Complete Comparison Guide to FR4 PCB and Aluminum PCB


Many people need clarification in understanding an FR4 PCB and Aluminum PCB, which results in having a hard time deciding which board material is better. Consequently, we’d like to address this confusion in this article by providing all the factual information about them.

Introduction to FR4 vs. Aluminum PCB

Introduction to FR4 vs. Aluminum PCB

Essentially, Aluminum PCBs are constructed of a metal substrate with a layer of dielectric substance, whereas FR4 is a fiberglass substance with epoxy resin. Each PCB form has certain benefits and characteristics so that they may be used for various applications.

In this discussion, we will explore the differences between these two types of PCBs to help you determine which is best for your project. Furthermore, we will touch on the advantages and applications of each kind. Read until the end to learn more about them.

What is an Aluminum PCB?

A PCB with an Aluminum Metal Core Layer, commonly called a Metal Core PCB (MCPCB), serves as a heat sink to remove heat produced by the electrical components on the board. A layer of dielectric material, a covering of copper circuitry inscribed into the substrate, and the metal core layer are all wedged between each other.

What is an Aluminum PCB?

An Aluminum PCB often uses a thermally conductive dielectric substance, like epoxy resin loaded with ceramic, to help transmit heat from the components to the metal core. Only the necessary connections and pads remain after the copper circuitry on top of the dielectric layer has been printed using a photoresist technique and etched away with an acidic medium.

Furthermore, Aluminum PCBs are frequently used in high-power lighting systems, aerospace and automotive industries, power supply, and other electronic equipment that call for effective heat dispersion. Depending on the purpose, the metal core layer can comprise several alloys. Aluminum is the most prevalent due to its affordability and superior heat conductivity. Other metals like steel or copper can also be employed in specific applications that need stronger thermal conductivity or durability.

Benefits of an Aluminum PCB

Compared to conventional FR4 PCBs, Aluminum PCBs provide several advantages, along with the following factors.

  • Excellent Thermal Conductivity: The metal core layer of an Aluminum PCB acts as a heat sink, which allows it to dissipate heat much more efficiently than FR4 PCBs. This is especially important in high-power applications.
  • Enhanced Mechanical Strength: The metal core layer of an Aluminum PCB provides additional mechanical strength and stability, making it less prone to warping or bending. This is particularly important for applications where the PCB will be exposed to high levels of vibration or shock.
  • Improved Reliability: The use of a metal core layer in an Aluminum PCB provides better thermal stability, which can help reduce the risk of component failure due to temperature cycling or thermal stress.
  • Cost-Effective: Aluminum PCBs may be slightly more expensive than FR4 PCBs, but they are still a cost-effective option for many applications, especially when compared to more exotic materials such as Ceramic PCBs.
  • Design Flexibility: Aluminum PCBs can be designed in various shapes and sizes, making them ideal for applications with unique requirements or space constraints.

When to Use an Aluminum PCB?

Typically, Aluminum PCBs are used in electronic devices that require efficient heat dissipation, high power, and reliability. Below are some common applications where Aluminum PCBs are used.

  • LED Lighting: Simply put, high-power LED lighting fixtures generate a significant amount of heat, which can affect the lifespan and performance of the LED. Aluminum PCBs are commonly used in LED lighting to help dissipate heat and improve overall reliability.
  • Automotive And Aerospace: Aluminum PCBs are frequently used in the automotive and aerospace industries, where high power and reliability are essential. They are commonly found in power electronics, engine control units, and other critical components.
  • Power Supplies: Basically, power supplies require efficient heat dissipation to ensure stable performance and reliability. Aluminum PCBs are an excellent choice for power supply applications because they handle high power and heat levels.
  • High-Performance Computing: In general, high-performance computing applications generate a significant amount of heat, which can cause damage to components and reduce system performance. Aluminum PCBs are used in these applications to help dissipate heat and improve system reliability.

In particular, Aluminum PCBs are an excellent option for any electronic equipment that needs effective heat management, high power, and dependability. Consider employing an Aluminum PCB if the application necessitates high-power components or produces a lot of heat to guarantee the longevity and efficiency of the product.

What is FR4 PCB?

A typical form of PCB seen in various electrical products is the FR4 PCB. The quality of the flame-retardant epoxy composite substance that composes the panel is referred to as FR4. In the interest of safeguarding the copper traces from degradation and other environmental variables, FR4 PCBs are made up of a thin layer of copper wiring inscribed into the base of the FR4 substrate.

What is FR4 PCB?

In addition, a woven fiberglass cloth and epoxy resin are the main components of the glass fiber-reinforced epoxy composite known as FR4. Along with that, excellent mechanical and electrical features, such as high strength, longevity, and low dielectric loss, are provided to the PCB by this material composition.

Across a broad spectrum of electronic circuits, from straightforward consumer electronics to complex aerospace and military applications, FR4 PCBs are often employed. They are an affordable solution for many uses. Due to their flexible form, they may be used in various devices of various dimensions and shapes.

Advantages of FR4 PCB

Although the Aluminum PCB has gained the upper hand regarding capabilities, the FR4 PCB has.

  • Cost-Effective: FR4 PCBs are a cost-effective option for most applications, as the materials used to manufacture them are widely available and relatively inexpensive.
  • Good Thermal Stability: FR4 PCBs have good thermal stability, which means they can withstand a wide range of temperatures without degrading or becoming brittle.
  • High Mechanical Strength: FR4 PCBs have excellent mechanical power, which makes them less prone to warping or breaking. This is particularly important for applications where the PCB will be exposed to high levels of vibration or shock.
  • Good Electrical Insulation: The FR4 material used to manufacture the PCB has a high electrical insulation resistance, which helps to prevent electrical shorts and other issues that can arise from poor insulation.
  • High Dielectric Strength: FR4 PCBs have a high dielectric strength, which means they can withstand high voltages without breaking down or becoming damaged.
  • Good Chemical Resistance: FR4 PCBs resist various chemicals, making them suitable for harsh environments.

Consequently, FR4 PCBs are well-liked for many electronic devices, from modest consumer electronics to complex aerospace and industrial uses. They are a fantastic option for many applications due to their affordability, thermal stability, tensile stability, and electrical insulating qualities.

When to Use FR4 PCB?

It is possible to employ FR4 PCBs in many electrical devices since they are a versatile and popular form of PCB. FR4 PCBs are often used in the applications listed below.

  • Consumer Electronics: FR4 PCBs, such as smartphones, tablets, and laptops, are commonly used in consumer electronics. Their cost-effectiveness and flexibility in design make them an excellent choice for these applications.
  • Industrial Controls: FR4 PCBs, such as Programmable Logic Controllers (PLCs) and automation systems, are commonly used in industrial control systems. Their high mechanical strength and electrical insulation suit harsh industrial environments.
  • Medical Devices: FR4 PCBs are used in various medical devices, from simple diagnostic equipment to complex surgical instruments. Their chemical resistance and high dielectric strength make them suitable for use in medical environments.
  • Aerospace and Military Applications: FR4 PCBs are used in various aerospace and military applications, such as avionics, missiles, and communication equipment. Their high reliability, thermal stability, and mechanical strength suit extreme environments.

FR4 PCBs are often a solid option for any electrical device that needs a budget-friendly, dependable, and versatile PCB. Try to employ an FR4 PCB if your application involves electronic goods, industrial automation, biomedical applications, aeronautical, or military applications to guarantee the long-term functionality and serviceability of the product.

Difference Between FR4 and Aluminum PCB

Many characteristics, such as the ones listed below, distinguish FR4 PCB from Aluminum PCB.

Comparison of Keyboard PCB with FR4, Aluminum, POM, and Polycarbonate Material

  • Thermal Management: The most significant difference between FR4 and Aluminum PCB is their thermal management. Aluminum PCB is better at dissipating heat than FR4 PCB due to its high thermal conductivity, making it ideal for high-power applications.
  • Cost: FR4 PCB is less expensive than Aluminum PCB, making it a popular choice for consumer electronics and low-power applications. However, Aluminum PCB’s price may be justified in high-power applications where efficient heat dissipation is essential.
  • Mechanical Strength: FR4 PCB has better mechanical strength than Aluminum PCB, making it ideal for applications that require a sturdy board, such as automotive and industrial electronics.
  • Conductivity: Aluminum PCB has higher electrical conductivity than FR4 PCB, but it is not always required in most applications.
  • Flexibility: FR4 PCB is more flexible than Aluminum PCB, making it easier to use in applications that require bending or shaping the board.
  • Design Complexity: FR4 PCB can create complex designs with multiple layers, while Aluminum PCB is best suited for simpler designs.
  • Environmental Considerations: FR4 PCB is not environmentally friendly, containing toxic materials like lead and bromine. In contrast, Aluminum PCB is more eco-friendly since it can be recycled easily.

In conclusion, FR4 PCB and Aluminum PCB are ideal for diverse applications due to their unique qualities and capabilities. Aluminum PCB is better for high-power applications that require efficient heat dissipation. At the same time, FR4 PCB is ideal for applications that require good electrical insulation, mechanical strength, and low cost.


In summary, even though there are a lot of similarities between an FR4 PCB and an Aluminum PCB, their applications are quite different; they have unique principles, concepts, characteristics, purposes, capabilities, and uses. In this post, we have covered these highly significant facets in selecting the suitable board for a particular application.

If you want to learn more about FR4 and Aluminum PCB, we at PCBMay are accessible constantly. Also, if you wish to avail of our services, especially our professional opinion about the various electronic circuit boards, we can greatly help you.

Please do not delay any longer; there’s no need to worry about availing of our products since we always ensure that they are of the premium quality in the market. Moreover, we always provide they follow the strict quality standard guidelines through various inspections. Contact us today!

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