What is Copper Foil
Copper foil is a thin sheet of copper metal characterized by exceptional ductility and electrical conductivity, along with resistance to chemical corrosion. Consequently, it finds extensive applications across various fields of daily life. Among the most familiar uses are the manufacturing of circuit boards and certain electronic components.
The production of copper foil involves casting, rolling, and processing. After copper is melted and cast into copper plates, it undergoes rolling under specific temperatures and pressures to form extremely thin copper foil. This foil is then further processed to create the desired product, such as imparting a flat matte or glossy finish. Finally, it is rolled into various sizes according to your application requirements.
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What are the Properties of Copper Foil?
Thin and Lightweight: As demonstrated by the characteristics of copper foil, it is a lightweight material that will not add extra weight to your device.
Corrosion Resistant: Although we describe copper foil as a corrosion-resistant material, this property actually stems from copper’s inherent susceptibility to oxidation and corrosion. If you are with a background in chemistry, you may know that after oxidation, a layer of verdigris or basic copper carbonate forms on the surface of copper, coating the material.
This substance has a dense texture and stable properties, making it less reactive with external elements. It also protects the underlying copper material from further oxidation, thereby extending its service life.
Of course, in more extreme environments, GALLOP INNOTEK still recommends using coated copper foil for enhanced protection.
Good Mechanical Properties: Copper foil is a material with excellent ductility and high hardness, making it resistant to deformation or brittleness that could lead to fractures or breakage. Its superior ductility also facilitates easy processing and cutting, ensuring long-term reliability in your products.
High Conductivity: Copper possesses a very low electrical resistivity, allowing current to flow through it with ease. Consequently, copper foil is widely used in the manufacturing of circuit boards, and in the meantime, provides effective electromagnetic shielding.
What are the Copper Foil Types?
Depending on the Manufacturing Process
Rolled Copper Foil
Rolled copper foil refers to copper material that is repeatedly rolled and processed through physical means. Copper ingots are rolled down to the desired thickness. Copper foil produced through this process exhibits excellent flexibility and is easily bendable.
Electrolytic Copper Foil
Electrolytic copper foil refers to the process of converting copper raw materials into a copper sulfate solution, which is then electroplated into copper foil using electrolytic equipment under direct current. It is widely used in high-frequency and high-speed digital circuits.
According to the Thickness
l Thick Copper Foil (greater than 70μm)
l Standard Copper Foil (greater than 18μm and less than 70μm)
l Thin Copper Foil (greater than 12μm and less than 18μm)
l Ultra-Thin/Extremely Thin Copper Foil (less than 12μm)
Based on Surface Treatment Methods
l Single-sided processed copper foil
l Double-sided processed copper foil
l Smooth-finished copper foil
l Double-sided smooth copper foil
l Ultra-low profile copper foil
GALLOP INNOTEK has over a decade of professional experience, providing you with high-quality products. We welcome your inquiries.
Factors to Consider When Choosing the Copper Foil
Purity
Copper foil typically has a purity of 99.5% or higher. You can understand that the higher the purity, the better the performance. This is because higher purity enhances the electrical conductivity and reduces electrical issues caused by impurities.
Thickness
This is related to physics-related knowledge. Generally, the greater the thickness, the higher the resistance. The thickness of copper foil also affects PCB heat dissipation, so you must carefully consider this when making your selection.
Surface Roughness
The surface roughness of copper foil affects its bonding strength with insulating materials and its solderability. The smoother the surface, the easier it is for the copper foil to adhere to different materials, and enables a longer-lasting use.
Coefficient of Thermal Expansion
The coefficient of thermal expansion is a critical factor in electronic applications that cannot be overlooked. It generally refers to the dimensional change of a material in response to changes in temperature. The smaller this change, the less impact it has on the equipment. Therefore, careful consideration based on specific application requirements is essential during selection.
What are the Applications of a Copper Foil?
Electronics field
Copper foil is primarily used in the electronics industry, with applications including printed circuit boards, lithium-ion batteries, and electromagnetic shielding. It serves as a critical component in the manufacturing of printed circuit boards (PCBs), while PCBs are important to an electronic device, too.
It also functions as an effective electromagnetic shielding solution, ensuring the proper operation of equipment. Furthermore, owing to its exceptional electrical conductivity and thermal conductivity, copper foil is frequently employed as a thermal interface material within devices.
Constructions and Decorations
Copper foils are also used a lot in building and architecture. It can be very easily shaped, bent, cut, and twisted. Due to its unique metallic luster and medium properties, it is used in building materials and decorations and is widely popular in the construction and decoration industry for its professional-looking and beautiful varieties, serving both indoor and outdoor use, including all kinds of walls, doors, and windows.
Food and Medicine Package
Copper foil also plays a vital role in the food and pharmaceutical packaging industries. It provides superior moisture resistance, oxidation protection, and antimicrobial properties, ensuring product quality and safety.
What is the Production Made by Copper Foil?
Copper foil can also be used to produce various products such as copper foil tape, copper foil sheets, and copper foil stained glass. Copper foil tape and copper foil sheets are primarily applied in electromagnetic shielding.
They leverage copper’s electrical conductivity to achieve shielding effects, finding widespread use in mobile phones, laptops, and other digital devices. Users can simply affix it to components requiring shielding to isolate harmful electromagnetic waves from the human body while maintaining device functionality.
Copper foil stained glass finds primary application in architecture and decoration, such as attaching fine copper foil strips to glass edges to create intricate and aesthetically pleasing patterns.
Copper Foil Area & Weight Planner
Estimate net copper area and mass from foil dimensions, thickness and order quantity.
Planning/reference estimate: Uses copper density of 8,960 kg/m³. Slitting, edge trim, plating/coating, adhesive, liner and defects are not included.
In terms of electrical conductivity, copper foil may hold an edge. Statistics show that aluminum’s conductivity is less than 66% of copper’s for the same volume. Moreover, copper foil’s corrosion resistance can support decades of use, whereas aluminum foil may not last as long.
Well, as for the price, aluminum foil may be slightly cheaper. However, when considering the lifespan and overall cost, copper foil appears to be the more cost-effective choice. Of course, if your budget is limited and the product or equipment isn’t expected to have a very long service life, aluminum foil is also a suitable option.
At the same time, copper is heavier than aluminum for the same volume. If your product has specific weight requirements
In industrial production, thinner copper foil typically translates to superior electrical performance. For instance, in circuit board manufacturing, it enables finer processing and reduces signal transmission delays. Moreover, thinner copper foil is lighter in weight, leading to higher overall energy density when used in batteries.
However, copper foil cannot be excessively thin. Overly thin foil is prone to cracking during production, rolling, or recycling, which can actually increase internal resistance.
GALLOP INNOTEK employs copper foil of optimal thickness, ensuring superior product performance.
In PCB production, copper is the primary raw material due to its exceptional electrical and thermal conductivity. This property enables PCB to dissipate heat effectively during operation, thereby preventing equipment damage due to overheating. Conversely, if another alloy, such as aluminum or tin, is used, the heat from the PCB may not be evenly dissipated, which can lead to the malfunctioning of the PCB.
As mentioned earlier, to enhance the performance of the material, we can apply various coatings to a copper foil.
One such material that can be produced with this technique is carbon-coated copper foil. Copper foil is made from a seal with Copper as the substrate and a composite of carbon black and resin, created through a special process. Copper-coated foil has higher conductivity and better anti-corrosion properties. It is extensively used in the fabrication of electronic devices, including high-frequency circuits, oscillators, filters, power amplifiers, hyper-frequency modules, and monolithic integrated microwave circuits.
As a specialized manufacturer, GALLOP INNOTEK can provide you with high-quality nanocarbon-coated copper foil.
