What is Flexible PCB?

Flexible printed circuit boards, also called Flexible PCBs or Flex PCBs, derive their name for their ability to enable the circuitry to be designed to fit the electronic device or product, as opposed to building the device to conform to the circuit board. Flex boards are characterized by a distinctly patterned printed circuitry and component arrangement highlighted by a malleable base material.

What are Advantages of Flexible PCB?

Flexible printed circuit boards offer a number of potential benefits including:
Saving Space. Flex PCB design requires only about 10 percent of the space and weight of an ordinary circuit board assembly, offering greater installation and packaging freedom. The inherent flexibility also permits tighter bend capabilities.
Maximum Reliability. A flexible printed circuit board requires fewer interconnects, which in turn requires fewer contact crimps, connectors and solder joints. Simply put, a flexible PCB board does not contain as many potential sources for failure, which enhances their reliability.
Enhanced Capabilities. The flexible printed circuits boards are compatible with virtually any type of connector or component and works well with options such as ZIP connectors. They also perform extremely well in extreme temperatures and offer superior resistance to radiation and chemicals.
Cost Savings. Cost-saving advantages of Flexible PCBs include reduced material and packaging demands, lower parts replacement costs and assembly errors that could result in the need for repairs.

Thsse benefits make flex PCBs ideally fit for a wide range of applications in industries such as Military, Transportation, Medical, Consumer Electronics, Automotive, Aerospace, Communications and Industrial.

General specification for Flex/Flex-rigid PCB

Feature Capability
Base material PI 、FR4、 PET Cu
Flexible Insulator PI : 1/2mil(12.5um)to 5mil (127um)
Pet: 1/2mil(12.5um)to 5mil (127um)
Conductor (Copper)
Rolled Annealed (RA)
Electrodeposited (ED))
Thickness: 1/3oz(12um) to 6 oz(200um)
Adhesive Acrylic Adhesive: 1/2mil(12.5um) to 3mil (760um)
Adhesiveness Materials
Solder Mask PI / PET Covered in layers PI and PET film
Resist Oil Solder Mask resist oil )
Stiffener PI PET thickness:0.075-0.3mm
FR4(thickness): 0.2-3mm
Steel thicknes: 0.075-0.5mm
Rigid - Flexible PI+FR4 (thickeness): 3 to 125mil
Surface Finish Tin Immersion Tin
Gold Immersion Gold tickness: 0.025-0.05um
Electrolytic Hard Gold thickness:>0.05um
Silver Immersion Silver
OSP Organic Solerability Preservative
Shielding Black Electromagnetic Film, Required to limit Electromagnetic and/or Electrostatic
Impedance Impedance tolerance:+/-10%
Layers 1to 8 layers(Flexbile,Rigid-Flexible)
Product Size Max. Size:1420*400mm
Min. Size:2.5*2.5mm
Outline tolerance Hand Tirm tolerance:+/-0.2mm
Cutter Dies tolerane:+/-0.2mm
Punch Dies tolerance:+/-0.075mm
Laser Cut tolerance:+/-0.05mm
Min. hole dimension Drilling(P.T.H) Machine Drilling: ¢0.15mm
Laser Drilling: ¢0.05mm
Punching ¢0.50mm
Tolerance of PTH ±0.05mm
Conductor Min. Width (Min. width): 1.5mil    Tolerance:+/-15%
Min. Spacing (Min. Spacing): 1.5mil   Tolerance:+/-15%
Pad Min. Pad: 0.25mm
Stiffener Holes Min. stiffener Holes: 0.2mm
Peeling strength 1.0KGf/CM  0.5KGf/CM 

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