and development of CCL, to create the necessary conditions. On the other hand, the metal foil etching method (subtractive method) for the mainstream PCB manufacture circuit manufacturing technology to give the initial establishment and development. It CCL In the constitution, determine the characteristics of the condition, played a decisive role. 

keywords: Species, conductivity, stability,