High-Class Coverlay PCB Manufacturer in China

You’re in good hands with PCBMay. We have perfected the process of Coverlay PCB manufacture, as we are a veteran in the Chinese PCB market.

  • Turn-key service provider for all your PCB needs
  • Make Multilayer, Flex and other PCB prototypes for you
  • Updated ISO 9001 and 1400 certification
  • Raw materials are eco-safe
  • On-time delivery – no hassle or delay
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We Offer the Finest Coverlay PCB

You need the finest Coverlay PCB in the market. But you also need to think about affordability. You can have both with PCBMay!

As a leading PCB Manufacturer in China, we are the expert in designing your Coverlay PCB. Should you need a competent OEM of PCBs, we are willingly at your service.

We have been producing PCBs in our Shenzhen facility since 2008.

With PCBMay, all types of PCBs are possible!

Types of Coverlay PCBSpecifically for You

FR4 Coverlay PCB

Your Coverlay PCB order is fulfilled alongside PCBs made with other subtrates such as CEM-1, CEM-2 and CEM-3. We make sure that the copper cladding base material is high-class and uncompromised.

Rigid-Flex Coverlay PCB

To fit devices with a hard outer layer but irregular contours, Rigid-Flex Coverlay PCB is necessary. For this product, adhesive thickness depends on both the Rigid PCB part and Flex PCB part. We measure these two elements correctly.

PTFE Coverlay PCB

Teflon Coverlay PCB is utilized in medical devices and automotive applications. Sophisticated designs of this type of PCB are possible because compared to FR4 material, PTFE is more heat resistant.

LED Coverlay PCB

For LED Coverlay PCB, we usually sell long reels. Because of length, they are also called Long PCBs. White color of coverlay is preferred but some prefer the natural/black color option. We also have other types of LED PCB for you.

Multilayer Coverlay PCB

Making Multilayer Coverlay PCB is part of our industry expertise. We can make 12 Layer PCB, 14 Layer PCB and more. These multiple layers are necessary to comprehensively cover industry digitalization.

Flexible Coverlay PCB

Part of customization, sometimes both soldermask and coverlay are used for Flexible Coverlay PCB. This is due to the fact that Flexible soldermask performs better with high-definition or HDMI PCBs.

PCBMay – The Undisputed Coverlay PCB Leader

Proving our claim that we are the experts in Coverlay PCB, we present to you this video. You can see that our facilities are tightly run according to industry standards. We are strict with these measures, as we care about our reputation.

As a result, PCBMay has gained thousands of customers who order Coverlay PCBs, as well as other Flex PCBs, such as those used for lighting and automotive industries.

Consider doing business with us, call now to order!

VPC Plating Line

Related Coverlay PCB

Led Chaser PCB
Led Chaser PCB
We offer Led Chaser PCB, up to 16 ft in reels. Usually, three layers of polyimide is used.
Module PCB
Module PCB
Durable power Module PCBs make it possible to have the correct signal level voltage for your needs.
Multilayer Flex PCB
Multilayer Flex PCB
Having the advantage of multiple layers and Flex PCBs, Multilayer Flex PCB fits into tight spaces.
Nelco PCB
Nelco PCB
PCBMay can produce a customized PCB for you with Nelco PCB materials (e.g. RF Link PCB).
For your OEM PCB, you can rely on us to produce after giving the Gerber file.
Purple PCB
Purple PCB
Thoroughly-made PCBs require applying soldermask. We can make a Purple PCB soldermask for you by request.
Since soldermask color can be changed, customers also prefer red color even if green is standard.
Single-sided Flexible PCB
Single-sided Flexible PCB
For home appliances such as washing machines, small ovens, Single-sided Flexible PCB use is widely adopted.

Coverlay PCB Production Details As Following Up

Brown Oxide
PTH Line
VCP Plating   AOI  Exposure E-Test
Layer Count1-40layers
Base MaterialKBShengyiShengyiSF305FR408FR408HRIS410FR406GETEK370HRIT180ARogers4350BRogers4000PTFE Laminates(Rogers seriesTaconic seriesArlon seriesNelco series)Rogers/Taconic/Arlon/Nelco laminate with FR-4 material(including partial Ro4350B hybrid laminating with FR-4)
Board TypeBackplane、HDI、High multi-layer 、blind&buried PCB、Embedded Capacitance、Embedded resistance board 、Heavy copper power PCB、Backdrill.
Board Thickness0.2-5.0mm
Copper ThicknessMin. 1/2 OZ, Max. 10 OZ
PTH Wall25um(1mil)
Maximum Board Size1100*500mm(43”*19”)
Min laser drilling size4mil
Min. Spacing/Tracing2.7mil/2.7mil
Solder MaskGreen, Black, Blue, Red, White, Yellow,Purple matte/glossy
Surface TreatmentFlash gold(electroplated gold)ENIGHard goldFlash goldHASL Lead freeOSPENEPIGSoft goldImmersion silverImmersion TinENIG+OSP,ENIG+Gold finger,Flash gold(electroplated gold)+Gold finger,Immersion silver+Gold finger,Immersion Tin+Gold finger.
Min. Annular Ring3mil
Aspect ratio10:1(HASL Lead freeHASL LeadENIGImmersion TinImmersion silverENEPIG);8:1(OSP)
Impedance control±5ohm(<50ohm), ±10%(≥50ohm)
Other TechniquesBlind/Buried Via
Gold Fingers
Press Fit
Via in Pad
Electrical Test

Here there’re many laminate material datasheets, they’re useful and helpful for you, please see them:

TU-872Modified EpoxyDOWNLOAD2003403.8-4.03.8
RO 3010Cer/PTFEDOWNLOAD50010.2
RO 4003Hydrocarbon/CerDOWNLOAD>2804253.38
RO 4350BHydrocarbon/CerDOWNLOAD>2803903.48
RT/duroid 5880PTFE/GlassDOWNLOAD5002.2
ISOLAPolyclad 370HRFR4DOWNLOAD1703404.8-5.1
HitachiMCL-BE- 67GModified EpoxyDOWNLOAD1403404.94.4
MCL-LX-67YSpecial LaminateDOWNLOAD185-195325-3453.4-3.6
NelcoN4000-13Modified EpoxyDOWNLOAD210-2403653.73.6
N4000-13EPModified EpoxyDOWNLOAD210-2403503.43.2
N4000-13SIModified EpoxyDOWNLOAD210-2403503.43.2
N4000-13EP SIModified EpoxyDOWNLOAD210-2403503.43.2
ArlonArlon 25NCerDOWNLOAD2603.38
Arlon 25FRCerDOWNLOAD2603.58
Arlon 33NPolymideDOWNLOAD>2503534
Arlon 35NPolymideDOWNLOAD>2503634.2
Arlon 85NPolymideDOWNLOAD2503874.2
StablcorST325DOWNLOADThermal conductivity:75w/m.k(with 1oz copper)
ST10DOWNLOADThermal conductivity:325w/m.k(with 1oz copper)
Bergquistht-04503DOWNLOADThermal conductivity:2.2w/m.k(with 1oz copper)


PCBMay offers flexible shipping methods for our customers, you may choose from one of the methods below.

1. DHL

DHL offers international express services in over 220 countries.
DHL partners with PCBMay and offers very competitive rates to customers of PCBMay.
It normally takes 3-7 business days for the package to be delivered around the world.

DHL Forwarder

2. UPS

UPS gets the facts and figures about the world’s largest package delivery company and one of the leading global providers of specialized transportation and logistics services.
It normally takes 3-7 business days to deliver a package to most of the addresses in the world.

UPS Forwarder

3. TNT

TNT has 56,000 employees in 61 countries.
It takes 4-9 business days to deliver the packages to the hands
of our customers.

TNT Forwarder

4. FedEx

FedEx offers delivery solutions for customers around the world.
It takes 4-7 business days to deliver the packages to the hands
of our customers.

Fedex Forwarder

5. Air, Sea/Air, and Sea

If your order is of large volume with PCBMay, you can also choose
to ship via air, sea/air combined, and sea when necessary.
Please contact your sales representative for shipping solutions.

Note: if you need others, please contact your sales representative for shipping solutions.

On our website you can use the following payment methods:

Telegraphic Transfer(TT): A telegraphic transfer (TT) is an electronic method of transferring funds utilized primarily for overseas wire transactions. It’s very convenient to transfer.

Bank/Wire transfer: To pay by wire transfer using your bank account, you need to visit your nearest bank branch with the wire transfer information. Your payment will be completed 3-5 business days after you have finished the money transfer.

Paypal: Pay easily, fast and secure with PayPal. many other credit and debit cards via PayPal.

Credit Card: You can pay with credit card: Visa, Visa Electron, MasterCard, Maestro.

    Unsurpassed Coverlay PCB Products from PCBMAY

    Finding a great supplier for your Coverlay PCB needs is not easy. You need to consider industry expertise as well as solid manufacturer capability. PCBMay is a responsible PCB maker who delivers what you need.

    • Your Coverlay PCB made with a high-class polyimide layer and adhesive
    • Suitable for use with EMI (Electromagnetic interference) or/RF shield layers
    • Correct application in areas of bending for Rigid, Flex and Rigid-Flex PCBs
    • We can customize the use of Coverlay and Soldermask together if necessary
    • We precisely measure your Coverlay PCB considering your PCB’s copper thickness

    Aside from these, assurances, PCBMay will make it a point to fit your budget. You can ask our sales time right now about our agreeable payment terms, depending on the specifics of your order. For sure, our Coverlay PCB price range is unbeatable!

    As a premium manufacturer of circuit boards, we are updated with advanced manufacturing processes. We also use the latest Quality Control checks to ensure our product is top-of-the-line. For your Coverlay PCB, we use the Flying probe test, E-test, and AOI.

    We do all of these Quality Assurance steps so that you do not need to worry about defective items. But just in case you have a question, we will answer the questions right away!

    Flexible PCB

    For example, you want to know about the status of your Coverlay PCB order—then we will give you the most current update immediately. We are here 24/, at your convenience.

    Let’s start our profitable partnership now! Inquire about your Coverlay PCB from PCBMay today!

    Coverlay PCB: The Ultimate FAQ Guide

    Do you want to improve the bendability of your flexible electric circuits?

    Coverlay PCB is an outstanding solution that provides adequate bendability in flexible printed circuits. Its proper design promotes the functionality of rigid, rigid-flex, and flex circuits.

    PCBMay is a responsible coverlay PCB manufacturer in China. We deliver the required services for a high-quality coverlay in flexible PCBs. If you are not familiar with its ins and outs, this FAQ guide will be a great help for you. Let’s make a move.

    What Is Coverlay In PCB Manufacturing?

    Coverlay is also known as cover film in the electronic world. It is a superb technique to protect the internal components of a PCB. Coverlay offers tremendous durability and flexibility in bending portions of FPCs (Flexible Printed Circuits).

    Coverlay, used in PCB manufacturing, is made of adhesive and high-class polyimides. Here, the thickness of polyimides and adhesives is around 0.001”. But, you can use polyimides and adhesives of different thicknesses concerning your design.

    Coverlay is used in different printed circuit boards. That’s why you can find various kinds of coverlay PCB in the electronic world. Such as

    • Rigid-flex PCB
    • PTFE PCB
    • LED PCB
    • Flexible PCB
    • FR4 PCB

    PCB coverlay is also compatible with multilayer designs. Coverlay protects the copper circuit layers located in the inner segment of the circuit boards. You can paste coverlay on 12 layers and 14 layer PCB stackup with outstanding reliability. So, it has become an excellent solution for multilayer flexible and rigid-flex circuits.

    Coverlay PCB

    Coverlay PCB

    What Are Coverlay PCB Materials?

    The principle coverlay PCB materials are polyimides and flexible adhesives. Coverlay thickness is the sum of the thicknesses of these materials. Here, coverlay adhesives are mainly acrylic or epoxy materials.

    There is also the presence of release paper in the coverlay PCB. The manufacturer eliminates the release paper while pasting coverlay on flexible printed circuits.

    Coverlay PCB materials offer a high dielectric strength in FPC. Its average dielectric voltage is 300 KV/0.001 inch. This value indicates that coverlay ensures sufficient insulation in flexible printed circuit boards.

    Usually, coverlay PCB lamination is processed under high thermal pressures. These materials offer tremendous temperature resistance in extreme conditions.

    Except for these, FR4, CEM-1, CEM-3, and PTFE materials are also used in coverlay circuit boards. The material selection depends on the use of coverlay PCBs and their specifications.  So, you need to give prior attention to choosing coverlay materials.

    Coverlay PCB Materials

    Coverlay PCB Materials

    What Is Bikini Coverlay Support In PCB Design With Altium?

    Bikini coverlay is a custom PCB coverlay used in rigid-flex printed circuit board designs with Altium. It is usually applied to specific portions of circuit boards. Besides, the designer can incorporate the bikini coverlay at any position of the layer stack.

    Altium Designer includes this bikini coverlay support to improve the design quality. It permits the user to incorporate multiple support layers to flex circuits. This addition helps view flexible designs in 3D mode. The users also configure specific materials through the bikini coverlay support.

    Besides, it allows the re-use of design tools that promotes the productivity of Altium PCBs. Bikini coverlay improves the management of vias and pads in flexible PCB designs.

    Bikini Coverlay Support In PCB Design With Altium

    Bikini Coverlay Support In PCB Design With Altium

    PCB custom coverlay has improved the design integrity to a large extent. Altium Designer is capable of using the libraries multiple times during the PCB designs. This bikini coverlay support makes it happen with supreme reliability. Watch this video about Altium bikini coverlay support:


    What Are The Differences Between Solder Mask And Coverlay In Flexible PCB Manufacturing?

    Flexible PCBs are compatible with two ways to protect the external circuitry from various contamination and forces. One is coverlay, and the other is a solder mask. But, how do you choose the best between these two techniques? Don’t worry.

    Here are some notable differentiating points between coverlay and solder mask for your convenience.


    The design rules for PCB coverlay and solder mask are different. Coverlay requires more giant webs to promote the robustness of FPCs. Besides, it is necessary to apply a high amount of adhesives to ensure proper lamination.

    Here, SMT and plated through-hole openings are created through laser cutting, die sets, etc. The smallest size of coverlay is around 0.6 mm for square openings.

    On the contrary, solder masks are used in both rigid and flexible designs. Unlike coverlay, it doesn’t require multiple openings for designing the fine pitch PCB components.


    Coverlay offers superb flexibility and robustness in bending areas of flexible circuits. But, soldermask can’t match the premium bendability of coverlay PCB in most cases.


    Soldermask offers a vast range of colors in PCB manufacturing. It is available in green, white, and black colors. But, light brown is the most common color for coverlay PCBs.


    PCB coverlay materials are adhesives and polyimides that render good electronic properties.

    Soldermask provides a lower dielectric thickness compared to coverlay due to variable thickness. In contrast to coverlay, flexible PCB solder mask materials are epoxy-reinforced. These materials are not suitable for consistent PCB thickness.

    EMI Shielding

    Soldermask PCB lacks the EMI shield layer lamination. That’s why it can’t assure maximum protection against electromagnetic interference. Coverlay is reputable for EMI reduction in high-frequency PCB projects.


    Coverlay PCB has improved application range due to outstanding bendability and long-term reliability of circuit board components. But, flexible solder masks are not the first choice in many applications.

    It will be beneficial to the manufacturer to apply coverlay first and then paste solder mask onto this coverlay. This combination enhances the efficiency and durability of electronic applications to a great extent.


    Coverlay thickness (27-50 micrometer) is higher than solder mask thickness (8-12 micrometer).

    These are the key points of coverlay vs. solder mask in flex PCB manufacturing. Coverlay is more beneficial to the manufacturer than solder mask from many aspects.

    Flexible Solder Mask Vs Coverlay In PCB Manufacturing

    Flexible Solder Mask Vs. Coverlay In PCB Manufacturing

    What Is The Coverlay PCB Thickness?

    Coverlay PCB covers a wide variety of thicknesses. Here, the standard thickness of polyimide and adhesives varies from 0.5 mils to 2 mils. But, one mil is the most common and viable coverlay thickness for flexible electronic applications.

    You need to choose the pre-attached adhesive thickness concerning the copper thickness used in lamination. A popular convention is using 1 oz copper for one mil adhesive.

    Adhesive thickness does not remain intact during coverlay lamination. So, it is crucial to apply a thick adhesive layer in coverlay PCB lamination. A considerable amount of adhesive is reduced because it fills the internal space between circuit components.

    That means you finally get a thinner circuit board after lamination. But, no such reduction of thickness happens for the polyimide layer.

    Coverlay PCB Thickness

    Coverlay PCB Thickness

    What Are The Applications Of Coverlay PCB?

    Coverlay PCB is widely used in flexible and rigid-flex electronic applications. You can use coverlay in the following sectors with superior reliability.

    Automotive Devices

    Coverlay PCB is ubiquitous in automotive sectors like GPS systems, automotive cars, anti-lock brakes, etc.


    The coverlay process is effective for reliable signal transmission. That’s why it is applicable in smartphones, laptops, WiFi routers, etc.

    Industrial Equipment

    Rigid-flex coverlay PCBs are various industrial equipment that requires sufficient bendability, such as robotics, sensors, etc.

    Medical Instrument

    Numerous medical instruments like pacemakers, scanners, and heart monitors contain coverlay PCBs.

    Widely Used Coverlay PCB

    Widely Used Coverlay PCB

    Which Design Software Is Effective For Designing Coverlay PCB Polygon?

    Among so many design software, Altium Designer is the most effective for designing coverlay PCB polygon. It contains valuable tools and library files that enable the designer to handle the polygon design easily.

    It is a simple process to place a coverlay polygon. You just need to keep Atium in the “Board Planning Mode.” Then, go to Design>Place Coverlay Polygon from the menu.

    Altium allows graphical editing to optimize the placement of coverlay polygons. The graphic editing makes the change of polygon’s shape, location easy. You can also place the coverlay polygon on the workspace directly by using this editing mode.

    All of these features make the Altium Designer undoubtedly the best design software for handling coverlay polygon designs.

    Coverlay PCB Polygon Design

    Coverlay PCB Polygon Design

    What Are The Significant Advantages Of Coverlay PCB?

    The significant advantages of using a coverlay PCB include-

    • It ensures flexibility and durability in flexible circuits.
    • Coverlay improves the functionality of bending areas of flex designs.
    • It is a good solution for EMI reduction in high-speed signal transmission systems.
    • This process delivers excellent chemical protection, along with commendable cost performance.
    • Coverlay polygon designs add immense positive sides to FPC. So, manufacturers prefer it in most rigid-flex applications.

    Coverlay PCB Significant Advantages

    Coverlay PCB Significant Advantages

    Which Considerations Are Important For Rigid-Flex Coverlay PCB Design?

    If you want to develop the bendability of flexible circuits, you have to ensure a flawless coverlay PCB design. So, you need to keep in mind some crucial considerations about coverlay. Such as

    • You should set the coverlay opening size based on the flexural strength of the flexible printed circuits.
    • Coverlay adhesive thickness is reduced after the lamination. So, you need to apply thick adhesive layers for this PCB.
    • The minimum material web needs to be higher than the threshold value. Otherwise, the adjacent opening can’t hold the materials properly.
    • While using coverlay and solder mask together, it is worthwhile to paste coverlay first and then apply solder mask.
    • The lowest spacing for square coverlay opening should be 0.25mm. But, it is around 0.15mm for round openings of overlay.

    Coverlay PCB Design In Altium

    Coverlay PCB Design In Altium

    These considerations are crucial for optimizing the coverlay design in flexible circuit boards. Except for these, the design rules for multilayer coverlay circuit boards or rigid-flex PCBs are almost the same as using solder masks.  Check this video to know more about rigid-flex PCB design:


    What Are The Limitations Of Coverlay PCB?

    Coverlay PCBs have some limitations. You can’t develop PCB coverlay as LPI soldermask, and it requires additional attention while drilled or cut. These disadvantages limit the application of coverlay in flexible PCBs.

    It is not supremely applicable for fine pitch surface mount devices. But, proper execution of coverlay lamination with smooth laser cutting makes it compatible with a vast range of flexible circuits.

    Coverlay is a technical process of covering electric components. Moreover, coverlay designs are limited to rectangular shapes in most cases. You can solve this issue by choosing an experienced manufacturer. Skill and experience are mandatory for achieving the utmost outcome of PCB coverlay.

    Limitations Of Coverlay In Printed Circuit Board

    Limitations Of Coverlay In Printed Circuit Board

    How To Check The Performance Of A Coverlay PCB?

    It is essential to check the coverlay PCB performance from time to time. Regular inspection improves the quality of electric circuits.

    The PCB coverlay process is related to mechanical techniques like laser cutting, coverlay adhesive pasting, etc. That’s why you need to conduct some reliable automated tests to find defects in these processes.

    Automated X-ray Inspection (AXI Test) is used in checking mechanical issues of this PCB. Such as the coverlay thickness, accuracy of laser cutting, drilled hole diameter, etc. In this method, the X-ray is applied to the coverlay PCB. This highly porous ray delivers a clear vision of critical segments of bendable circuits.

    You can easily find the defective parts of bending areas of flexible printed circuits through this test. Besides, a functional test is viable to get a deep understanding of the circuit board’s actual behavior.

    Except for the AXI test, the flying probe test and AOI test are reliable for checking the electrical properties of coverlay PCBs.

    What Is The Reliable Method For PCB Coverlay Opening?

    There are two reliable methods of PCB coverlay opening.

    Tool Opening

    The most common PCB coverlay opening is to open a tool. It is suitable for large-scale coverlay PCB production. This process is easy to handle and cost-effective. If you have budget constraints, you should choose the tool opening for your PCB coverlay.

    Laser Cutting

    Laser cutting requires outstanding accuracy. Besides, it is more expensive than the other process of coverlay opening. That’s why laser is used in the small-scale production of coverlay PCBs or prototype PCBs.

    If you can ensure accuracy in designing coverlay and are aware of coverlay meaning, laser cutting is also an effective opening method.

    PCB Coverlay Opening

    PCB Coverlay Opening

    How Do You Choose The Coverlay PCB Manufacturer In China?

    The following considerations are essential for choosing a trustworthy manufacturer of coverlay PCB in China.

    • It must have the ability to deliver what the consumer wants in the case of designs, thickness, assembly, etc.
    • Cost-effective products
    • Experienced and professional engineers with well-equipped factory service are mandatory.
    • Reliable custom solutions of different issues related to PCB coverlay. Such as incorporating coverlay and soldermask together.
    • Short lead time
    • OEM and ODM service
    • Customer service in sales and technical sectors.
    • Proper testing facility

    We deliver different types of coverlay PCB at unbeatable price ranges. We have full certification of CE, RoHS, and IPC. If you want OEM service within a short period, we have skilled technicians to handle this issue.

    What Is The Effect Of Coverlay Adhesive In Flexible PCBs?

    Coverlay adhesives are used in binding layers of flexible circuit boards. It acts to save the PCB components from external contaminants. In coverlay PCB, epoxy and acrylic-based adhesives are applied to create a bonding between flex PCB layers.

    PCB Coverlay adhesives provide sufficient chemical, mechanical, and dielectric protections. If a circuit board goes through frequent bending, it must ensure the proper thickness of adhesives.

    Usually, abrasion creates delamination in PCB coverlay films that results in a deficiency of flexible printed circuits. Coverlay adhesives prevent the damage of coverlay edges. That’s why they have considerable effects on the lamination process.

    Coverlay Adhesive In Flexible Printed Circuits

    Coverlay Adhesive In Flexible Printed Circuits

    How Do You Choose The Best FPC Coverlay For Your Flexible Circuits?

    When you are choosing FPC coverlay for flexible electronic appliances, you have to consider some factors. It will be difficult for you to choose the best coverlay if you are unaware of the following issues.

    • Coverlay thickness
    • Dielectric strength
    • Color
    • Competitive cost
    • Photoimageable coverlay capabilities.
    • Chemical resistance
    • Flexural strength
    • Customization facility
    • Durability

    Contact us. We provide the best FPC coverlay lamination at affordable costs.

    Flexible Printed Circuits Coverlay

    Flexible Printed Circuits Coverlay

    Do FPC Coverlay PCB Design Support Customization?

    Coverlay PCB design rules are supremely supportive of customization. It allows the combination of coverlay and soldermask on the PCB surface. In the flexible coverlay circuit boards, this customization is widespread.

    Since solder mask is beneficial to HDMI PCBs, it improves the quality of flex coverlay circuits. Besides, you have the opportunities to customize the coverlay thickness, number of layers, materials according to the product designs.

    Such as PTFE is more heat resistant compared to FR4 materials. You can incorporate PTFE during the PCB manufacturing with FR4. Proper customization also affects the cost, along with promoting the performance of flexible circuits.

    Customized FPC Coverlay

    Customized FPC Coverlay

    How To Paste Coverlay On Flexible Circuit Boards?

    The basic procedure of coverlay pasting of flexible circuit boards is given below.

    • First, check that there is no missing drilling and punching on the coverlay and films.
    • Ensure that the flexible printed circuit is oxidation-free.
    • Place the coverlay on the FPC. It is required to keep the face of the release film and coverlay up and down, respectively.
    • You need to consider the “C” marking line and pads while pasting the coverlay.
    • Then, peel off the release film by holding the coverlay properly.
    • Fix it through soldering iron so that it doesn’t deviate from its alignment.

    What Are The Positive Effects Of Photoimageable Coverlay PCB?

    Photoimageable coverlay PCB has brought out a new dimension in flexible electronic products. It offers immense positive impacts on flexible circuit board designs that you don’t get in solder mask PCBs.

    Its significant positive effects include-

    • PIC (Photoimageable Coverlay) ensures hassle-free hole plugging in multilayer flex PCBs.
    • Its repair is easy, and curing time is shorter than other technologies used in FPC.
    • It offers consistency in thickness.
    • Photoimageable coverlay meaning is very straightforward. It is supportive of the implementation of a gold plating bath, along with immersion gold.
    • PIC is free from screen printing.
    • PIC provides impressive chemical resistance and flexural strength in circuit boards.
    • The photo imaging capability of PIC is excellent.
    • Coverlay is pollution-free to a great extent. There is no silicon-based defoamer present in PIC. That’s why there is almost zero pollution at the PCB pad edge.

    Photoimageable Coverlay PCB

    Photoimageable Coverlay PCB

    How To Reduce Bubbles During Photoimageable Coverlay PCB Lamination?

    Lamination is the most vital segment of processing of a photo-imageable coverlay (PIC) PCB. In this case, bubble reduction is a massive challenge to the manufacturer.

    A low hot-press temperature is effective for preventing bubbles in coverlay lamination. Besides, you can use vacuum fast-press equipment when the design layout is isometric or highly dense. It helps achieve the optimum result in photo-imageable coverlay lamination.

    Again, you can conduct the lamination at a low temperature. Excessive heat promotes the production of bubbles in PCB coverlay.

    Coverlay PCB Laminate Bubble Reduction

    Coverlay PCB Laminate Bubble Reduction

    What Are The Colors Of A Coverlay PCB?

    Coverlay PCBs are available in limited colors. In most cases, coverlay color PCB is found a light brown color that is its natural color. Sometimes, natural color is not suitable for flex circuits due to its visibility.

    Coverlay color PCB has significant uses in flexible electronics. In that case, the manufacturers use white or black coverlay in FPC. You should choose the most appropriate color for this PCB based on your requirements.

    Coverlay PCB Colors

    Coverlay PCB Colors


    Coverlay PCB delivers excellent performance in modern electronic applications. A proper application of coverlay in bending areas promotes the durability and functionality of entire circuit boards. Nowadays, manufacturers prefer PCB coverlay to soldermask for achieving supreme bendability.

    PCBMay ensures you the best quality of different types of coverlay PCBs at reasonable prices. We hope you will get answers to your queries from this FAQ guide. For more information about this PCB, contact us immediately. We are available 24/7 at your convenience.

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