Complete Introduction to Copper Foil PCB


Copper foil is a very important part of a PCB. The copper foil facilitates the movement of charges and signals inside the device and is used for tracking the paths.

Electronics known as copper foil PCBs are utilized in a variety of applications where extremely sensitive circuits and power are required. The printed circuit boards with copper foil employ a technique for adding copper traces to the board’s surface using conductive ink.

The copper foil traces are usually made by electroplating, sometimes called electrodeposition, where a thin layer of copper is deposited on a substrate by anodic oxidation.

What is a Copper Foil's Role On a PCB

Copper Foil On a PCB

What is a Copper Foil’s Role On a PCB?

Copper foil is used in printed circuit boards to provide continuity between components and to prevent electromagnetic interference from affecting the circuit.

The main role of copper foil in a PCB is to provide continuity between components and to prevent electromagnetic interference from affecting the circuit.

Copper foil is a very thin metal sheet that has a wide range of applications. Therefore, a PCB serves as an electrical conductor in this instance.

Copper foils are typically sold in rolls that are pre-cut into rectangles by the manufacturer. Unquestionably, this larger roll will let you use more at once and will leave less waste when you’re done with your project.

Understanding the Layers of a Copper Foil PCB for a Better Manufacturing Process

Copper Foil PCB manufacturing is a complex process that requires precision and attention to detail. An error in any step of the process could result in a faulty PCB, which would be highly problematic for you and your customers. To avoid this outcome, it’s important to understand what happens at each step of the manufacturing process.

PCB’s Substrate Material

Substrate Material

PCB’s Substrate Material

In order to make the best PCBs, you need the right substrate material. A substrate is what your circuit boards will be printed on, and in the case of PCBs, this means it’s the base upon which other components are built.

The substrate material you choose has a direct impact on how your board looks and performs. For example, if you want your PCB to be flexible or lightweight, then copper-clad FR4 would be a good choice for you. If you need something that is flame retardant, then glass-reinforced epoxy would be ideal. If you want something that can withstand extreme temperatures or long-term exposure to moisture, then polyimide film may be your best bet.

PCB Lamination


PCB Lamination

PCB laminate is a thin thermoset or thermoplastic film used to protect the printed circuit board and increase its electrical insulation. The PCB laminate is a thin layer of resin that protects the electronics on the board from electromagnetic interference, corrosion, and mechanical damage.

The two most common types of laminate are polyester and epoxy. Polyester is used for high-temperature applications, while epoxy is used for low-temperature applications such as consumer products.

Laminating machines apply a thin layer of plastic film to one side of the substrate using a roller or metering pump. In an injection molding machine equipped with a mold, the laminate is usually cut out with heated knives and a die-cutting head.

PCB Silkscreen

The silkscreen printing process uses a silk screen mesh made from fine stainless-steel wires to apply ink to the PCB surface.

To apply ink, ink up each hole in the mesh with an ink roller, and then press the screen onto a sheet of paper that has been previously coated with a thin layer of emulsion. The emulsion dries and adheres to the mesh, which can then be peeled off, leaving only those areas where ink was applied exposed through holes in the mesh.

PCB silkscreen is a kind of protective layer for PCB, which is applied on the surface of the PCB by silkscreen or laser engraving technology. The silkscreen can be positive or negative. The silkscreen has many functions: it can protect the soldermask from damage; it can improve the stability of PCB; it can make the components more visible; it can make the soldering part more beautiful and easier to be soldered.

PCB Soldermask

Soldermask is a layer of paint that covers the electrical circuitry on a printed circuit board. The soldermask serves two main purposes: it protects the copper traces from oxidation and corrosion, and it provides a way for you to identify where the traces are so that you can solder them together to form an electrical connection.

The soldermask also prevents solder from flowing over exposed copper and creating solder bridges, which would short out an electrical connection between two points on the board.

Metal Foiling

Metal Foiling

Metal Foiling of a PCB

This is the process of applying a thin layer of metal to a non-metallic surface, like paper or plastic. Copper metal foils are made of copper and come in sheets or rolls.

There are two main types of metal foils: dielectric and conductive. Dielectric metal foils can be used in capacitors and other electronic components, but they will not conduct electricity. Conductive metal foils are used for electrical wiring or for shielding purposes.

In addition to its use as a conductor, the metal foil is also used as a barrier between different layers of a PCB. The metal foil acts as an insulator when placed between two different layers with different electrical properties, preventing short circuits from occurring during assembly processes such as soldering or wave soldering.

Determining the Thickness of Copper Foil

The Thickness of Copper Foil

Determining the Thickness of Copper Foil

Determining the thickness of the copper foil is a fairly straightforward process, but it’s important to get it right.

Copper foil is one of the most common materials used in the manufacturing of electronics.  The process of electroplating is used to make printed circuit boards, which are used in everything from computers to cell phones and other consumer electronics. Copper foil also plays a role in the manufacturing of electronic components like circuit breakers and transistors.

As such, it’s important that you’re able to measure the thickness of your copper foils with precision. If you don’t have an accurate measurement, your PCBs could end up too thick or too thin—either of which could cause them not to work correctly or even stop working altogether!

4 Types of Copper Foil PCB

The best way to understand how a copper foil PCB is made is to look at the different types of copper foil that are used for the process. Each type has its own characteristics that make it more or less suitable for certain applications.
When it comes to copper foil PCBs, there are four major types. These are the following:

  • Electrodeposited Copper Foil PCB
  • Surface-treated Electrodeposited Copper Foil PCB
  • Rolled-annealed Copper Foil PCB
  • Low-profile Copper Foil PCB

Electrodeposited Copper Foil PCB

Electrodeposited Copper Foil

Electrodeposited Copper Foil PCB

One of the most essential components in PCBs is the conductive material of the printed circuit board. The PCB production process depends on this material, so if you’re looking to get your hands on some electrodeposited copper foil, you’ll want to know exactly where and how to get it!

A thin layer of copper has been deposited onto a substrate using an electrolytic deposition. This method allows them to be more flexible than traditional copper wire or solder, making them ideal for use in printed circuit boards.

When this process is applied to PCBs, it provides a low-cost alternative to traditional methods such as soldering. It also allows for increased efficiency by reducing waste materials during manufacturing processes.

Surface-treated Electrodeposited Copper Foil

Surface-treated Electrodeposited Copper Foil

Surface-treated Electrodeposited Copper Foil PCB

These copper foil PCBs are made with a copper foil that has been treated to improve its adhesion to the dielectric material. The treatment also acts as an oxidation barrier to prevent corrosion.

The main benefit of surface-treated electrodeposited copper foil PCBs is their long life expectancy and resistance to corrosion. The main drawback is that they are more expensive than other types of PCBs.

The surface-treated electrodeposited copper foil has been shown to be an effective way to improve the corrosion resistance of copper foil current collectors and the electrochemical performance of lithium-ion batteries.

Rolled-Annealed Copper Foil PCB

Copper foil is manufactured from thick copper ingots by repeated rolling and annealing processes. This process results in a more flexible and stronger product than electrodeposited copper foil. Because rolled-annealed copper is widely used for flexible circuit boards, fine circuit boards, and in fields where high heat resistance, high strength, and high conductivity are required, it is widely used for flexible circuit boards, fine circuit boards, and in fields where high heat resistance, high strength, and high conductivity are required.

Low-Profile Copper Foil

Low-Profile Copper Foil

Low-Profile Copper Foil PCB

Designated AM foil, which refers to its advanced metallurgy. The unique attributes of this foil arise from its unconventional processing approach and the resulting microstructure. An extremely small and uniform grain structure enhances the metallurgy and decreases the foil profile.

A micro-roughening process has been applied to low-profile copper, which is a type of electrodeposited copper. This treatment and modification create very low average roughness. It must be remembered that it is important for adhesion to the substrate. Low-profile copper foils can be used in place of standard copper foils in situations where weight savings are important.

Different Copper Foil PCB Weights

The amount and type of copper used in your PCB affect its performance, especially in terms of conductivity. One of the most important properties to consider when designing electronic components. In summary, the thickness and quality of the copper layers can have a major impact on how well your circuit works. It’s important that you understand what types of copper are available before you start designing your PCB!

You can choose the right copper weight based on the design specifications. To determine the required copper weight, it is important to know how much heat you need to dissipate from your PCB design. A high-heat dissipation design requires more copper than a low-heat dissipation design. It means that you will need to use a heavier gauge of copper foil for your PCB project.

At PCBTok, we use different weights of copper for different types of boards:

  • 5oz copper (18μm or 0.7mil thick)
  • 1oz copper (35μm or 1.4mil thick)
  • 2oz copper (70μm or 2.8mil thick)
  • Other reaches 3oz, 4oz, and 5oz

Copper Foil PCB Features and Characteristics

A copper foil PCB is a type of printed circuit board that is made from copper material.  These boards are used for many different applications, including telecommunications, computers, and automotive applications. They are also used in the medical field to create diagnostic tools and other equipment that requires sensitive electrical signals.

The main advantage of a copper foil PCB is that it is very durable and can withstand high temperatures. This makes it ideal for use in environments where there may be extreme heat or cold present. Additionally, these types of boards do not corrode easily which means they can last longer than some other types of circuit boards.

Which Copper Foil Suits Best to Your PCB?

When you’re designing circuits, you want to make sure that they are as thin as possible. A thin circuit has many advantages. It can be more sensitive and accurate; it’s easier to produce, and it helps with thermal management.

However, if your circuit is too thin, surface roughness will be a big issue. Surface roughness affects copper foil—the thinner the substrate. Undeniably, the more sensitive the circuit will be to the surface roughness of the copper. When the copper planes are really close together, in the case of a really thin laminate, the copper planes have a pretty significant influence. And the roughness does impact the performance a lot.

For very high-frequency applications, the circuit geometry usually needs to be etched very accurately. Thinning the copper can improve this. So if you have a really sensitive design using thin materials, it’s good to know what the average roughness is. Try to understand what to expect for variation of roughness so that you can plan accordingly when designing your circuit!

PCBTok | Reliable Copper Foil PCB Manufacturer

PCBTok is a reliable copper foil PCB manufacturer that specializes in providing high-quality PCBs for a variety of uses. We offer a wide range of services, including small-batch production, prototypes, and full-scale production.

We have been in business for over a decade and work with clients from all over the world. Our customer base includes large companies. As well as small businesses and individuals who require custom copper foil PCBs. We are proud to say that we have quality products and services.

We take pride in our ability to meet all of your needs—whether you need one copper foil PCB or thousands!


Copper foil is an essential component of a PCB. It sets the stage for potential future trouble if it fails to perform correctly. Therefore, it’s essential that with your design. You have to ensure that you have chosen the right copper foil, with optimum material properties to give you reliable performance.

If you’re looking to make PCBs with copper foil, at PCBTok we offer quick and quality service. At PCBTok, we do our best to meet all customer inquiries and deliver high-quality PCBs. Call us now and have your copper foil PCB manufactured with us!

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