FR4 PCB is a class of printed circuit board base material made from a flame retardant epoxy resin and glass fabric composite.

FR4 has the characteristics of high dielectric strength, high strength-to-weight ratio,moisture resistant ,withstand a certain high temperature,low cost.

Our Fabrication highlights:


What is FR4 PCB Board?


A print circuit board with FR4 is called the FR4 printed circuit board. It is a printed circuit board that essentially uses the FR4 sheets.
At first, the FR4 is used in the insulating layer of the circuit board. Then, we add a copper layer on either side of the FR4 sheet.
As a result of this, it becomes CCL (Copper Clad Laminate). Due to FR4, CCL acts as an insulating material.
It is then used in manufacturing FDR PCB boards
The FR4 gives PCB boards a strength. Moreover, they are great at absorbing moisture and resisting fire.
Therefore, these boards are very popular in the market.

Features of FR4 to Consider When Choosing FR4 PCB

When choosing or ordering FR4 printed circuit board, an electrical engineer or technician must look at the following features:

  • Thickness:

The thickness of an FR4 sheet varies depending on your project. Ideally, you will require an FR4 with a thickness of 1.3 thou to 3 inches.

  • Impedance Matching:

The impedance matching is very important in high-frequency PCBs. It helps to maintain the function of the board of directors. It also determines the capacitance of the layers in multi-layered boards.

  • Space & Flexibility:

Depending on your project, you can choose an FR4 material for your PCB boards. Mostly, people prefer thinner sheets as they take less space and are more flexible.

  • Weight of the FR4:

Since, the thickness of the board determines its weight. For lighter products, choose FR4 boards with lighter weight.

  • Thermal Conductivity:

To determine the temperature management of the FR4, look at the value of the thermal coefficient of the dielectric constant. However, FR4 is heat resistant and it is one of the main reasons for its popular use.

Other benefits of FR4 materials include:
  • FR4 is a low-cost alternative to other similar materials
  • It has a high dielectric strength which helps its electrical insulation properties.
  • The material is lightweight and has a high strength-to-weight ratio.
  • It is moisture resistant and has relative temperature resistance as well.
  • FR4 is water resistant and is suitable for various PCB applications.
  • Standard Fr4 PCB thickness is only about 0.2 to 3.2 mm

All these properties make it ideal in a variety of environments.

Additional information

PCB Item

Manufacture Capacity

Layer Counts


Base Material

High Frequency(Rogers,Taconic,Aron,PTFE,F4B)

Material Thickness(mm)


Max board size(mm)


Board Outline Tolerance


Board Thickness


Thickness Tolerance


Minimum line/space


Min Annular Ring


SMD Pitch


Min Hole Size(mechanical)


Min Hole Size(laser hole)


Hole Size Tol(+/-)


Hole Position Tol




Immersion Gold

Nickel 3-7um Au:1-5u"

Surface Finish

HAL,ENIG,Plated Gold,Immersion Gold,OSP

Copper Weight


Solder mask

Green, Blue,Black,White, Yellow, Red, Matt Green, Matt Black, Matt Blue

Slk screen

White, Black, Blue,Yellow

Acceptable File Format

Gerber fle,Powerpcb,CAD,AUTOCAD,ORCAD,P-CAD,CAM-350,CAM2000