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PCB Materials Selection Guide: Types, Properties & How to Choose

Table of Contents

The PCB materials play a critical role in determining the electrical performance, thermal reliability and service life of electronic products. Selecting the right PCB materials involves design, cost and manufacturability decisions that directly affect product success.
This article provides a practical guide for the selection of right PCB materials but if you want to avoid costly delays and mistakes in the PCB design process, it’s best to acquire some expert advice right from the start.
ELE PCB is here to fulfil all of your PCB material needs.

Basic Composition of PCB​

Basic composition of a typical PCB

PCB Materials are chosen based on their electrical and thermal qualities, which are essential for the board to function according to the design rating. The form factor and the number of layers on the board are both determined by the schematic. A sophisticated PCB, at least, will have following layer composition,

Substrate Layer: It is the main insulating and supporting material layer for the whole PCB. The thickness of this substrate layer, which provides a sturdy base for printed circuit boards, varies depending on the intended purposes of the board.

Conductive Layer: In most cases, the PCB is fabricated by depositing a very thin layer of a metal such as copper on the surface of the insulating material.

Solder Mask Layer: It is an additional layer on the top of conductive layer. Contacting pads on PCB need this insulating layer to prevent shorts to other conductive components.

Silkscreen Layer: This layer of printing epoxy is used for printing symbols or any informative text on solder mask. A silkscreen can be used to read cautionary signals, identify parts, and determine assembly locations.

Properties of PCB Materials

When the high-quality PCB materials are used to fabricate a printed circuit board, not only will it function properly, but it will also survive for the lifetime of the product. Following are some important properties of PCB materials.

  • Electrical Conductivity: Conductive metal normally have high conductivity to reduce the resistance of tracks. Copper is the main used conductive material having good electric conduction properties which do not require any further explanation.
  • Thermal Conductivity: Substrate material should have low thermal conductivity constant. This PCB material should help in NOT spreading the heat of one electrical component to nearby components.
  • Flexibility and Strength: PCB material needs to be rigid and mechanically a little flexible as during operation the material can be prone to effect of thermal elongation and should not develop cracks causing traces to break.

Substrate is the only major PCB material that is considered the backbone of entire PCB as it has to provide support and some extra thermal efficiency.  From hereafter, we will focus on the substrate as the main PCB material.

Common Types of PCB Material

PCB manufacturing relies heavily on the careful selection and integration of PCB materials. While there are literally hundreds of various materials from which to pick depending on budget and technical needs, some of the most common PCB materials are listed here.
  • Cellulose Based Composite Materials: CEM-1, CEM-2, CEM-3, CEM-4, CEM-5
  • Glass Reinforced Epoxy Laminate Materials: FR-1, FR-4, FR-5
  • Teflon Based Materials: PTFE
  • Polymer Materials: Polyimide
  • Metallic Materials: Alumina

FR1 & FR2

These Fire-Retardant materials are utilised only for single layer PCB and is fabricated using paper and phenol chemicals.
The glass transition temperature is the only distinguishing feature between FR1 and FR2. FR1’s Tg is greater than that of FR2’s glass transition state.

FR-4

FR-4 is a composite material that is flame resistant. It is made of woven fiberglass fabric that has an epoxy resin acting as the binder.
It does not absorb water but maintains a high mechanical strength and maintains an excellent insulating capacity regardless of the surrounding conditions, whether they are dry or wet. This PCB material is particularly common for printed circuit boards that have lower layer counts, such as single-sided, double-sided, or multilayered structures that have less than 14 layers.

Polyimide

The temperature endurance of polyimide laminates is superior to that of FR-4 materials, and they also exhibit a minor increase in their electrical performance characteristics. Polyimide materials are more expensive than FR-4 materials, but this PCB material offers enhanced endurance in hostile and higher temperature conditions. As a result of their improved stability during thermal cycling and reduced tendency towards expansion, these materials are well suited for structures with a greater number of layers.

Teflon (PTFE)

Teflon possesses outstanding electrical characteristics for PCB, which makes it well suited for use in high-speed circuits applications. Teflon material is more costly than polyimide. PCBs made of Teflon can also be coated with fabric glass other additives to increase their mechanical strength. In many cases, the production of Teflon based PCBs calls for a workforce with a specific set of skills, specialized equipment, and procedures.
FR-4 PCB material

Considerations to Select Best PCB Material

It is critical to carefully select the best type  of PCB material to ensure that the PCB has the appropriate electrical, thermal, and mechanical characteristics for durable application. While selecting appropriate PCB material, consider following characteristics in mind.

Design Requirements​

Think through the PCB’s intended use, intended environment, signal integrity requirements, and overall design.

Do high temperatures need to be tolerated? Is a stiff or pliable board better for your needs? One thing that matters the most is that the PCB material should be insulating.

PCB Thickness

Basically, the thickness depends on the project you’re working on; printed circuit boards, for example, frequently employ the thinnest boards. PC board thickness reduces stress. Ideal FR-4 thickness would be close to 1 to 3 inches. Grooves are impossible to implement on thin FR-4 circuit boards because of the risk of cracking, and the grooves themselves cannot be too big.

Impedance matching

Impedance or frequency matching is crucial for low-frequency or high-frequency printed circuit boards in electrical and electronic equipment. Paying closer attention to those details would make the boards more logical and safer to operate. It can also provide information on the capacitance of multisided boards.

Spacing

Space conservation is a key consideration when constructing FR-4 printed circuit boards. Spacing is crucial for Bluetooth gadgets and USB ports. For designing, we mostly used the thinnest boards.

Flexibility

Due to their flexibility, thin boards were more commonly employed in manufacturing than thick ones. When utilizing FR-4, there is a significant risk if the substrate is very thin, and the FR-4 PCB’s area or dimensions are greater. Stress can be reduced in thin FR-4 PC boards used in electrical and electronic devices. Thinner boards are more pliable and heat sensitive. It may be bent to a desired angle while soldering.
Flexible FR-4 PCB

Weight

For smaller or lighter items, FR-4 PCB thickness will determine its weight, and vice versa. Although weight is less of a concern in other applications, it is typically something that is thought about when designing consumer electronics. PCBs that are lighter lead to goods that are lighter, which in turn makes the items cheaper to ship and, in certain situations, more appealing to customers.

Operating Temperature & Thermal Performance

When it comes to a PCB’s durability and performance, power and heat are two of the most important aspects. Be sure to check the thermal capabilities of the PCB material you’re considering for the actual design.
  • FR-4 is suitable for most standard applications with moderate temperature requirements.
  • High-Tg FR-4 or polyimide materials are preferred for high-temperature, multilayer, or mission-critical designs.
For power electronics, materials with enhanced heat dissipation may be required.

Mechanical Durability & Strength

It’s crucial to think about the PCB materials’ mechanical and electrical durability.
  • Thicker boards generally offer better mechanical strength but less flexibility.
  • Thinner boards are lighter and more flexible but may be prone to warping or cracking if improperly designed.
  • For multilayer or HDI boards, low CTE materials help maintain reliability during thermal cycling.

Cost

When selecting PCB material, its cost factor is considered to be most crucial.
  • FR-4 remains the most cost-effective and widely available PCB material.
  • Excellent performance is offered by polyimide and PTFE materials, but the costs of the materials and processing are increased significantly by them.

How to Select Suitable Materials for Your Boards

The table below provides a more intuitive guide for selecting PCB materials by comparing several common materials in terms of their typical applications, performance advantages and cost. This helps to quickly narrow down suitable material options during the early design phase.
PCB Material Typical Applications Key Advantages Limitations Relative Cost
FR-4 (Standard) Consumer electronics, industrial control, general-purpose PCBs Low cost, good mechanical strength, flame retardant, widely available Higher signal loss at high frequencies, limited high-temp performance Low
High-Tg FR-4 Multilayer PCBs, HDI boards, automotive electronics Improved thermal stability, better reliability in thermal cycling Slightly higher cost than standard FR-4 Low–Medium
Polyimide Aerospace, automotive, high-temperature environments Excellent thermal endurance, low CTE, stable multilayer performance Expensive, more complex manufacturing High
PTFE (Teflon) RF, microwave, high-speed digital circuits Low dielectric constant, low signal loss, excellent signal integrity High cost, difficult to machine and process Very High
CEM-1 / CEM-3 Single or double-sided PCBs, low-cost electronics Economical, easy fabrication Limited electrical and thermal performance Very Low
Metal Core (MCPCB) Power electronics, LED lighting, motor drives Superior heat dissipation, high mechanical strength Limited routing flexibility, higher weight Medium–High
As shown above, there are distinct differences in performance and cost between the various PCB materials. FR-4 remains the preferred choice for most general-purpose electronics, whereas polyimide and PTFE materials offer distinct advantages in applications involving high frequencies, high temperatures or high reliability.
When it comes to practical projects, selecting the right PCB material requires a comprehensive evaluation of factors such as layer count, impedance control requirements, manufacturing capabilities and volume costs. Over-specifying may increase manufacturing costs, while insufficient material performance could compromise product reliability.
If you are uncertain which PCB material best suits your design, consulting an experienced PCB manufacturer early in the design phase can mitigate risks effectively and shorten the development cycle.

ELEPCB: The Leading Printed Circuit Board Manufacturing Factory

Selecting the right PCB material is essential for ensuring reliable performance, long-term durability and cost-effective manufacturing. FR-4 remains the most widely used material due to its balanced performance and cost, but polyimide and PTFE are often necessary for applications involving high frequencies, high temperatures or harsh environments.
Prototyping printed circuit boards is a useful technique for designers since it helps save time and money while guaranteeing a high-quality result. Get in touch with ELE Company Limited right away if you need PCB prototype services for an upcoming venture.
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Benjamin
About Benjamin

Benjamin is the general manager of ELE PCB, a leading PCB design and manufacturing company based in China. He has over 10 years of experience in the PCB industry, and has been involved in various projects.

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