75μm PI Film | High-Temperature Polyimide Film for Automatic Industry

The PI75 Series is a 75μm thick polyimide (PI) raw film manufactured by Sanfeng Win New Material (Jiangsu) Co., Ltd. It is produced through polycondensation of pyromellitic dianhydride and 4,4'-oxydianiline (ODA) in a solvent, followed by casting, imidization, and stretching processes. The film is supplied in rolls with a standard inner core diameter of 76mm rigid paper tube, featuring neat edges without damage.

The PI75 film has a total thickness of 75μm in accordance with GB/T7125-2014. Its electrical strength averages ≥50 MV/m, with individual values of ≥40 MV/m. The film density is 1420±20 kg/m³, and the relative dielectric constant at 50Hz is ≤3.9.

The PI75 Series polyimide film is widely used in applications requiring high thermal stability and excellent electrical insulation. Common applications include flexible printed circuit boards (FPCs), insulating tapes, motor and transformer slot insulation, electromagnetic wire wrapping, high-temperature-resistant labels, and insulating layers for electronic components. Its reliable dielectric strength and uniform thickness also make it suitable for automotive electronics, and precision electrical equipment where consistent insulation performance is critical.

PI75 polyimide film is trusted across multiple high-reliability industries:

• Electrical Insulation – Layer insulation for motors, transformers, generators, and battery packs. Prevents short circuits at high voltages.
• High-Temperature Masking – Used as a coverlay or protective film during solder reflow, wave soldering, and hot bar soldering processes.
• Automotive – Wire and cable wrapping, thermal shielding, and insulation in engine compartments where temperatures exceed conventional material limits.

Sanfeng Win New Materials (Jiangsu) Co., Ltd. (hereinafter referred to as Sanfeng Win) was established in 2010. It is a private enterprise integrating R&D, production and sales of adhesive products, with industry-leading coating technology and a professional R&D team. The company specializes in the production of high-temperature resistant tapes, optical protective films, new energy battery blue films, aerogel packaging hot-pressing films, photovoltaic perforated tapes, photovoltaic backsheets and other products, which are widely used in electronics, mobile phone screens, PCB, powder spraying, insulation, die-cutting, printing plastics, battery cell aluminum case wrapping, FPC, new energy, photovoltaic and other industries.

To ensure product quality requirements, the company is equipped with precision coating equipment and professional R&D and technical talents.

The company has a high-purification clean workshop and a multi-functional composite precision coating production line, providing customers with R&D, design schemes and market application feedback, and can put into independent mass production services.

Q1: Is PI75 the same as Kapton?
A: PI75 is a general-purpose polyimide film chemically similar to Kapton (DuPont trademark). It meets equivalent thermal, electrical, and mechanical specifications but is offered at a competitive price point. Always test for your specific application.

Q2: How should I store PI75 polyimide film?
A: Store in original packaging at 18–25°C and 40–70% RH, away from direct sunlight. Maximum shelf life is 6 months. Keep the roll wrapped to prevent dust and moisture absorption.