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

How to Specify Electrical Insulating Material

Choosing the right material and processes for a high-performance electromechanical components is a delicate balance between form, fit, function, and cost. It is important for the engineer to consider all aspects of the part’s functional design as it relates to the physical, electrical, and thermal properties of the environment in which it will perform. The selection of the optimal electrical insulating material, whether it is a PET, PEN, PEI, or polyimide, is a function of the anticipated operational and environmental requirements.
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 found 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), whereas 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 they are three to four times stiffer at temperatures above +125°C , as well as their higher operating temperature as compared to PET (+180°C vs. +160°C). PEN films are more expensive than PET films, but for mission critical applications this cost difference may be worthwhile. These thin films are found in thousands of applications including flexible electronics, battery and motor insulations, and electronic component manufacturing.
insulation film

Polyimide Materials
When even greater temperature resistance is required while still maintaining electrical insulating performance, polyimide materials are often used. Polyimide films such as KAPTON® have been used for years as electrical insulating material, and thicker polyimide materials such as CIRLEX®, Vespel, and Torlon continue to be utilized as alternatives to PEI materials where critical applications require highly engineered materials. CIRLEX, made from 100% KAPTON polyimide film, has a glass transition temperature of +351°C, far exceeding that of PEI materials, so it provides exceptional stability at demanding temperatures. Its very low coefficient of thermal expansion (20ppm/°C) along with its high tensile strength (32,000 psi at +200°C at 9mil) makes CIRLEX an exceptionally strong and stable material across its operating temperature range of -269°C to +351°C. (A chart comparing these materials is shown below.)