Flex PCB Thickness

  • High-quality flex PCB thickness
  • Various flex PCB thickness is available at any quantity
  • Light, bendy flex PCB
  • 24 hours of flex PCB prototype expedite services

Venture Flex PCB Thickness

Flex PCB Thickness

Venture is a premier manufacturer of Flex PCB in China. We provide a second-to-none and cost-effective solution for maximum frequency PCB needs and requirements. This flex PCB also called as Flex Circuit Board or FCB can be multi-layer just like the usual rigid PCB. You can avail of it at a very cost-effective rate in various thicknesses, features, and capabilities.

Venture flexible printed circuit boards are suitable for any type of component and connector. It works well with options such as ZIP connectors. Venture flexible PCB also offers superior resistance to chemicals and radiation and executes exceptionally in extreme temperatures.

All our Venture Flex PCB products are fully tested and compliant with UL, CE, and ISO9001 for the best of our customers. We are using the exact solution of substrates to develop more the durability of Flex PCB.

When it comes to high-quality Flex PCB products and services, Venture is the right choice.

Venture - Your Premier Flex PCB Supplier in China

Flex PCB thickness

Venture Electronics specialize and focused on the fabrication and assembly of flexible PCB products for use in the production of different kinds of industrial, telecommunication equipment, and medical devices.

Our custom flex PCB manufacturing capabilities enable us to develop and produce a top-performing flex PCB that exceeds your unique requirements.

Venture Flex PCB is also known as FPCB, flex board, flex circuit, flexible printed circuit boards are a patterned arrangement of printed circuitry and material. It`s utilized flexible-based components with or without flexible coverlay. This Venture Flex PCB is constructed from a plastic material that is high performance and flexible. It can be bent or fold or twist during use.

Flex PCB thickness

As a reliable manufacturer, we can design Venture Flex PCB as thin as possible but do not compromise on the quality and functionality of the design. It is available in 0.4mm to 3mm thicknesses, PCB thickness in flex section of 0.05mm to 0.8mm, and maximum dimensions of 457mm to 610mm. The thickness is the greatest determinant of the flexibility of Venture Flex PCB.

Venture Flex PCB is totally useful in various applications and really helpful for design engineers. We, Venture Electronics are willing to support you in choosing the right Flex PCB thickness for your applications. We guaranteed quality from PCB quote to delivery.

Flex PCB thickness

For more than 10 years in this industry, Venture is dedicated and become an expert in manufacturing Flex PCB thickness. This is the perfect place for your flexible PCB requirement. As of now, we are consistently trusted by thousands of electronic engineers worldwide through our 100% quality guaranteed policy.

We aim to be the most professional PCB manufacturer in China for prototyping and low-volume production to work throughout the world. As a professional and most experienced PCB manufacturer, we are committed to meeting the needs of our customers from various industries in terms of quality, cost-effectiveness, delivery, and any other demanding requests.

Whether you need a Sculptured flex circuit board, Rigid-flex PCB, Double-sided flex printed circuit boards, Multi-layer flex circuits, or Single-sided flexible PCB, Venture is your one-stop-shop solution provider ready to fulfill your needs.

For your Venture Flex PCB thickness needs, you can always trust our process. Our 24/7 sales and tech support team and excellent after-sales service can ensure you. Please feel free to contact us anytime.

Flex PCB Thickness: The Ultimate FAQ Guide

Choosing a suitable flex PCB thickness can be an overwhelming task without the right information.

This guide explores everything you need to know about flex PCB thickness.

So, before investing in your next flex PCB, read this guide.

What Are The Various Flex PCB Thicknesses?

Flex PCBs come in a variety of thicknesses depending on their application requirements and configuration.

 Flex PCB

Flex PCB

The various thicknesses include:

Single-Layer Flex Circuit

It consists of a single copper layer fused between a double polyimide layer used for insulation. The Flex core material standard thickness whether in adhesiveless or adhesive structures is usually 0.5-3mm.

The copper thickness ranges from 0.3-2 oz with coverlay of 0.5-2mm of polyimide. They are mostly applied in bend to fit applications.

single layer flex PCB

Single layer flex PCB

Double-sided Flex Circuit

A polyimide layer is placed between two layers of conductive copper with an insulating polyimide layer on the external.

The flex core material has 0.5-4mm as its standard thickness range.

Copper thickness is set at 0.3-2.0 oz and coverlay thickness of 0.5-2.0 mm of acrylic adhesive. Applications include bend to fit structures and impedances found in micro strip configurations.

 double sided flex

double sided flex circuit

Multi-layer Flex Circuit

It is composed of numerous layers (three or more) having layers of insulation between them. Their flex core materials have a standard range of thickness of between 0.5-4.0 mm.

Coverlay thickness stands at 0.5-2.0 mm with a copper thickness range of 0.3-2.0 oz. Its application is usually on bend to fit structures.

multi layer flex circuit

multi layer flex circuit

How Does Minimum Bend Radius Affect the Flex PCB Thickness?

The guidelines on minimum bend radius outline the thickness and level of rigidity of the flexible part of the Flex PCB.

It ensures that the thickness allows an efficient bend that does not affect the circuit and the whole Flex PCB.

Minimum bend radius should be strictly adhered to by designers to create a long lasting and tough Flex PCB.

The minimum bend radius should be exceeded in the end application while maintaining a standard Flex PCB thickness.

This accords the Flex PCB a considerable protection margin while extending its operational lifespan. Minimum bend radius ensures reliable electronics are produced to withstand extreme shock and vibrations efficiently.

What Is The Design Strategy Of Reducing Thickness And Improve Flexibility Of The Flex PCB?

The negative effects brought about by high currents in Flex PCBs can be mitigated by altering several design strategies.

Maximizing the width of the Flex area allows use of thinner copper with wider circuits to carry current.

This reduces the flex thickness, improving the flexibility while reducing the thickness of the coverlay. This enables two-layered designs to have sufficient space on the second layer allowing the splitting of high current lines.

With thinner copper, the high current lines can also be manufactured to run parallel on the two layers.

How Does The Flex PCB Thickness Compare To Its Layer Count?

The number of layers to be used in a Flex PCB have to be put into serious consideration when choosing the PCB thickness.

The thickness of every single layer is directly dependent on the material used and the practical application of the Flex PCB.

Figure 5 flex PCB layer count

The thickness of the Flex PCB is a design concern but manufacturing more layers allows for additional applications on the board.

This means that more devices can be accommodated on a single Flex PCB.

Eventually, the industry standard of “ounce per square foot” must come into play when it comes to each layer thickness.

The regular standard is 1 oz/ft² meaning a total of nine metal layers can be accommodated on a single Flex PCB.

More metal layers can be achieved by fabricating using thinner materials.

However, the disadvantage of this is that the board becomes stiff resembling a plywood in robustness.

What Are The Factors That Affect The Flex PCB Thickness?

Several factors have to be considered when choosing the design thickness for a Flex PCB.

The final design thickness will be greatly impacted by the substrate and material.

Trace PCB Thickness

The final design size of the Flex PCB will be influenced by the thickness of the traces used. The PCB area used for shielding mounting components increase with the use of thicker traces.

Thinner trace thickness is preferred for use in devices that need only a few traces to manufacture.

Design experts have suggested the use of a 5 mil trace in common designs.

The Flex PCB size may also be limited by critical components mounted on it and its power ratings.

A very thick copper PCB may be required if the device contains a very high current rating and containing critical components.

Manufacturing Factors

An appropriate PCB material has to be ordered when the actual Flex PCB is about to be manufactured.

This can be done by using a design manufacturer to supply the materials or personally sourcing them.

The design Manufacturer offers professionals to assist with the design and manufacture. They come up with schematic diagrams and its design specifications which guide the material selection and PCB thickness.

Copper PCB Thickness

The standard thickness for copper PCB in most electronics is normally 8oz.

This thickness will have an impact on the cost of the Flex PCB, its connection flexibility, its final cost and appearance.

Copper is essential in determining the thickness of the PCB because it is the primary application.

Flex PCBs with very high flexibility require thicker copper sizes for their application.

Quality Factors

There are several factors that have to be considered when sourcing for materials to manufacture a Flex PCB.

Some of these factors are purity of the material, harmful substances it contains and if it is biodegradable.

Choosing the right substrate material for the PCB is also key in its design and thickness.

Some devices require thicker substrates when the PCB is mounted in an electrical device thus affecting their thickness.

Design Factors

The design purpose for which the Flex PCB is manufactured determines the its thickness. Large projects require very thick PCBs or additional substrate to strengthen the board and avoid damage.

Smaller projects require thinner boards which cut costs and save time because they are easy to manufacture.

Can A Flex PCB Be Fabricated In Different Thicknesses?

Flex PCBs can be manufactured in variety of thicknesses depending on the product requirements.

They can either be single or double sided, multilayered or made with through hole technology.

The standard Flex PCB single layer thicknesses from 0.4mm to 1.6mm made in steps of 0.2mm.

Multi-layered Flex PCBs have a standard 1.6mm thickness with sizes ranging from 0.5mm-3.2mm.

What is The Smallest and Largest Flex PCB Thickness Size That Can be Fabricated?

Flex PCBs can be manufactured in a variety of thicknesses based on customer requirements and intended purpose.

The smallest PCB that can be made is 5mm square which is mostly applied in medical devices.

Factors like product size, technology used in manufacture and the components to be mounted with their weight affect the size.

The largest PCB that can be fabricated is 450mm by 300mm with a useable area of about 17” by 11”.

This can be made larger by producing it in parts then assembling it. This is in order for it to fit directly in the panel of its intended purpose.

How Does Placing Flex Layers In The Stack-up Center Affect Thickness Of The Flex PCB?

Flex PCBs containing multiple layers with intricate structures require a stack up view of materials to simplify their requirements.

Placing the Flex layers in the stack up details the material thickness more efficiently.

Because of their exposures and cutaways, these complex Flex PCBs need a view from the sectional area. This is mostly when the materials all through the board are not uniform.

What Is The Cost Impact of The Layer Count On a Flex PCB?

The higher the layer count on a Flex PCB, the higher its cost rises. This is a major factor that distinctively determines the price of the PCB.

Such increase in price is also affected by the materials the manufacturer uses.

Adding a second layer and subsequent layer means the number of production processes is increased. The more layers a Flex PCB has, the more the resources and time needed to completely finish the manufacturing process.

What Is The Standard Thickness Of A Two-layer and Four-layer PCB?

Flex PCB boards are manufactured in a variety of thicknesses.  The minimum thickness of a standard two-layer board is usually 14mm with a maximum of 32mm.

Both layers on the PCB have the minimum thickness which must be maintained after establishing the PCBs total thickness.

They can be referred to as short-run PCBs and are readily available from various electronic designers.

A Flex PCB with a 32mm board thickness is preferred for use in four layer PCBs.

The board thickness is determined by the number of layers required to achieve the design goal.

The four layered 32mm thickness PCB contains three solid layers together with a ground plane.

The ground plane can be milled off during the PCB assembly or etched away to reduce the thicknes

How Does Putting Rigid Sections With Varying Thickness Affect the Flex PCB Performance?

Flex PCB designers have the design freedom to manufacture the flex boards can accommodate rigid boards containing different layers.

However, all the sections that are rigid should be of the same thickness.

When it is unavoidably necessary for a Flex PCB to have rigid sections with varying thicknesses, its manufacturing becomes harder.

This may force the manufacturer to fabricate the part using a process called “pouch”.

The design technicians are best suited to give advice if hard boards of varying thicknesses need to be used in Flex PCB design.

What Are The Factors To Consider When Choosing The Correct Thickness For A Flex PCB?

The Flex PCB prototype majorly determines its thickness and any other design considerations required. A board thickness calculator also comes in handy when determining the correct board thickness to use.

The factors considered in choosing board thickness include:


A wide variety of Flex PCBs are usually 1 oz/ft².

Increasing the board’s thickness tends reduce its flexibility as much as it necessitates a variety of functions with additional components mounted.

A flat Flex PCB has a standard thickness range of 0.3-0.45 oz/ft².

Their flexibility is not as good as ultra-thin PCB material but they can still bend without breaking or a fracture.

Board Weight

The final Flex PCB board weight is greatly influenced by the materials used on the board.

Thinner materials may be lighter and cheaper but they interfere with some assemblies and component mounting.

This tends to have an adverse impact especially on the boards electrical characteristics. The board may be damaged in case of overheating.

Electrical Performance

The electrical performance of a Flex PCB is affected when it is too thick.

This occurs when the traces are placed too close to each other hence their inductance or impedance affect each other.

A thin board ensures efficient connections between components and the traces.

It can however just support a limited number of parts compared to a thicker Flex PCB.


The cost of materials used in the Flex PCB manufacture will determine its final cost.

More layers mean additional board thickness which increase the eventual cost per square foot.


More power is required to run a very thick Flex PCB and a different power supply may be required.

The current needed to support all components require the power supply to work harder to generate it.

What Thickness Level Can a Flex PCB Have at Its Flexible Bends?

Several problems occur during sharp bending of Flex PCB circuits such as wrinkles caused by compression.

The bend radius has to be established first during design.

The PCB can perform efficiently with a bend radius that is at least ten times thicker than the PCB material.

Reducing the flex bend copper weight also improves its performance.

Is It Recommended To Use Thicker Prepreg Layers To Join The Coverlays In Flex PCBs?

The total thickness of the prepreg layers used in joining the coverlays should exceed the coverlay thickness by a 2-3mm.

This makes it easier and enhances the boards flexibility because 2mm of coverlay needs 3-4mm of prepreg.

Do S Curves In The FLEX PCB Help With Flexibility?

The S curve greatly enhances the flexibility of the Flex PCB. Besides assisting in Flexibility, they also decrease the chances of traces cracking.

Traces placed opposite each other also assist in this.

What Are The Methods Used To Measure The Thickness of Flex PCB?

There are three ways in which the Flex PCB thickness can be measured:


Thickness measurement using a micrometer are either done on the test panel or on the board before and after coating.

The uncoated measurement is taken and the and the cured coating thickness subtracted from it.

The result is divided by two giving the thickness of one side of the board.

Such measurements are suitable with for hard boards that cannot bend under pressure.

Wet Film Thickness Gauge

An appropriate gauge is used in measuring the film coating thickness.

They contain teeth and notches with each tooth having a definite and calibrated size.

Coating measurement is done by placing the gauge onto it.

Eddy Current Probes

This method creates an oscillating electromagnetic field using test probes to measure the PCB thickness.

This measurement is very accurate and non-destructive but are limited to direct contact with the PCB sample.

What Is The Minimum Bend Radius of a Flex PCB?

The bend radius of a Flex PCB can be defined as the minimum degree the flex area bends.

To achieve the optimum minimum bending radius, the bend radius is calculated as follows:

  • One layer with a single side – Flex thickness x6
  • Two layer double side – Flex thickness x12
  • Multi layer – Flex thickness x24

For any questions or inquiry about flex PCB thickness or PCB fabrications, contact Venture Electronics now.

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