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Flexible PCB Boards

What is flexible PCB? Flexible PCB is flexible printed circuit board using for connecting different hard designs, we also called flexible circuits, Flex PCB or FPCB, Flexible PCB is fabricated by soft material like polymide, the best flexible pcb material is dupont that have low dielectric breakdown.

Flexible pcb circuit board

Flexible pcb circuit board is also called flexible circuit board ( FPC ) for short. It is mainly composed of CU (Copper foil) (ED or RA copper foil), A (Adhesive) (acrylic and epoxy resin thermosetting adhesive) ) And PI (Kapton, Polyimide) (polyimide film) composed of circuit boards have many advantages such as space saving, weight reduction and high flexibility. They are widely used in production and life, and the market is still expanding.

flexible PCB

Flex PCB Capability
Items Type Normal Manufacturing Capability



Inspection Std.

IPC-6013 Class2, IPC-A-600G Class2

Test Std. IPC-TM-650,GB/T4677-2002



AL9111R, AP9121R, AP9131R, AP8525R

Panasonic R-F775 11RB-M, R-F775 22RB-M, R-F775 21RB-M


NDIR050513HJY,IDIR051013HJY,NDIR100520HJY,THK D200520JY

Process capacity

Layers 0-14
Thickness 0.07-4.0mm
Max dimension 10X18 Inch
Min precision Of Dim ±4mil
Min diameter of holes 4mil (Laser drill); 8mil(mechanical drill)
Aspect ratio 10:1

Min trace width/sp ce outer

layer(0.5OZ )


Min trace width/space outer

layer(1OZ )


Min trace width/space outer

layer(2OZ )


Min trace width/space

inner layer(0.5OZ )


Min trace width/space

inner layer(1OZ )


Min trace width/space

wtidth of gridding circr


Min trace width/space

wtidth of out layer

5/5mil(1/3、1/2oz copper);6.5/5mil(1oz copper);

8/5.5mil(2oz copper);

Min distance Between

drilling&conductor(via holes)


Min distance Between

drilling&conductor(compon ent holes)


Min distance Between


&blind holes)


Min ring of inner layer(via


5mil(≤6 Layers) ;8mil(>8Layers)

Min ring of inner

layer(component holes)

8mil(≤6Layers) ;11mil(>8Layers)

The vias to the coalescent location of rigid and flex


HDI board 1+n+1

Surface treatment

Plating Gold(Hard gold) Normal:0.25-0.76um;Hard gold:0.76-2um;



Immersion Tin


Immersion Silver






HASL lead free


Silver ink


Selective surface finishing

ENIG+GOLD Finger; ENIG+HASL; ENIG+OSP; Soft gold+ GOLD Finger; Flash gold+HASL; immersion Tin+gold finger; Immersion sliver+gold finger; OSP +gold finger; Silver ink+Plating gold; Silver ink+ENIG.

Min. bended radius

single side flex 3-6 times the flex thickness

double sides flex

6-10 times the flex thickness

multi-layers flex

10-15 times the flex thickness

dynamic bending

20-40 times the flex thickness

Structure of Flexible pcb circuit board

* CU (Copper foil): E.D. and R.A. copper foil

* Cu copper layer, copper skin is divided into RA, Rolled Annealed Copper and ED, Electrodeposited. The two have different characteristics due to different manufacturing principles. ED copper has low manufacturing cost but is fragile. It is used for Bend (bending) or Driver (drilling). ) When the copper surface is easy to break. RA copper has high manufacturing cost but good flexibility, so Flex PCB copper foil is mainly RA copper.

* A (Adhesive): Acrylic and epoxy resin thermosetting adhesive

* Adhesive is composed of two major systems: Acrylic and Epoxy.

* PI (Kapton): Polyimide (polyimide film)

* PI is the abbreviation of Polyimide, called Kapton in DuPont, and the unit of thickness is 1/1000 inch lmil. The characteristics are thinness, high temperature resistance, strong chemical resistance, and good electrical insulation. The current Flex PCB insulation layer has welding requirements. Kapton.


The characteristics of Flexible pcb circuit board

1. Reduce the size of the application product, save space, greatly reduce the weight, increase the function, and reduce the cost.

2. It is highly flexible and can be wired in three dimensions, and the shape can be changed according to space constraints.

3. Foldable without affecting signal transmission, anti-static interference.

4. High and low temperature resistance, flame resistance.

5. Stable chemical changes, high stability and reliability.

6. Providing more related solutions for related products can reduce assembly man-hours and errors, and increase the service life of related products.

The role of Flexible pcb circuit board

1. The function of the soft board can be divided into four types, namely lead wire, printed circuit, connector and multi-function integrated system

2. Lead wires: connections between rigid printed circuit boards, three-dimensional circuits, movable circuits, and high-density circuits.

3. Printed circuit: high-density thin three-dimensional circuit

4. Connector: low-cost connection between hard boards

5. Multi-function integration system: integration of hard board lead wires and connectors

Application of Flexible pcb circuit board

Flexible pcb circuit boards are widely used in commercial electronic equipment, car dashboards, printers, hard disk drives, floppy drives, fax machines, car mobile phones, general phones, notebook computers, cameras, video cameras, CD-ROMs, Hard disks, watches, computers, cameras, medical equipment and other electronic products and equipment.

How to make flexible PCB board ?
Making Flexible PCB flow chart from multilayer flexible pcb factory, want to know more, welcoem to contact us.


FASTPCBA Service Center

FASTPCBA is Professional 20 Years PCB / PCBA Manufactuer in China, especially more than 80% circuit board are exported to oversea market. We offer 24*7 hours quotation service and engineering support. Offering: 1) PCB Assembly (including Components Sourcing & Testing) 2) Rigid PCB (1~48Layer) 3) Flexible PCB 4) Rigid-flex PCB 5) Aluminum PCB If you have any PCB projects, welcome to contact us. We sincerely hope to cooperate with you.

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