About YAAN

Henan Yaan Insulation Material Plant Co., Ltd

Add: No1.West Shunxiang Road, Weidu district, Xuchang City, Henan Province,China 461000.

Tel: +86-199 3740 8623

Yaan insulation

Insulation experts around the enterprise

Brief Introduction of Polyester films and Polyimide material

Polyester films: For simple electrical insulating applications where a thin film is required, polyester films are probably the most common type of electrical insulator material used. Polyester films are commonly characterized as either PET (polyethylene terephthalate) or PEN (polyethylene naphthalate), the differences lying in their chemical composition and their resulting physical and electrical insulating properties. PET films, such as Mylar® or Melinex®, offer good dielectric withstanding resistance within a relative temperature range (Tg of 78°C), where as PEN films, such as Teonex®, typically provide similar electrical performance at a much higher temperature range (Tg of 120°C). In applications involving higher temperatures, PEN films are often a better choice than PET films given its 3-4 times greater stiffness at temperatures above 125 °C , as well as its 20°C greater operating temperature than PET (180°C vs. 160°C). Of course, PEN films are more expensive than PET films; however for mission critical applications this cost difference may be negligible. These thin films are found in thousands of applications including flexible electronics, battery and motor insulations, and electronic component manufacturing.
insulation film

Polyimide materials: Where even greater temperature resistance is required while maintaining excellent electrical insulating performance, polyimide materials are often called upon. Polyimide films such as DuPontTM Kapton® have been used for years as an outstanding electrical insulating material, and thicker polyimide materials such as Vespel®, Torlon®, and DuPontTM Cirlex® continue to be utilized as alternatives to PEI materials where mission critical applications require precision engineered materials. Cirlex®, made from 100% Kapton® polyimide film, has a glass transition temperature of 351°C, far exceeding that of PEI materials, providing exceptional stability at demanding temperatures. Its very low Coefficient of Thermal Expansion (20 ppm/°C) along with its high tensile strength (32000 psi @ 200°C at 9 mil) makes Cirlex® an exceptionally strong and stable material across its operating temperature range of -269°C to 351°C. Another unique characteristic of Cirlex® is its availability in increments of 0.001” from 0.004” up to 0.125” or thicker. This allows a tremendous amount of design flexibility for the mechanical engineer, as the engineer can enter the design phase without thinking of material thickness limitations, but rather design specifically for their application knowing the right thickness material is available to them. The availability of Cirlex® in 0.001” increments also greatly reduces the amount of machining time required to get to final thickness tolerances, which must be considered when designing for manufacturability. Cirlex’s® physical and mechanical stability are also evident during and after the machining process, as there are no residual stresses built up in the material leaving the final design in its dead-flat form. In applications where extreme temperature or environmental requirements are needed, the benefits of a polyimide material such as Cirlex® outweigh other material choices.