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Stiffener Board

  • Wide range of stiffener board
  • Hochwertig und leistungsstark
  • Authentic and functional
  • Hergestellt durch fortschrittliche Technologie

Venture as a Reliable Stiffener Board Manufacturer in China

stiffener board

If you are looking for a reliable quality stiffener boards for your flexible PCB, always consider to purchase at Venture. We design and produce stiffener boards for your electronic applications. We are a trusted turnkey solution provider for more than 10 years.

At Venture, we have a wide range of stiffener boards that can provide you a lot of benefits and advantages. Our stiffener boards have the capacity to be folded, twisted, or bended. Venture stiffener boards are widely used for supporting certain parts of a PCB.

Because of our rich experience in the industry, we become one of the leading stiffener board manufacturers in China. As a professional manufacturer, we have been committed to giving customers high-quality products and excellent services.

Trusted Stiffener Board Manufacturer in China

stiffener board

Venture is a rich-experienced PCB manufacturing company that produces a wide range of products. We are committed to deliver the best quality products at an affordable prices and excellent services. Venture also established a good relationship to business firms around the world.

At Venture, you can find the broadest range of stiffener boards. All our stiffener boards are widely used for support certain parts of a PCB to make it stable and rigid. Thus, components can be added or soldered to the board easily.

Aside from that, Venture stiffener boards are also designed specifically for solder joint reinforcements. These are also used to handle the board easily for easy soldering and placement of components into the board.

stiffener board

Additionally, we manufacture stiffener boards with abrasion resistance. These are also designed to provide heat sink that will eliminate unnecessary temperature from other components. Venture stiffener boards can surely make your flexible PCB performs with functionality.

Venture stiffener boards are made from high-grade materials. We have used FR4, polyimide, aluminum, and stainless steel. Every Venture stiffener boards made from these materials offers lots of advantages for your flexible circuit design applications.

stiffener board

Because of our rich experience in the industry, we become one of the leading stiffener board manufacturers in China. As a professional manufacturer, we have been committed to giving customers high-quality products with affordable prices and excellent services.

Send inquiry for your next stiffener board orders!

Stiffener Board: The Complete FAQs Guide

In PCB manufacturing, stiffener boards are an essential necessity in various flexible PCB designs.

Flex circuit boards are among the popular types of PCB currently on the market due to their versatility during application.

What Is Stiffener Board?

A stiffener board function is to give mechanical support and is not component of electrical schematic of the PCB design.

PCB stiffeners are a popular requirement in many flexible circuit board designs.

Stiffener Board

Stiffener Board

Is There Difference Between PCB Stiffener And PCB Busbar?

PCB busbars and stiffener boards are somehow confusing. They describe similar product having one major difference.

Every busbar board is a PCB stiffener, yet not every stiffener board is a busbar. A circuit board busbar can conduct power and includes a dielectric coating.

Furthermore, majority of PCB busbars are manufactured utilizing copper or brass, and might be multilayered.

PCB Busbar

PCB Busbar

What Are The Uses Of PCB Stiffener?

Every type of material for PCB stiffener gives numerous advantages based on your requirement for the PCB design.

Let’s look at the popular applications of stiffener boards from which you can establish which material type is best appropriate for the application.

Supporting PCB Parts Or Connector Areas

You can use stiffener board made of different materials to support PCB components or connector areas. For the least costly stiffener material, FR4 or polyimide is the best choice.

FR4 is the best option if you want a material that will make the PCB more rigid. This is in addition to allowing the circuit board to be utilized as carrier panel for purposes of assembly.


For uses as ZIF connector, you can utilize only polyimide PCB stiffeners, which facilitate for the needed increased thickness at connector contacts. You can apply the stiffener utilizing thermally bonded adhesive only, which you attach prior to profiling the part outline.

During application, the stiffener should be oversize to the component outline, which allow you to cut the stiffener board and component outline concurrently. This ensure that you attain tight dimensional tolerances needed by ZIF connector.

Extra Thickness And Strength

Polyimide stiffener boards are ideal if you need to increase PCB thickness within a specific section. They are equally suitable if the flexible circuit board will experience greater than usual wear and tear.

Management Of Thermal Transfer

Aluminum PCB stiffeners are the best choice for flex PCB that generate excessive heat that should be dissipated.

Their capability to transfer heat facilitates the heat conduction away from the parts to underneath the flex PCB. Here, it can be eventually be dissipated into the PCB enclosure or environment.

Controlling Bend Locations

In certain PCB designs there might be need to restrict the bend locations to particular locations. Polyimide stiffener board is the commonly utilized though some applications might need FR4.

This allows the flexible PCB to superbly fit inside the final equipment or product without the possibility of getting damaged. Additionally, it also facilitates the PCB assembly process.


Controlling expenses is a vital feature of efficient flexible circuit board design.

Generally, polyimide stiffener boards are the most cost-efficient. The ease of crafting them employing die or laser cutting makes handling polyimide PCB stiffener simpler.

FR4 stiffener is cost-saving and broadly applied as well, and its extra rigidity resulting in stable and even surface. Nonetheless, it usually needs extra drill and routing procedures to fabricate.

Stainless steel and aluminum materials are costlier and normally need more expensive machining procedures.

For that matter, it is important to evaluate the flexible circuit design specifications to determine the ideal stiffener board type for the application.

When Is Stiffener Board Necessary For Flex PCB?

You require stiffener board when:

  • PCB Components are located within a flex zone.
  • Weight of PCB Components positioned within the flexible zone strains the flexible board material.
  • It is necessary to create a firm and even surface on the flex board for SMT parts mounting.
  • Working with connectors requiring several insertions to minimize strain on pads.

Which Are Materials For Stiffener Board For Flexible PCB?

Choosing the suitable stiffener board material is crucial if designing a flexible PCB. The right material can give a myriad of necessary benefits depending on the application.

You need to consider cost and establish extra benefits about a particular material before opting for it. There are four key PCB stiffener materials which include:



  1. FR4

Also known as G10, FR4 refers to a woven fiberglass laminate impregnated with epoxy. When utilized in flex PCB, FR-4 stiffener board normally comes unclad.

The standard thickness of FR4 PCB stiffener spans from 0.008” down to 0.059”. For certain applications, you may place plated holes or copper pads onto the FR4 stiffener for purposes of mounting components.

FR4 PCB stiffener ought to be on one side with the PCB parts/connectors if dealing with plated thru-hole PCB. This permits access to solder pads on the other side of the circuit board.

With SMT flexible PCB, you should place the FR4 PCB stiffener on the adjacent edge of the components.

  1. Polyimid

Polyimide incorporates high-temperature polymer formed into fine film layer. Polyimide PCB stiffeners have varying thicknesses, yet you can fuse several layers to create thicker stiffener boards.

These PCB stiffener thickness span from 0.001 inches down to 0.009 inches though flexible PCB often needs a thickness of about 0.005 inches. Thermal set adhesive is the best for polyimide stiffener attachment.

You can use them with various types of connectors or components but are especially needed for ZIF connectors. This stiffener type allows you to fulfil the specifications of ZIF connector thickness.

  1. Rostfreier Stahl

Stainless steel stiffener boards are the best option when you require more rigidity above what FR4 types can offer.

There might be sections on the flex PCB that need support, yet FR4 and polyimide simply cannot give the needed strength. This owes to space limitations which restrict the stiffener board thickness.

Stainless steel PCB stiffener board is capable of ensuring the thinness necessary in these segments whilst giving the firmness needed. Nonetheless, you should remember that stainless steel is more expensive in comparison to other stiffener board materials.

  1. Aluminium

This is another stiffener board material option for flexible printed circuit boards. Aluminum PCB stiffener is highly suitable for applications that involve excessive heat generation.

To conduct and dissipate the generated heat, you add aluminum stiffener which serves as heat sink. This will ensure the connectors and components stay cool since the aluminum PCB stiffener will conduct the heat from them.

Aluminum PCB stiffener cost, just as stainless steel type, will be higher in comparison to FR-4 or polyimide varieties.

How Do You Join PCB Stiffener Flexible Circuit Board?

There are two main attachment methods for PCB stiffeners which include:

Thermal Set Adhesive

The preferred method of attaching the stiffener board is to thermally stick it to the circuit board utilizing heat and pressure. This technique of attachment employs flexible adhesive like that applied in coverlays attachment.

Using thermal set adhesive to attach stiffener board to flex PCB leads to an exceptionally strong permanent bond.

Druckempfindlicher Klebstoff

An alternative method of attaching stiffener board is using pressure sensitive adhesive when the flex PCB design does favor use of flexible adhesive.

The distinct PSA will rely on whether the flexible circuit board will undergo automated reflow cycle or not. Also, the stiffener board material determines the type of thermal sensitive adhesive used.

The location and/or configuration of the PCB stiffener will dictate the type of adhesive used. For example, the stiffener board will need PSA attachment and extra stiffener outline integrated to the silkscreen to facilitate accurate placement. This is necessary when the stiffener does not stretch out to the PCB outline.

Attachment of Stiffener Board

Attachment of Stiffener Board

What Is The Difference Between The Two PCB Stiffener Attachment Techniques?

As already highlighted, pressure sensitive adhesive (PSA) and thermal bonding are the two primary techniques of attaching stiffener boards to flexible PCB.

The table below highlights the features and differences between the two methods:

Thermal Set AdhesiveDruckempfindlicher Klebstoff
Attachment of stiffener board to flex PCB is achieved through heat and pressureAttachment of stiffener to flex PCB is through applying pressure only.
Stronger BondBond not very strong
TeurerWeniger teuer
Will lead to considerable damage to the circuitry whilst removing from the flex PCBNormally removed with negligible or no damage when you are careful during removal
procedure consumes more timeProcedure consumes less time
Applied in binding in IPC class 3 devices (Avionics, military application among others)Applied in binding within IPC class 2 gadgets (laptops and other consumer electronics.)

Can You Have Multiple Stiffener Board Thicknesses In One PCB Design?

In certain instances, you can use multiple stiffener board thicknesses within one flexible PCB design. However, a manufacturability review is necessary since there exist certain limitations in this procedure.

You can attach the PCB stiffener to one or either sides of the circuit board. Your supplier will need to review the assembly array configuration and assembly requirements when the stiffener is bonded to both sides. This helps in determining whether you will encounter any complications during assembly.

It is typical and cost saving to incorporate FR4 stiffener across the array border for flex PCB designs having assembly array requirement.

This leads to a firm array that often permits the component to undergo automated assembly in similar way as rigid PCB design. Consequently, this eliminates the necessity for any extra tooling plates among other equipment.

What Are The Considerations When Applying Stiffener Boards?

PCB stiffeners function as vital yet non-integral components of the circuit board. As a result, you should factor in the following when using them on you rigid-flex or flexible PCB design:

  • Make sure that the stiffener board overlaps and is barred to overlay by 0.030” to decrease stress or pressure.
  • Maintain similar thickness, specifically in situations where you are using several stiffeners.

Is The Stiffener Board Size Important During Selection?

The size of stiffener board is equally a critical consideration because you require them to fit on the PCB together with other components. Moreover, PCB stiffener size also affects weight, you will face challenges when you incorporate many heavy stiffener boards.

Nevertheless, thicker stiffener will guarantee more support. The thickness selected relies on the circuit board design and elements that will fit within the area you have with other parts.

Typically, you will find yourself using stiffener board thicknesses of 0.020”, 0.031”, 0.039” and 0.059”. The thickness choices will range from 0.008 inches to 0.059 inches.

What Is The Conventional Stiffener Board Thickness?

The stiffener board thickness is an essential consideration since it influences the PCB specifications, specifically mil-specifications.

Polyamide stiffeners come in various thicknesses: 25μm (0.001”), 50μm (0.002″), 75μm (0.003″) and 125μm (0.005″). Similarly, FR4 stiffener board thickness spans from 0.08 mm (0.003″) to3.18 mm (0.125″).

The popular thickness of aluminum/stainless steel stiffeners range from 4mil (0.1mm) to 18mil (0.45mm).

Stiffener Board Thicknesses

Stiffener Board Thicknesses

How Does Rigidized Flex PCB Vs Rigid-Flex PCB Compare?

  • Rigidized flexible PCB refers to flex circuit board fused with FR-4 stiffener board to improve rigidity during fabrication.

On the other hand, rigid-flex circuit boards refer to hybrid PCBs that incorporate rigid and flexible PCB substrates. You laminate the 2 PCB substrates into one structure.

  • There are no board traces on the rigid section of rigidized flex PCB, even on pads. The role of rigid part is only to enhance the rigidity of where it is attached, thus providing mechanical support to flexible PCB.

Nevertheless, for rigid-flex printed circuit boards, both flexible and rigid and flexible segments feature traces and are linked utilizing via holes. It is due to this fact that rigid-flex circuit board is for electrical interconnection and not mechanical support.

Rigidized flex circuit boards provide mechanical support only whereas rigid-flex PCBs include electrical connections as well.

Does Stiffener Board Affect PCB Performance?

Stiffener boards can enhance the performance of the printed circuit board. They aid in alleviating stress that may affect the manner in which PCB components function and the general operation of the circuit board.

They also positively influence reliability. Without stiffener boards, a flexible PCB will be very weak.

The PCB stiffener guards each component through providing extra reinforcement. They equally permit the PCB spot strengthening.

Spot strengthening is crucial because reinforcing the entire board will fail due to its weight would be too heavy to maintain it rigid.

In summary, a stiffener board enables a PCB to serve its purpose without breaking down due to wear prior to its useful lifespan.

How Do You Specify Stiffener Board Requirement In Flexible PCB Design Drawings?

To fully and precisely specify the stiffener board, you will need to communicate the following information to your PCB manufacturer:

  • Stiffener Outline/Dimensions
    • Delivered as an extra Mechanical Gerber File(S) (Recommended) or as 1:1 DXF File(S)
    • Described in Mechanical Drawing
    • One for Every Stiffener
  • Stiffener Material Type

Defined in both the material stack up and drawing notes.

  • Befestigungsmethode

Described in both material stack up and drawing notes.

  • Stiffener Attachment Side(s):

Described in material stack up.

  • Stiffener Hole Sizes and Drill File (If necessary for PTH Designs)

Delivered as extra drill file with drill charts

ZIF Connectors Part Numbers and Manufacturer(s)

  • Described in drawing notes and mechanical drawing
  • Designate specific location in designs having more than a single ZIF connector

At Venture Electronics, we offer a range of stiffener boards depending on your requirements and specifications.

Kontaktieren Sie uns jetzt for all your stiffener boards.

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