Skillfully Constructed Multilayer Flex PCB by PCBTok

The Multilayer Flex PCB is constructed using single-sided or double-sided circuits. Moreover, they are combined and interconnected through Plated-Through Holes.

PCBTok conducts a specific way of constructing this board to ensure the interconnections are adequately linked because they are significant in applications.

In addition, since this is a flexible circuit, it is composed of two or more conductive copper layers through an insulation material, either flexible or rigid.

Grab our enhanced quality Multilayer Flex PCB today! We’ll guarantee the best offers to save you a lot in the long run.

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PCBTok is Resolute to Supply Notable Multilayer Flex PCB

Since we’ve been in the industry for over a decade, we are highly capable of manufacturing your desired Multilayer Flex PCB aligned to your specifications.

Additionally, we offer a wide range of services to support your purchases through the help of our well-experienced and skilled technicians and engineers.

We offer 24-hour return service for any Prototype PCBs from us. All of our boards have met IPC Class 2 or 3. Also, all files were reviewed by CAM before production.

PCBTok deploys half a thousand personnel to our facility to monitor your products.

Our dedication to providing the best quality services and products to our consumers has gained us tremendous amounts of commendations across the globe.

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Multilayer Flex PCB By Feature

Single-Sided Flexible PCB

The Single-Sided Flexible PCB has one conductive copper layer that is bonded in between the two insulating polyimide layers. Its common stack-up goes from coverlay, copper, and flex core. In addition, it has EMI and RF shielding films.

2-Layer Flexible PCB

The 2-Layer Flexible PCB is composed of two conductive layers that have an insulating polyimide in between the external polyimide layers. In addition, it has a common stack-up that goes from coverlay, copper, flex core, copper, and coverlay.

4-Layer Flexible PCB

The 4-Layer Flexible PCB offers much higher circuit density than a lower-layered count of flexible boards. In addition, it has a wide temperature range, thus, making it ideal for high-current applications and a highly reliable alternative.

6-Layer Flexible PCB

The 6-Layer Flexible PCB has a wide variety of options in its board thickness and copper thickness, depending on your desired applications. In terms of its capabilities, it has enhanced thermal management and offers more durability and reliability.

8-Layer Flexible PCB

The 8-Layer Flexible PCB can operate in extreme temperatures because of its wide operating temperature range. Moreover, it has enhanced signal quality, impedance control, and reliability. Thus, they are ideal for communications.

10-Layer Flexible PCB

The 10-Layer Flexible PCB offers less curing time in applying its prepreg layer. After its prepreg cures, they are already suitable for users and services. In addition, it has enhanced mechanical strength that protects the board from damage.

What is Multilayer Flexible PCB?

If a board has three or more conductive layers with insulating layers between the internal and external polyimide layer, it is called Multilayer Flex PCB.

One of the popular ways of providing circuit connection throughout its circuit is by PTH. Moreover, it can be constructed in the most common way, such as coverlay, copper, flex core, copper, adhesive, flex core, copper, and coverlay.

Its flex core materials come with a standard thickness of ½ mil up to 4 mils for its adhesive or adhesiveness construction. Also, its traditional copper thicknesses are 1/3 oz to 2 oz in rolled annealed (RA) or electrodeposited format (ED).

Contact us today, and avail our top-tier quality PCB products at an affordable rate!

What is Multilayer Flexible PCB?
When to Use Multilayer Flexible PCB?

When to Use Multilayer Flexible PCB?

We now know the general description of this board. Now, we’d like to share with you the appropriate usage of a Multilayer Flexible PCB.

  • This board is ideal for ground and power plane applications.
  • They are ideal for shielding applications.
  • This is ideal if the circuit density and layout cannot be routed on a single layer.
  • It can be ideal for controlled impedance with shielding.
  • They are ideal for applications that require increased circuit density.
  • This board can be a good option for crosstalk elimination.

These are all the common usage of this board; inquire today to know more about it!

Multilayer Flexible PCB Features

The following are the characteristics you can enjoy in a Multilayer Flex PCB:

  • It can support up to eight (8) conductive layers.
  • It is capable of supporting resistive foils like cupronickel and constantan.
  • It has unbonded regions that enhance its flexibility.
  • It has a wide variety of stiffener options; Polyimide (0.75 mm to 0.20 mm), FR4 (0.15 mm to 2.0 mm), and formed metal parts (0.075 mm to 1.0 mm).
  • It caters to screened inks and photo-imageable solder masks.
  • It offers various layers options; 2 up to 14+ layers.
  • It can support EMI/RF shielding films.
Multilayer Flexible PCB Features

Choose PCBTok's Noteworthy Multilayer Flexible PCB

Choose PCBTok's Noteworthy Multilayer Flexible PCB
Choose PCBTok's Noteworthy Multilayer Flexible PCB

Our over twelve (12) years of experience in the industry have gained extensive knowledge in producing the highest-quality PCB products.

In addition, throughout that course, we have conducted various studies to further enhanced the performance and quality of our Multilayer Flex PCB products.

PCBTok continuously aims to provide its consumers with top-tier products through high-grade raw resources and technologies that can serve its customers for years. Our primary objective is to help quality items at an affordable cost.

Nevertheless, you can be sure that the products you receive are not subpar; we will ensure that they undergo rigorous tests and inspections for better operation.

Immediately grab our limited offers for our PCB products today!

Multilayer Flex PCB Fabrication

Benefits of Multilayer Flexible PCB

You can enjoy numerous benefits in a Multilayer Flex PCB, and we’d like to share them with you for better understanding in this section.

Due to their advantages, they are widely preferred in various industries, including automotive, medical, industrial, and aerospace industries.

One of its advantages is reduced assembly time, cost, size, and weight. Additionally, it has increased heat dissipation and enhanced durability.

Also, it has increased system reliability, reduced wiring errors, improved signal integrity, enhanced reliability, and excellent impedance control.

If this is what you’re seeking, then immediately contact us for faster transactions!

Multilayer Flexible PCB Surface Finishes Selections

One of the concerns in every circuit board is oxidation since this particular board has copper on it. Hence, we recommend applying a surface finish.

It is one way of preventing oxidation and corrosion and ensuring good solderability; thus, choosing a suitable protective layer is essential.

We offer various treatment options, including HASL, Lead-Free HASL, OSP, ENIG, Electrolytic Hard Gold, Selective Gold, Immersion Tin, and Silver.

Among all of these mentioned finishes, we strongly suggest going for Electrolytic Soft Gold, Electrolytic Hard Gold, and Selective Gold.

Kindly message us immediately for further information about this.

OEM & ODM Multilayer Flex PCB Applications


Due to this particular board’s enhanced signal quality, durability, and reliability, they are widely preferred in satellite applications.

GPS Systems

Since GPS systems require better heat dissipation and increased reliability, it specifically deploys this board because it can deliver those.

Automotive Engine Controls

One of the advantages of this board is its improved system reliability that reduces failure; they are highly deployed in automotive engine controls.


Due to the capability of this board to operate efficiently in high-density applications and improved airflow, they are commonly used in the avionics industry.

Cellphones and Cameras

Since Cellphones and Cameras require lesser weight and size to incorporate into the device, they employ this particular board because it has a complex design board.

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PCBTok – Highly Reputed Multilayer Flex PCB Supplier in China

All of our circuit board products are thoroughly inspected to ensure their performance.

We only impose high-class products on the market to benefit our customers.

Multilayer Flex PCB Production Details As Following Up

NO Item Technical Specification
Standard Advanced
1 Layer Count 1-20 layers 22-40 layer
2 Base Material KB、Shengyi、ShengyiSF305、FR408、FR408HR、IS410、FR406、GETEK、370HR、IT180A、Rogers4350、Rogers400、PTFE Laminates(Rogers series、Taconic series、Arlon series、Nelco series)、Rogers/Taconic/Arlon/Nelco laminate with FR-4 material(including partial Ro4350B hybrid laminating with FR-4)
3 PCB Type Rigid PCB/FPC/Flex-Rigid Backplane、HDI、High multi-layer blind&buried PCB、Embedded Capacitance、Embedded resistance board 、Heavy copper power PCB、Backdrill.
4 Lamination type Blind&buried via type Mechanical blind&burried vias with less than 3 times laminating Mechanical blind&burried vias with less than 2 times laminating
HDI PCB 1+n+1,1+1+n+1+1,2+n+2,3+n+3(n buried vias≤0.3mm),Laser blind via can be filling plating 1+n+1,1+1+n+1+1,2+n+2,3+n+3(n buried vias≤0.3mm),Laser blind via can be filling plating
5 Finished Board Thickness 0.2-3.2mm 3.4-7mm
6 Minimum Core Thickness 0.15mm(6mil) 0.1mm(4mil)
7 Copper Thickness Min. 1/2 OZ, Max. 4 OZ Min. 1/3 OZ, Max. 10 OZ
8 PTH Wall 20um(0.8mil) 25um(1mil)
9 Maximum Board Size 500*600mm(19”*23”) 1100*500mm(43”*19”)
10 Hole Min laser drilling size 4mil 4mil
Max laser drilling size 6mil 6mil
Max aspect ratio for Hole plate 10:1(hole diameter>8mil) 20:1
Max aspect ratio for laser via filling plating 0.9:1(Depth included copper thickness) 1:1(Depth included copper thickness)
Max aspect ratio for mechanical depth-
control drilling board(Blind hole drilling depth/blind hole size)
0.8:1(drilling tool size≥10mil) 1.3:1(drilling tool size≤8mil),1.15:1(drilling tool size≥10mil)
Min. depth of Mechanical depth-control(back drill) 8mil 8mil
Min gap between hole wall and
conductor (None blind and buried via PCB)
7mil(≤8L),9mil(10-14L),10mil(>14L) 5.5mil(≤8L),6.5mil(10-14L),7mil(>14L)
Min gap between hole wall conductor (Blind and buried via PCB) 8mil(1 times laminating),10mil(2 times laminating), 12mil(3 times laminating) 7mil(1 time laminating), 8mil(2 times laminating), 9mil(3 times laminating)
Min gab between hole wall conductor(Laser blind hole buried via PCB) 7mil(1+N+1);8mil(1+1+N+1+1 or 2+N+2) 7mil(1+N+1);8mil(1+1+N+1+1 or 2+N+2)
Min space between laser holes and conductor 6mil 5mil
Min space between hole walls in different net 10mil 10mil
Min space between hole walls in the same net 6mil(thru-hole& laser hole PCB),10mil(Mechanical blind&buried PCB) 6mil(thru-hole& laser hole PCB),10mil(Mechanical blind&buried PCB)
Min space bwteen NPTH hole walls 8mil 8mil
Hole location tolerance ±2mil ±2mil
NPTH tolerance ±2mil ±2mil
Pressfit holes tolerance ±2mil ±2mil
Countersink depth tolerance ±6mil ±6mil
Countersink hole size tolerance ±6mil ±6mil
11 Pad(ring) Min Pad size for laser drillings 10mil(for 4mil laser via),11mil(for 5mil laser via) 10mil(for 4mil laser via),11mil(for 5mil laser via)
Min Pad size for mechanical drillings 16mil(8mil drillings) 16mil(8mil drillings)
Min BGA pad size HASL:10mil, LF HASL:12mil, other surface technics are 10mil(7mil is ok for flash gold) HASL:10mil, LF HASL:12mil, other surface technics are 7mi
Pad size tolerance(BGA) ±1.5mil(pad size≤10mil);±15%(pad size>10mil) ±1.2mil(pad size≤12mil);±10%(pad size≥12mil)
12 Width/Space Internal Layer 1/2OZ:3/3mil 1/2OZ:3/3mil
1OZ: 3/4mil 1OZ: 3/4mil
2OZ: 4/5.5mil 2OZ: 4/5mil
3OZ: 5/8mil 3OZ: 5/8mil
4OZ: 6/11mil 4OZ: 6/11mil
5OZ: 7/14mil 5OZ: 7/13.5mil
6OZ: 8/16mil 6OZ: 8/15mil
7OZ: 9/19mil 7OZ: 9/18mil
8OZ: 10/22mil 8OZ: 10/21mil
9OZ: 11/25mil 9OZ: 11/24mil
10OZ: 12/28mil 10OZ: 12/27mil
External Layer 1/3OZ:3.5/4mil 1/3OZ:3/3mil
1/2OZ:3.9/4.5mil 1/2OZ:3.5/3.5mil
1OZ: 4.8/5mil 1OZ: 4.5/5mil
1.43OZ(positive):4.5/7 1.43OZ(positive):4.5/6
1.43OZ(negative ):5/8 1.43OZ(negative ):5/7
2OZ: 6/8mil 2OZ: 6/7mil
3OZ: 6/12mil 3OZ: 6/10mil
4OZ: 7.5/15mil 4OZ: 7.5/13mil
5OZ: 9/18mil 5OZ: 9/16mil
6OZ: 10/21mil 6OZ: 10/19mil
7OZ: 11/25mil 7OZ: 11/22mil
8OZ: 12/29mil 8OZ: 12/26mil
9OZ: 13/33mil 9OZ: 13/30mil
10OZ: 14/38mil 10OZ: 14/35mil
13 Dimension Tolerance Hole Position 0.08 ( 3 mils)
Conductor Width(W) 20% Deviation of Master
1mil Deviation of Master
Outline Dimension 0.15 mm ( 6 mils) 0.10 mm ( 4 mils)
Conductors & Outline
( C – O )
0.15 mm ( 6 mils) 0.13 mm ( 5 mils)
Warp and Twist 0.75% 0.50%
14 Solder Mask Max drilling tool size for via filled with Soldermask (single side) 35.4mil 35.4mil
Soldermask color Green, Black, Blue, Red, White, Yellow,Purple matte/glossy
Silkscreen color White, Black,Blue,Yellow
Max hole size for via filled with Blue glue aluminium 197mil 197mil
Finish hole size for via filled with resin  4-25.4mil  4-25.4mil
Max aspect ratio for via filled with resin board 8:1 12:1
Min width of soldermask bridge Base copper≤0.5 oz、Immersion Tin: 7.5mil(Black), 5.5mil(Other color) , 8mil( on copper area)
Base copper≤0.5 oz、Finish treatment not Immersion Tin : 5.5 mil(Black,extremity 5mil), 4mil(Other
color,extremity 3.5mil) , 8mil( on copper area
Base coppe 1 oz: 4mil(Green), 5mil(Other color) , 5.5mil(Black,extremity 5mil),8mil( on copper area)
Base copper 1.43 oz: 4mil(Green), 5.5mil(Other color) , 6mil(Black), 8mil( on copper area)
Base copper 2 oz-4 oz: 6mil, 8mil( on copper area)
15 Surface Treatment Lead free Flash gold(electroplated gold)、ENIG、Hard gold、Flash gold、HASL Lead free、OSP、ENEPIG、Soft gold、Immersion silver、Immersion Tin、ENIG+OSP,ENIG+Gold finger,Flash gold(electroplated gold)+Gold finger,Immersion silver+Gold finger,Immersion Tin+Gold finge
Leaded Leaded HASL
Aspect ratio 10:1(HASL Lead free、HASL Lead、ENIG、Immersion Tin、Immersion silver、ENEPIG);8:1(OSP)
Max finished size HASL Lead 22″*39″;HASL Lead free 22″*24″;Flash gold 24″*24″;Hard gold 24″*28″;ENIG 21″*27″;Flash gold(electroplated gold) 21″*48″;Immersion Tin 16″*21″;Immersion silver 16″*18″;OSP 24″*40″;
Min finished size HASL Lead 5″*6″;HASL Lead free 10″*10″;Flash gold 12″*16″;Hard gold 3″*3″;Flash gold(electroplated gold) 8″*10″;Immersion Tin 2″*4″;Immersion silver 2″*4″;OSP 2″*2″;
PCB thickness HASL Lead 0.6-4.0mm;HASL Lead free 0.6-4.0mm;Flash gold 1.0-3.2mm;Hard gold 0.1-5.0mm;ENIG 0.2-7.0mm;Flash gold(electroplated gold) 0.15-5.0mm;Immersion Tin 0.4-5.0mm;Immersion silver 0.4-5.0mm;OSP 0.2-6.0mm
Max high to gold finger 1.5inch
Min space between gold fingers 6mil
Min block space to gold fingers 7.5mil
16 V-Cutting Panel Size 500mm X 622 mm  ( max. ) 500mm X 800 mm ( max. )
Board Thickness 0.50 mm (20mil) min. 0.30 mm (12mil) min.
Remain Thickness 1/3 board thickness 0.40 +/-0.10mm( 16+/-4 mil )
Tolerance ±0.13 mm(5mil) ±0.1 mm(4mil)
Groove Width 0.50 mm (20mil) max. 0.38 mm (15mil) max.
Groove to Groove 20 mm (787mil) min. 10 mm (394mil) min.
Groove to Trace 0.45 mm(18mil) min. 0.38 mm(15mil) min.
17 Slot Slot size tol.L≥2W PTH Slot: L:+/-0.13(5mil) W:+/-0.08(3mil) PTH Slot: L:+/-0.10(4mil) W:+/-0.05(2mil)
NPTH slot(mm) L+/-0.10 (4mil) W:+/-0.05(2mil) NPTH slot(mm) L:+/-0.08 (3mil) W:+/-0.05(2mil)
18 Min Spacing from hole edge to hole edge 0.30-1.60 (Hole Diameter) 0.15mm(6mil) 0.10mm(4mil)
1.61-6.50 (Hole Diameter) 0.15mm(6mil) 0.13mm(5mil)
19 Min spacing between hole edge to circuitry pattern PTH hole: 0.20mm(8mil) PTH hole: 0.13mm(5mil)
NPTH hole: 0.18mm(7mil) NPTH hole: 0.10mm(4mil)
20 Image transfer Registration tol Circuit pattern vs.index hole 0.10(4mil) 0.08(3mil)
Circuit pattern vs.2nd drill hole 0.15(6mil) 0.10(4mil)
21 Registration tolerance of front/back image 0.075mm(3mil) 0.05mm(2mil)
22 Multilayers Layer-layer misregistration 4layers: 0.15mm(6mil)max. 4layers: 0.10mm(4mil) max.
6layers: 0.20mm(8mil)max. 6layers: 0.13mm(5mil) max.
8layers: 0.25mm(10mil)max. 8layers: 0.15mm(6mil) max.
Min. Spacing from Hole Edge to Innerlayer Pattern 0.225mm(9mil) 0.15mm(6mil)
Min.Spacing from Outline to Innerlayer Pattern 0.38mm(15mil) 0.225mm(9mil)
Min. board thickness 4layers:0.30mm(12mil) 4layers:0.20mm(8mil)
6layers:0.60mm(24mil) 6layers:0.50mm(20mil)
8layers:1.0mm(40mil) 8layers:0.75mm(30mil)
Board thickness tolerance 4layers:+/-0.13mm(5mil) 4layers:+/-0.10mm(4mil)
6layers:+/-0.15mm(6mil) 6layers:+/-0.13mm(5mil)
8-12 layers:+/-0.20mm (8mil) 8-12 layers:+/-0.15mm (6mil)
23 Insulation Resistance 10KΩ~20MΩ(typical:5MΩ)
24 Conductivity <50Ω(typical:25Ω)
25 Test voltage 250V
26 Impedance control ±5ohm(<50ohm), ±10%(≥50ohm)

PCBTok 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 PCBTok and offers very competitive rates to customers of PCBTok.
It normally takes 3-7 business days for the package to be delivered around the world.


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.


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.


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.


5. Air, Sea/Air, and Sea

If your order is of large volume with PCBTok, 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.

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 a credit card: Visa, Visa Electron, MasterCard, Maestro.

Quick Quote
  • “One of the amazing manufacturers out there is PCBTok. They will do all the necessary means to help you with your desired board outcome despite its complexity. Also, they will provide timely progress updates to your products to ensure they perfectly align with my expected output. I didn’t feel any worries during my business with them as they constantly reassured me with my orders. I am glad I made the right purchase from them; PCBtok is the best!”

    Frank Freeman, Project Engineer from Coquitlam, British Columbia
  • “I’ve been to different manufacturers before I found PCBTok, and they are the only ones who excel the most. Our previous PCB suppliers surrendered to our demands, saying they could not perform it. But when we presented it to PCBTok, they worked it out immediately, and it was superb; I haven’t detected any blemishes on it during my use. At that point, I decided to change my primary supplier to PCBTok; they’re worth it. They will do everything they can to satisfy your needs using every means. They are a very much recommended manufacturer for me.”

    Lawrence Mcfarland, Electronics Professional from Ballarat, Victoria
  • “I have nothing negative against PCBTok because they surpassed my expectations; all of my products are perfectly well, and their services are the most professional. During my transaction with them, I got paired with a dedicated assistant to aid me throughout the purchase. The expert personnel I got were very respectful, courteous, and accommodating to my needs. Also, she consistently updates me regarding the progress of the products. We shared some ideas and insights about it every time I received an update to improve the product. It was very relaxing to have a companion who is an expert in the field; thus, I’d like to thank Ms. M for assisting me professionally throughout our transaction.”

    Cameron Vaughn, Supply Chain Director from Chelmsford, England
Design of Multilayer Flex Circuit Boards

One of the reasons why Multilayer Flex PCB is widespread among different applications is because of its higher component density. Thus, we’d like to share with you its design.

The board’s design is one of the contributing factors that make a product beneficial to the consumers; hence, knowing its layout can help you understand how this happens.

Generally, this particular board comprises eight (8) conductive layers with resistive foils. It enhances its flexibility through surfaces that is left unbonded. They are built to offer better performance and excellent efficiency at a smaller footprint.

As a result, various compact design devices, such as smartphones, cameras, and tablets, have shown their interest in this board due to its efficient performance.

Stack-up of Multilayer Flex PCB

In order to have additional circuitry on the board, a PCB Stack-Up is essential. Then, it will be possible with the help of various PCB Panel layers.

As mentioned previously, this particular board comprises at least three to eight conductive layers that are compressed for a much simpler-looking design.

To put it simply, the Multilayer Flex PCB has a stack-up composed of multiple single-sided copper clad laminates (CCL), adhesive + coverlay (CVL) pressed against each other. As for its wirings, it is connected through a Plated-Through Hole.

We are meticulous in stacking this specific board to satisfy particular design specifications. Additionally, due to their many layers, they need a more careful manufacturing procedure than Single-Sided Flexible and Double-Sided Flexible PCBs.

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