What Maximum Temperature Can the Printed Circuit Board Withstand

Printed Circuit Boards are a vital component of electronic devices. They’re used in a variety of electrical instruments and devices. Temperature resistance is one of the most important properties. So what is the optimum temperature that the PCB board can withstand? Let’s look at the PCB temperature resistance.

Common Materials and Their Temperature Resistance Limits

1. Product FR-4
   FR-4, a glass-fiber reinforced epoxy product, is frequently used in PCB manufacturing.
   The temperature resistance for FR-4 is usually around 130°C.In practical applications, it is mainly suitable for conventional environments where the continuous operating temperature ranges from 90°C to 110°C. Exceeding this level can cause the board to deform or fail. FR-4 materials have been extensively used by the high-end electrical industry for many years due to their low production costs, excellent price performance and easy processing. For high-temperature application, however, the resistance to temperature of FR-4 materials is not sufficient.

2. High-Temperature FR-4 Material
   To compensate for the shortcomings of standard FR-4 at high temperatures, engineers have developed High-Tg materials specifically designed for extreme environments.
   A high-temperature PCB is generally defined as a laminate with a glass transition temperature (Tg) exceeding 170°C (some industry standards set the threshold at 150°C).
   Such materials offer higher reliability at elevated temperatures and can withstand sustained mechanical stress without easy degradation. Commonly used high-performance high-temperature materials in the industry include ISOLA IS410, ISOLA IS420, ARLON 85N and VT-901.
   High-temperature FR-4, a glass-fiber-reinforced epoxie product, is specially designed for high temperature environments.
   High-temperature FR-4 is a glass fiber reinforced epoxy product that has been specially designed for high temperature environments.
   High-temperature FR-4 has a high production cost, but its reliability at high temperatures is much greater than that of FR-4. It is therefore widely used in the electrical industry.

3. Polyimide Product
   Polyimide, a high-performance protective product, has exceptional properties such as high-temperature resistant, chemical degradation resistance, electromagnetic wave interference and others.
   It is one the best high-temperature resistant materials available, with heats exceeding 380°C. Very few brands can endure temperatures above 500°C. Polyimide is used in aerospace, military, and temperature measurement instruments with high precision. Polyimide materials are expensive, but their durability at high temperatures makes them unbeatable.
   The PCB temperature resistance can be as high as 500°C, or even higher, depending on what product is used on the board. Electrical tools and meters are generally made of FR-4 or high temperature FR-4 material, which is able to meet the needs of most applications.