What maximum temperature can the Printed Circuit Board withstand?

Printed Circuit Board is a very important part of the electronics industry, often used in a variety of
electrical equipment and instruments. One of the core properties is temperature resistance. So What
maximum temperature can the PCB board withstand? Let's take a closer look.

Firstly, PCB temperature resistance performance.

The temperature resistance performance of the Printed Circuit Board means that in a high-temperature
environment, the board will not appear embrittlement, cracking, deformation, and other phenomena.
Therefore, the temperature resistance of the board is very important.

Under normal circumstances, The temperature resistance performance of PCB processing is affected by many
factors such as material, manufacturing process, circuit structure and so on. Among them, the material
is the main factor affecting the temperature resistance of the PCB board.

Secondly, the temperature resistance performance of commonly used materials of PCB board.

1. FR-4 material

FR-4 is a glass fiber-reinforced epoxy material commonly used in PCB manufacturing. The temperature
resistance of FR-4 material is usually about 130°C, and exceeding
this temperature will cause deformation or failure of the board.

Due to the advantages of low manufacturing cost, high cost performance, and good processability, FR-4
materials are also widely used in the high-end electrical industry and have been tested by long-term
practice. However, for high-temperature applications, the temperature resistance of FR-4 materials is
not enough.

2. High-temperature FR-4 material

High-temperature FR-4 is a glass fiber-reinforced epoxy material specially designed for high-temperature
environments. Compared with FR-4 materials, high-temperature FR-4 materials have better temperature
resistance and can withstand temperatures of up to 150°C or more.

Although the manufacturing cost of high-temperature FR-4 is high, its reliability in high-temperature
environments is far better than the general FR-4, so it has been widely used in the high-end electrical
equipment industry.

3. Polyimide material

Polyimide is a kind of high-performance insulating material, with excellent high-temperature resistance,
chemical corrosion resistance, electromagnetic wave interference, and other characteristics. It is one
of the most excellent high-temperature resistance materials on the market, which can withstand high
temperatures above 380°C, and very few brands of polyimide
materials can even withstand high temperatures above 500°C.

At present, polyimide materials are mainly used in aerospace, military, and high-precision temperature
measurement equipment. Although polyimide materials are expensive, their reliability at high
temperatures is unmatched by other materials.

In summary, the PCB resistance temperature can reach a maximum of 500°C or more, depending on the material used on the board. In general
electrical equipment and meters, we commonly use FR-4 or high-temperature FR-4 materials, which can meet
most of the application needs. However, in some special applications, such as aerospace, military, and
other industries, it is necessary to use high-performance materials such as polyimide.

Therefore, when selecting PCB board materials, it is necessary to select the material type and
temperature resistance level according to the actual application to ensure that the circuit board has
good reliability and stability in a high-temperature environment.