What is Fr4 Material

fr4 material

With the dynamic changes in the field of electronics and PCB fabrications, choosing the most suitable material for your design rut is essential. Modern electronics often employ FR4, a material that offers robust solutions to numerous PCB problems. Artist 3D’s FR4 material has an excellent performance in the electronics sector. Its widespread use in printed circuit boards and other electrical insulating applications has contributed to its popularity. We will also review the many applications of FR4 material and its features, benefits, applications, and drawbacks.

What is FR4 Material?

FR4 is a typical composite epoxy laminate material found in printed circuit boards. It is a glass-reinforced epoxy laminate of electrical grade that is flame retardant, heat resistant and has excellent electrical insulation capabilities. FR4 fabricates high-frequency printed circuit boards due to their renowned high dielectric strength and thermal stability. Additionally, it is resistant to most solvents, acids, and bases.

Categories of FR4 Material

  • Grade 1 FR4 is the highest grade and often helps fabricate printed circuit boards. It is highly resistant to moisture and chemicals and possesses exceptional flame-retardant qualities. As it can endure high temperatures and severe electrical fields, grade 1 FR4 is commonly suitable for high-voltage applications.
  • Grade 2 FR4 is less flame retardant than Grade 1, yet it can still help for various purposes. For example, grade 2 FR4 is often useful in manufacturing consumer electronics and home appliances since it is less expensive than Grade 1 and still possesses excellent flame-retardant qualities.
  • Grade 3 FR4 is the least flammable of the three grades and is typically useful in applications where it will not experience high temperatures or electrical fields. In addition, grade 3 FR4 is less expensive than the other two categories, yet it still provides heat and flame resistance.
  • Grade 4 FR4 is a highly treated variant of Grade 3 intended for higher temperature applications, including high voltage switchgear and automotive components. In addition, grade 4 FR4 has enhanced flame retardant qualities, making it a perfect material for applications requiring a substance that can endure high temperatures and electrical fields.

Advantages of FR4 material

what is fr4 material

The following FR4’s features make it a better choice over other similar materials:

  1. Excellent Mechanical Strength:

 The mechanical strength of FR4 material is exceptional. It can endure the tremendous forces applied during soldering and wave soldering. Additionally, it is resistant to mechanical shock and vibration, making it appropriate for usage in hostile conditions.

  • High Heat Dissipation:

FR4’s high thermal conductivity aids in the effective removal of heat from components. This aspect keeps the PCB cooler and prevents overheating of the elements.

  • Low Coefficient of Thermal Expansion:

The rate at which FR4 material expands or contracts when exposed to temperature variations is low. This characteristic makes it an excellent material for applications requiring components to be stable in various settings.

  • High Flame Retardant Properties:

FR4 material possesses excellent flame-retardant properties. In addition, this material is very resistant to catching fire, making it appropriate for usage in situations containing combustible substances.

  • Highly adaptable:

The FR4 material is highly adaptable and can be helpful in several applications, including printed circuit boards and electronic components. Additionally, it can be cut, drilled, and routed to produce intricate designs.

  • Durable:

The FR4 material is highly resilient and can survive high temperatures, collisions, and other forms of physical stress. It is also corrosion-resistant, making it acceptable for use in corrosive situations.

  • Easy to handle:

The FR4 material is relatively straightforward to manipulate. It can be easy to cut, rout, drill, and shape it without specialist equipment or tools. You can also weld, paste, and laminate it to form intricate designs.

Drawbacks to FR4 material

Besides the numerous advantages, the material has a few demerits such as:

  1. Pricey:

 Compared to similar materials like polyimide or polyethylene terephthalate, FR4 is a comparatively expensive material (PET). In addition, FR4 gets more expensive as its thickness rises. Therefore, it is challenging to employ for applications that need thicker boards.

  • Low thermal resistance:

When compared to other materials, FR4 has a low thermal resistance. This aspect may restrict the pace at which the board’s components work and the amount of power loss due to dissipation.

  • Limited moisture resistance:

FR4 does not naturally resist moisture. Although it can be easy to coat it to increase its resistance to humidity, this can raise the price of the board.

  • Low dielectric strength:

When compared to other materials, FR4 has a comparatively low dielectric strength. This may restrict the voltage provided to the board and increase its susceptibility to failure.

  • Hard to repair:

FR4 is a challenging material to fix. Soldering components back onto a damaged board may be challenging, and the entire board may need replacement.

Current FR4 Material Trends

  1. Increasing reliability:

 As technology develops, FR4 materials’ dependability is rising as well. This achievement results from the excellent durability and fire resistance of more recent FR4 models.

  • Increasing usage of halogen-free materials:

Due to their improved fire safety and environmental friendliness, halogen-free materials have recently gained popularity. As a result, the industry is increasingly using halogen-free FR4 materials.

  • Increasing usage of low-loss materials:

Since low-loss materials can lower signal losses in high-speed circuits, their demand has increased. As a result, printed circuit boards and other electronics applications use low-loss FR4 materials more frequently.

  • Better thermal performance:

When compared to other materials, FR4 materials have better thermal performance. This feature is advantageous in settings with high temperatures, including those in the automobile and aerospace industries.

  • Lower costs:

 FR4 materials are now less expensive thanks to better manufacturing techniques and expanding material availability. This aspect increased the availability and affordability of FR4 materials for various applications.

The uses of FR4 material

fr4 material PCB
  1. Printed circuit boards:

Due to its superior mechanical and electrical insulating qualities, FR4 material is most helpful in making printed circuit boards (PCBs). It serves as the substrate or base material in the creation of PCBs.

  • Insulation:

Owing to its superior electrical insulation qualities, FR4 is nowadays an insulation material in high-voltage electrical equipment. High-voltage coils, motors, transformers, and other electrical apparatus are all used for insulation.

  • Automotive Components:

Due to its high-temperature resistance and mechanical strength, FR4 makes automotive components like radiator tanks and engine components.

  • Electrical/Electronic Enclosures:

Because of its superior electrical insulating qualities, FR4 is utilized to create electrical/electronic enclosures such as switchgear, control panels, and junction boxes.

  • Telecommunications:

With its superior electrical insulating qualities and high-temperature tolerance, FR4 is currently finding applications in vast telecommunications equipment.

  • Aerospace:

Due to its outstanding electrical insulating qualities and high-temperature resistance, FR4 helps make aerospace components.


FR4 is an excellent option for many different kinds of electronic projects. As a result of its high mechanical and electrical qualities, it is widely used in electronic components. Furthermore, it’s a safe bet for many uses due to its minimal water absorption, good thermal stability, and lack of flammability. In addition, our FR4 material is cheap, simple to make, and straightforward to put together. To sum up, Artist 3D’s FR4 material is a fantastic option for anyone needing dependable and practical material for their electrical projects because of its many benefits.

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