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 circuit board material specialized supplier base category for providing customers with high precision, high quality Shenzhen board, quality assurance, reasonable prices. The outermost layer of the multilayer solder resist layer, it is what we often say "green oil", although it also can be yellow or other colors. The thickness of the solder resist layer is generally not easy to accurately determine the surface area than there is no copper foil for a slightly thicker area of ??printed circuit board materials manufacturers, but because of lack of foil thickness, so copper still seems more prominent, when we first finger touch the PCB surface can be felt. 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, flexible circuit board material particularity, the price is reasonable. General FR-4 and high Tg difference of FR-4: Yes in the hot state circuit board material, especially in the heat after moisture absorption, the mechanical strength of the material, dimensional stability, adhesion, water absorption, thermal decomposing each case there is a difference, thermal expansion, etc., high Tg significantly better than conventional products PCB substrate material. Circuit board substrate material category, Newell invasive, Shenzhen circuit board material by the Department of Shenzhen-Electronic Technology Limited. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!