Flexible PCB

The commonly used PCB is rigid after that board is flex PCB which is mostly used in different electronic devices and projects. Currently, this board is commonly accessible and can be used in any project.

Why choose FS Technology Flexible PCB Boards​​

Through the service of FS Technology, you will get better quality and cheaper flexible PCB boards. The following reflects our manufacturing capabilities:

  • Specialize in flexible PCBs with 1-6 layers, and the maximum acceptable size is 610 mm×1650 mm. If your project has additional needs, we will try our best to try.
  • Surface treatment services provided include: HASL, Lead-free HASL, Immersion gold, Immersion tin, Immersion Silver, Plated gold, OSP, Carbon ink, ENEPIG, and Gold Finger.
  • FS Technology has an independent production and assembly workshop, which can provide cheaper FPC for your project without MOQ requirements.
  • Our fast turnaround service can provide you with an expedited package to complete PCBA prototyping in as fast as 1-2 days.
  • Obtaining a flexible board needs to follow the Gerber file format like ALL Gerber Files、POWERPCB、PROTEL、PADS2000、CAD、AUTOCAD、ORCAD、P-CAD、CAM-350、CAM2000 etc.

Flexible PCBA Manufacturing Capability

Available materialsPolyimide, high Tg polyimide
Material thickness25µm-50µm
copper thickness18µm-35µm
Minimum hole diameter0.004″
Drill Aspect Ratio35:1
Minimum trace/space0.003″/0.003″
Drilling technologyBlind/Buried vias and Microvias
Impedance controlYes (10% tolerance)

Flex PCB Manufacturing Capability

FS Technology uses subtractive, additive or semi-additive FPC manufacturing processes to fulfill customer orders.

In a subtractive process, a turnkey manufacturer selectively removes unwanted copper foil from the surface of a copper clad laminate to establish a circuit image. Because it can reduce costs, and the process is mature and reliable, it is respected by PCB manufacturers and has become mainstream.

The additive process of flexible PCB refers to the method of electroless plating by the manufacturer to electroplate the circuit diagram on the PCB substrate that originally had no circuit pattern. FS Technology uses this process in flexible circuit boards with higher circuit density, but because this method is “additive”, the cost is high and the technology is immature, so it is not commonly used.

The semi-additive method is another form of additive process. This PCB manufacturing process uses ultraviolet light to cure the film, and uses electroplating technology to increase the copper thickness of the line to the thickness required by the customer. Finally, the excess copper layer under the photoresist is removed by flash etching to obtain the desired circuit pattern. It’s a new way to keep up with the evolution of electronic devices. Using this method, the copper thickness is not affected by the width of the line, and a flexible board with a minimum line width/line spacing of 14 μm/14 μm and a minimum aperture of 55 μm is produced.

Flex PCB Finishing Capability

The manufacture of the FPC is only the first step in a turnkey service. Surface preparation is usually required for fragile circuit boards to ensure that the circuit boards are in good assembly condition. Immersion Gold, Immersion Tin, Immersion Silver will not be the only options in surface treatment services. In addition to technical advantages, the provision of free conformal paint service in small batch prototype manufacturing orders is one of the factors that FS Technology has received well.

The combination of electronic components and assembly techniques enables endless possibilities for your flexible projects. FS Technology not only provides traditional SMT assembly and through-hole assembly, but also flip-chip technology that inverts the chip and connects directly to the substrate is also an option.

FS Technology has a complete quality management system. Inserting PCBA testing in the assembly process is a must for the factory, including free manual visual inspection and AOI testing. In addition to these basic tests on flexible PCBA boards, ICT, flying probe testing, and X-ray testing must also be required for your electronic project.

The Benefits of Buying Flexible PCBs for Electronics Projects

The technology used for flexible boards also called FPC or Flexible printed circuit and make grown in different fields of life such as electronics, wearables, telecommunications aviation. Usually flexible PCBAs exist in the form of single-layer boards, and higher-density boards such as 8-layer, 10-layer or 16-layer are also produced according to the needs of the project.  If you choose FS Technology as your turnkey FPC supplier, we are capable of supplying all types of flexible PCBs with the following characteristics:

  • Use smaller and lighter substrates for flexible circuit board creation, measuring approximately 0.004 inches. Considering space and area, it is more suitable for complex circuits than other boards.
  • With a unique pressure processing function, when the assembled flexible PCB is subjected to external force, the components on the board will not shift.
  • If it is combined with the rigid board the resultant boards come called rigid-flex boards to give both features of two boards. That is to say, it not only makes up for the weakness of the flexible board, but also makes up for the inflexibility of the rigid board.
  • Compared with other boards, it can reduce the risk of construction errors and repairs, and provide protection for the advancement of the project.
  • This board comes with the feature of easy airflow that cools the circuits of the board.
  • The modification in the structure of the board makes sure to construct the complicated structures and designs with it also has features to make connections at its corners.

Advantages of Flexible PCB​

The price advantage of flexible PCBA

Price Advantage

The price drivers of PCBA include: material, size, structure and purchase volume, etc. This also means that the finished product seller can increase the profit of the project through these aspects. Under the same conditions, the price of the circuit board is: rigid < flexible < rigid-flex, but from the perspective of the use of PCBA materials, FPC board uses fewer materials and components. In terms of manufacturing materials, more manufacturers choose to use polyimide materials that are less expensive. In terms of PCBA components, due to the global economic downturn and the shortage of component supply, the price of chip components has skyrocketed. In terms of personnel, the circuit board can be built with fewer technicians.

Application Scenario Advantages

Facing the environment of high-voltage and high-temperature circuits, customers will choose IMS PCBA with good thermal management performance, but this circuit board with metal layer as the inner layer obviously cannot meet the customer’s needs for complex circuits, which makes flexible boards the first choice. In some severe cases, the circuit board with poor heat dissipation will produce harmful chemicals, and the flexible PCB board has a certain resistance. Flexible PCB is made of polyimide or polyester film as the base material, which makes it have better thermal stability. When electronic products face the threat of high temperature, it rarely occurs in the physical phenomenon of thermal expansion and contraction. These boards have features to operate on any type of connectors used in electronics especially has compatibility with the ZIP connectors.

Application scenarios of FPCB
Flexible PCB saves space for circuits

Size Advantage

As a foldable circuit board, flexible PCB can not only provide three-dimensional space design freedom for projects, but also improve space utilization and weight efficiency in equipment. These boards require less area and lighter weight, and through the use of space, allow them to provide better functionality in full-featured large-scale projects. In small, reliable, and consistent circuits and projects, it can also be installed in places where rigid circuit boards cannot because it uses fewer connectors and uses fewer interconnects.

Applicable Fields of Customized Flexible PCBA

Flexible printed circuit board is considered to be the main part of any electronic device, it can be applied to various types of electronic products, such as computers, computer keyboards, cameras, mobile phone circuits, etc. FS Technology has been in the PCB manufacturing and assembly industry for ten years, and we know from customers who buy flex PCBs that they are in a variety of industries, including the computer and medical industries. The use of flexible PCBA is not limited to this, its use is very extensive, and we will introduce you to some use cases.

Flexible PCBs are created over in different manufacturing projects in industries such as robots design are created on this board. HMI machines layout is also configured over the boards. Machines used in shopping malls such as bar code readers also have these boards with the processing devices created over the boards.

These boards are commonly used for GPS systems the vehicle’s enginers control systems are manufactured over that boards. Currently, in new cars, there is latest breaking system is installed that is called the Antilock brake system used in the boards for creation. Airbags used in cars created through the help of these boards.

In the medical industry, hearing instruments and heartbeat sensors are created around him.

Different types of electric components such as active and passive devices are designed through the use of these boards such high towers lights circuits are designed on flex boards. Satellite station devices and circuits are created on the flex PCB. Resistors and capacitors are created to use these boards for different circuits like ripples and filters circuit.

Flex PCB vs Rigid PCB

Where flexible are better than rigid

  • High reliability and small footprint
  • Better thermal management
  • Easy to repair
  • The flexible PCB is used for high-speed operation where rigid is not used

Where flexible are worse than rigid 

  • Flexible PCB manufacturing process is more complex and requires longer manufacturing time than rigid PCB
  • Price comparison under the same conditions: Rigid-flex PCB > Flexible PCB > Rigid PCB


So far, FS Technology’s flexible PCB manufacturing capabilities have been demonstrated. Simply put, choose FS Technology and you can get this PCBA board at a lower price that can be easily modified and reshaped, and make electrical connections easier. As a leading turnkey PCBA assembly company in China, FS Tech aims to meet the needs of PCB manufacturing customers using various materials and technologies, unswervingly adhering to customer quality and certification standards. 

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