Circuit Boards - Foundation Industries Manufacturing Ltd.
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Circuit Boards contain the membrane circuit, the copper flexible circuit and the PCB.
Membrane Circuit:
At its basic, the membrane circuit is a circuit that has its conductive inks screen-printed onto less-than-1μm-thick base insulating materials. Passive components, such as diodes, transistors, resistors, capacitors, and electrical sensors, are connected to the circuit via wiring. Vacuum evaporation, sputtering deposition, and electroplating are common processes necessary to get the circuit completed. 
Many conductive inks can be used to make a membrane circuit, but most rely on silver as conductive component.
Conductive silver inks are slow-drying liquids that solidify at very low temperatures. Silver tracks can be printed onto flexible substrates, such as PET, PC, PVC, and PU. Benefits of silver circuits include a strong adhesion to the base material, great covering power, and extremely low resistance.
That is why our company independently develops this RoHS-compliant silver ink that has been tested by SGS.  
Typical Applications:
Plenty of applications exist for our membrane circuit, such as in the membrane switch, printed silver circuit board, heating element, flexible circuit, and more. 
Performance Specification:
1. Solids content: ≤60%
2. Flexibility: 2kgs/10 times, size increase<10%
3. Strong adhesion: No silver comes off as the circuit is stretched vertically for 3 times. It is on par with the 3M600 scotch tape.
4. Good printability
5. High electrical conductivity (ohms per square<45MΩ/3μm-120T-300PE mesh)
6. Great hardness 
Copper Flex Circuit:
Copper flex membrane switches offer ideal solutions for devices with complex circuit patterns and very limited real estate, while retaining a low profile.
Copper flex switches are manufactured by laminating a thin sheet of copper to a flexible film substrate.  The copper is then chemically etched away, leaving only copper traces. This etching process is not as environmentally friendly and more expensive than screen printing silver traces.
Single- & double-sided
Polyimide or polyester
Tin, nickel, gold plating
Tighter trace pattern capabilities
Soldered components

Manufacturing capabilities include:
Adhesiveless construction for thinner and more flexible circuits.
Additive processing for higher density circuits. Trace and space capabilities down to .0015" in production.
Microviae sizes down to .001" diameter for high density, 2-layer flex circuits.
Selective plating of gold and tin lead enables multiple attachment methods on the same flexible circuit.
Selective polyimide removal permits cantilevered and windowed leads.
Alternate circuit layer materials such as beryllium copper, stainless steel and cupronickel can be used for optimum performance in unique applications.
SMT and thru hole assembly services. Package sizes down to 0201 & .4mm pitch.
PCB is an interactive printed circuit board editor for Unix, Linux, Windows, and Mac systems. PCB includes a rats nest feature and schematic/netlist import, design rule checking, and can provide industry standard RS-274X (Gerber), NC drill, and centroied data (X-Y data) output for use in the board fabrication and assembly process, as well as photorealistic and design review images. PCB offer high end features such as an autorouter and trace optimizer which can tremendously reduce layout time. For custom requirements, PCB offers a plug-in API for inserting new functionality and using that functionality from within the GUI as well as in scripts.

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Address:No.1, Beian Road, Huang Jiang Town, Dongguan City, Guangdong Province, 523759. Tel:86076981125818 Fax:86076981125819