Flexible PCBs

The demand for flexible PCBs is increasing in all business segments with especially strong demands from medical and industrial markets.

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Flexible PCBs

What are the available structures for flexible circuit boards?

There are numerous, different structures available. The more common ones are defined below:
Single sided flex (IPC-6013 type 1) Coverlay (polyimide + adhesive) bonded onto an adhesiveless single sided FPC core. With or without stiffeners.
Double sided flex (IPC-6013 type 2) Coverlay bonded onto both sided of an adhesiveless double-sided FPC core (two conductive layers) with plated through holes. With or without stiffeners.
Multilayer flex (IPC-6013 type 3) Coverlay bonded on both sides of an adhesiveless construction containing three or more conductive layers with plated through holes. With or without stiffener. Capability is 6L.


Technical specification

Number of layers

1 – 6 layers

Technology highlights

Mainly polyimide materials, flex PCB’s are necessary when motion of the PCB is needed, when 3-D interconnections are necessary (i.e. replacing cables and connectors) or when these are both combined due to limited available space.


Polyimide, Polyester

Profile method

Laser cutting, punching, rout

Copper weights (finished)

18μm – 70μm

Minimum track and gap

0.075mm / 0.075mm

PCB thickness

0.05mm – 0.80mm

Maxmimum dimensions

450mm x 610mm

Surface finishes available

OSP, ENIG, Immersion tin, Electrolytic gold, Gold fingers

Minimum mechanical drill


FAQ about Flexible PCBs

What is a flexible PCB?

Flexible PCB is a type of circuit board that is made of a flexible material, such as polyimide or polyester, instead of traditional rigid FR-4 material. It allows for greater design freedom and can be bent, folded, and curved to fit into tight spaces.

What are the benefits of using flexible PCBs?

Flexible PCBs have many benefits, including increased design flexibility, reduced weight and size, increased reliability, improved performance, and cost savings compared to traditional rigid PCBs.

What types of applications are suitable for flexible PCBs?

Flexible PCBs are widely used in many applications, including mobile devices, wearable technology, medical devices, and automotive electronics.

What materials are used to make flexible PCBs?

Flexible PCBs are typically made from polyimide or polyester, which are flexible and have good thermal and electrical performance. Other materials, such as polycarbonate, may also be used depending on the specific requirements of the application.

What is the difference between flexible and rigid-flex PCBs?

Flexible PCBs are made entirely of a flexible material, while rigid-flex PCBs are a combination of flexible and rigid PCBs. Rigid-flex PCBs are used in applications where a combination of flexibility and rigidity is required, and they offer the benefits of both flexible and rigid PCBs.


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