A 2-layer flexible printed circuit board (PCB) is a type of PCB. that consists of two conductive layers separated by a flexible insulating material. Flex PCBs designed to provide flexibility, allowing them to bend. and twist to fit into various applications with space constraints. or requiring complex geometries. 2-layer flex PCB has two conductive layers. typically referred to as the top layer and bottom layer. These layers connected through vias or plated through holes (PTHs). to establish electrical connections between them.

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  • More than 10 years of flexible PCB manufacturing experience;
  • Provide with 1-10 layer flexible circuit board fabrication service;
  • Comply with ISO9001 & IPC level 2 or 3 standards
  • Provide fast turn multilayer flexible PCB prototype services;
  • The thickness of the multilayer FPC is 0.05-2.5mm, and the copper thickness is 1/3oz-2oz;
  • Supply 7*24 hours of sales, technical, and after-sales service support.

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Increased Design Flexibility

flexibility pcb fpc Gesflex circuit

The primary benefit of a flex PCB is its flexibility. Unlike rigid PCBs, flex PCBs can bend, twist, and conform to different shapes and spaces. This allows for greater design flexibility and the ability. to fit into tight or irregularly shaped spaces. It is particularly advantageous in applications. where space limited or where the PCB needs to integrated into movable or flexible parts.

Size and Weight Reduction

4 LAYER FLEX PCB- EMI Shielding and Signal Isolation

Flex PCBs are typically thinner and lighter compared to their rigid counterparts. The flexible substrate used in flex PCBs eliminates the need for bulky and rigid interconnects. which leads to significant size and weight reductions. This makes flex PCBs ideal for applications. where weight and space savings are crucial. such as portable electronics, wearables, and miniaturized devices.

Improved Reliability

4 LAYER FLEX Enhanced Power Distribution

Flex PCBs offer improved reliability due to the absence of solder joints and connectors. which are common sources of failure in rigid PCBs. The flexible nature of the PCB eliminates the need for connectors. resulting in fewer points of failure and improved signal integrity. Additionally, flex PCBs can withstand vibrations, shocks. and repetitive bending without compromising their performance or structural integrity.

Enhanced Signal Integrity

4 LAYER FLEX PCB-Improved Signal Integrity

The flexible substrate in flex PCBs provides excellent electrical characteristics. including low dielectric constant and loss, which can improve signal integrity. The shorter signal paths and reduced parasitic capacitance. and inductance of a 2-layer flex PCB can help minimize signal distortion, crosstalk. and electromagnetic interference (EMI). resulting in better overall performance and higher data transfer rates.

Cost Savings

4 LAYER FLEX PCB Better Thermal Management

While the initial cost of flex PCB fabrication may be higher compared to rigid PCBs. flex PCBs can lead to cost savings in the long run. The compact size and reduced weight of flex PCBs can result in lower material and shipping costs. Additionally, the elimination of connectors, reduced assembly time, and simplified interconnections. That can contribute to cost savings in the production and assembly processes.

Design Versatility

flexible pcb Space Efficiency

Flex PCBs offer greater design versatility compared to rigid PCBs. They designed to fit into three-dimensional spaces. conform to non-planar surfaces, or follow complex geometries. This flexibility opens up possibilities for innovative and creative product designs. allowing engineers to explore new form factors and product architectures.


2 LAYER FLEX PCB stackup

The stackup of a 2-layer flex PCB refers to the arrangement of layers and materials used in its construction. Here’s a typical stackup for a 2-layer flex PCB:

Top Layer:

The top layer of the flex PCB consists of a conductive copper trace pattern. This layer carries the signal and power traces that connect the components and circuitry.

Adhesive Layer:

On top of the top copper layer, there is a layer of adhesive. This adhesive provides bonding between the copper layer and the flexible substrate. ensuring mechanical stability and electrical continuity.

Flexible Substrate:

The flexible substrate forms the core of the flex PCB. It is typically made of a flexible insulating material, such as polyimide (PI) or polyester (PET). The substrate provides the necessary flexibility for the PCB to bend and twist. It also acts as an insulator between the top and bottom layers. preventing electrical shorts.

Adhesive Layer:

Like the top layer, there is another adhesive layer above the flexible substrate. This adhesive layer ensures proper bonding between the substrate and the bottom copper layer.

Bottom Layer:

The bottom layer consists of a conductive copper trace pattern. It serves as the bottom conductor layer, carrying additional signal and power traces. The bottom layer is also connected to the top layer through vias. or plated through holes (PTHs) to establish electrical connections between the layers.



Single-sided Flexible PCB

This is the simplest and most basic type of flexible PCB. It consists of a single conductive layer on a flexible substrate. Components and traces placed on one side of the substrate. and the other side is typically used for protective covering or shielding.


Double-sided Flex PCB

Double-sided flexible PCBs have conductive layers on both sides of the flexible substrate. Components and traces placed on both sides. allowing for increased circuit density and more complex designs.



Multilayer Flexible PCB

Three or more conducting layers separated by insulating layers make up multilayer flexible PCBs. In comparison to single or double-sided flexible PCBs. they offer increased circuit density and more complicated interconnecting choices. 


Rigid-Flex PCB

Rigid-flex PCBs combine elements of both rigid PCBs and flexible PCBs. They consist of rigid sections and flexible sections. allowing for both mechanical support and flexibility within a single board. 




The material used for the flexible substrate in a 2-layer flex PCB is a critical component. that provides the required flexibility and insulation. The most commonly used materials for flexible substrates in flex PCBs are:

Polyimide (PI):

Polyimide is a popular choice for flexible substrates. due to its excellent thermal stability, mechanical strength, and electrical properties. It can withstand high temperatures and offers good chemical resistance. PI-based flex PCBs are commonly used in applications where reliability and durability are crucial. such as aerospace, automotive, and medical devices.

Polyester (PET):

Polyester, also known as polyethylene terephthalate. That is another widely used material for flexible substrates. PET-based flex PCBs offer good flexibility, low cost, and ease of processing. However, they may have slightly lower temperature resistance compared to polyimide. PET-based flex PCBs are commonly used in consumer electronics. such as mobile phones and wearables, where cost-effectiveness and flexibility are important.

Liquid Crystal Polymer (LCP):

LCP is a high-performance thermoplastic material that offers excellent mechanical strength. dimensional stability, and electrical properties. LCP-based flex PCBs have low moisture absorption and are resistant to high temperatures. They are often used in applications that require miniaturization. high-speed data transfer, and high-frequency signals, such as telecommunications and RF/microwave devices.

PTFE (Polytetrafluoroethylene):

PTFE is a fluoropolymer known for its excellent electrical properties. including low dielectric constant and low loss tangent. PTFE-based flex PCBs are suitable for high-frequency and high-speed applications. such as radar systems, aerospace, and telecommunications.

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flexible pcb board manufacturing process-design

Step1: Design and Material Selection:

The first step is to design the circuit and determine the specific requirements for the 2 layer flex PCB. This includes deciding on the number of layers. stack-up configuration, trace routing, component placement, and material selection.

Step2: Material Preparation:

The chosen flexible substrate material, typically polyimide. That supplied in rolls or sheets and undergoes a cleaning process. to remove any contaminants that could affect the bonding. or adhesion of subsequent layers.

flexible pcb board manufacturing process-material prepartion
flexible pcb board manufacturing process-copper cladding

Step3: Copper Cladding

The polyimide sheets coated with a layer of copper. This involves laminating a thin layer of copper foil. onto the polyimide surface using heat and pressure. The copper etched to remove excess material, leaving behind the desired copper traces.

Step4: Imaging and Etching

A photoresist applied to the copper layer. and the circuit pattern transferred onto it using a photomask and UV exposure. The exposed areas are then chemically etched. removing the unwanted copper, and leaving behind the desired circuit traces.

flexible pcb board manufacturing process-etching
flexible pcb board manufacturing process-drilling

Step5: Drilling and Plating

Small holes called vias drilled through the polyimide. and copper layers at specific locations to provide interconnections between different layers. The vias are then plated with a conductive material. such as copper or electroless nickel to ensure electrical continuity.

Step6 : Lamination

The individual layers, including the conductive layers and insulating layers. stacked together and laminated under heat and pressure. An adhesive layer, often made of epoxy, Used to bond the layers together. This process forms a 2-layer structure with the desired stack-up configuration.

flexible pcb board manufacturing process- lamination
flexible pcb board manufacturing process-Coverlay

Step7 : Coverlay Application

A coverlay, which is a protective layer made of polyimide, applied on top of the circuitry. It bonded to the flexible PCB using heat and pressure. The coverlay protects the circuit traces from environmental factors and provides insulation.

Step 8 : Surface Finishing

The exposed copper pads on the outer layers plated with a surface finish. such as electroless nickel immersion gold (ENIG). to protect them from oxidation and facilitate soldering during assembly.

flexible pcb board manufacturing process-surface finishing
flexible pcb board manufacturing process-testing

Step 9 : Testing and Inspection

The manufactured 2 layer flexible PCB undergoes testing and inspection. to ensure it meets the required specifications and quality standards. This includes electrical testing, impedance measurement, visual inspection. and possibly other specific tests depending on the application.

Step 10 : Assembly and Integration

The completed 2 layer flex PCB is then integrated into the electronic device or assembly. Components soldered onto the board. and any additional mechanical or electrical connections made as necessary.

flexible pcb board manufacturing process-assembly

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