What are the different types of PCB copper foil

What are the different types of PCB copper foil

PCB copper foil refers to a thin layer of copper that is laminated onto a substrate material to create a printed circuit board (PCB). It plays a crucial role in the construction of electronic circuits. The copper foil is typically applied to a non-conductive base material, such as fiberglass or a composite resin, through a process called lamination. 

This creates a conductive path that allows electric current to flow throughout the PCB, enabling the functioning of various electronic components. The thickness and quality of the copper foil are important factors that determine the performance and durability of the PCB. There are different types of PCB copper foil. What are they? Keep reading!

Table of Contents

Electrolytic copper foil

Electrolytic copper foil, also called ED copper foil, refers to copper foil made by electrodeposition. The manufacture of electrolytic copper foil for printed circuit boards begins with the production of raw foil. Its manufacturing process is an electrolytic process.

Electrolytic Copper Foil
Electrolytic Copper Foil

Electrolysis equipment generally uses a surface roller made of titanium material as the cathode roller, and uses high-quality soluble lead-based alloy or insoluble titanium-based corrosion-resistant coating (DSA) as the anode. Copper sulfate electrolyte is added between the cathode and anode. Under the action of direct current, metal copper ions are adsorbed on the cathode roller to form an electrolytic original foil. As the cathode roller continues to rotate, the generated original foil is continuously adsorbed on the roller and peeled off. Then it is washed, dried, and wound into a roll of raw foil.

Electrolytic Copper Foil

Rolled copper foil

Rolled copper foil is a thin sheet of copper that has been processed through a rolling mill to achieve its desired thickness. It is commonly used in various industries including electronics, automotive, and construction. Rolled copper foil is highly flexible, making it ideal for applications such as printed circuit boards, electromagnetic shielding, and heat dissipation.

Double-sided treated copper foil

Double-sided treated copper foil is a specialized type of copper foil that has been treated on both sides for various purposes. It is commonly used in electronic applications, such as printed circuit boards (PCBs), to provide a conductive surface for electrical connections. The treatment on both sides of the copper foil helps to improve its adhesion properties, making it easier to laminate onto substrates and ensuring better bonding with other materials during the PCB manufacturing process.

Double-sided Treated Copper Foil
Double-sided Treated Copper Foil

Additionally, the treatment on both sides can enhance the copper foil’s resistance to oxidation, corrosion, and other environmental factors, thus improving its durability and longevity. This type of copper foil is often used in high-frequency applications, where it is essential to maintain signal integrity and minimize any signal losses.

High temperature and high elongation copper foil

High temperature and high elongation copper foil refer to a type of copper foil that has been specifically engineered to withstand elevated temperatures and exhibit increased elongation properties. It is designed to maintain its structural integrity and flexibility even when exposed to high temperatures, making it suitable for various applications where heat resistance and elongation are essential. 

This type of copper foil is commonly used in industries such as electronics, automotive, aerospace, and renewable energy. It is often employed in applications like printed circuit boards (PCBs), heat sinks, electrical connectors, and thermal management solutions. The high-temperature resistance of this copper foil allows it to endure elevated thermal conditions without degradation or loss of performance. Additionally, its high elongation property enables it to withstand mechanical stress and deformation without breaking or tearing.

Low profile copper foil

Low-profile copper foil refers to a type of thin, flexible copper sheet that is commonly used in various industries such as electronics, automotive, and construction. It has a low height or thickness, which makes it ideal for applications where space is limited or weight needs to be minimized. The copper foil is typically made by rolling copper into thin sheets, and it is known for its excellent electrical conductivity, corrosion resistance, and durability. It is often used in electronic devices, like smartphones and printed circuit boards, to provide a reliable pathway for electrical signals. 

The low profile aspect of copper foil makes it easier to handle and ensures a tight fit in compact spaces, allowing for efficient heat dissipation and electrical performance. It can also be easily shaped or cut to meet specific design requirements.

Resin coated copper foil

Resin Coated Copper Foil
Resin Coated Copper Foil

Resin-coated copper foil, also known as RCC foil, is a thin sheet of copper that has been coated with a layer of resin. The resin serves as a protective barrier, providing insulation and preventing the copper foil from oxidizing or corroding. RCC foil is commonly used in various industries, including electronics, automotive, and aerospace, due to its excellent electrical conductivity and durability. It is frequently utilized in applications such as printed circuit boards (PCBs), electromagnetic shielding, and flexible electronics.


PCB copper foil is the initial copper thickness applied on outer and inner layers of a multilayer PCB board.

An electrolytic copper foil is a foil-based form of copper with a thickness generally less than 80m. 

Rolled copper foil, a spherical structured metal foil, is manufactured and produced by the physical rolling method.

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