Polyimide film has extremely high heat resistance, which is its key feature as a high-temperature insulating material. Generally speaking, the decomposition temperature of polyimide film is around 500°C, and the thermal decomposition temperature of some specific synthetic polyimides can even reach 600°C. This excellent high-temperature resistance enables polyimide film to maintain stable physical and chemical properties in high-temperature environments, thereby ensuring its reliability and safety in various high-temperature applications.
In addition to high-temperature resistance, polyimide film also has excellent chemical stability. It can resist the erosion of a variety of chemical solvents and weak acids, and will not degrade due to chemical corrosion. This chemical stability is crucial for insulation applications in high-temperature environments, because high temperatures are often accompanied by various chemical reactions and corrosion processes, and the chemical stability of polyimide film can ensure that it can still maintain stable insulation performance under these harsh conditions.
In the aerospace field, polyimide film is widely used in thermal protection systems and electrical systems of aircraft. Since aircraft face extremely high temperatures and pressures when flying at high altitudes and high speeds, an insulating material that can withstand these extreme conditions is needed. Polyimide film has become an ideal choice in the aerospace field due to its excellent high temperature resistance and chemical stability.
In the field of electronics, polyimide film is used as an insulating layer in integrated circuits. As the integration of integrated circuits continues to increase, the requirements for insulating layers are also getting higher and higher. Polyimide film has excellent dielectric and insulating properties, which can meet the high requirements of large-scale and ultra-large-scale integrated circuits for insulating layers. At the same time, its high temperature resistance also ensures the stability and reliability of integrated circuits in high-temperature working environments.
In the field of new energy vehicles, polyimide film is used as a battery separator. With the popularization and development of new energy vehicles, the requirements for battery performance are also getting higher and higher. Polyimide film has excellent high-temperature flame retardant properties and chemical stability, which can effectively improve the energy density and safety of the battery. In battery systems under high-temperature working environments, the insulating properties of polyimide film are crucial to prevent internal short circuits and failures in the battery.
In addition to the above fields, polyimide film is also widely used in other insulation applications in high-temperature environments. For example, in industrial high-temperature dust removal filter materials, polyimide film can withstand the erosion and corrosion of high-temperature flue gas and maintain stable filtration performance; in fireproof materials, the high-temperature resistance and flame retardant properties of polyimide film make it an important fire barrier.