Polyimide (sometimes abbreviated PI) is a polymer of imide monomers. Polyimides have been in mass production since 1955. With their high heat-resistance, polyimides enjoy diverse applications in roles demanding rugged organic material. Polyimides are known for thermal stability, good chemical resistance, and excellent mechanical properties.polyimide film is a tough, aromatic polyimide film, exhibiting an excellent balance of physical, chemical, and electrical properties over a wide temperature range, particularly at unusually high temperature. The flexible printed circuit is expected to be the largest and fastest-growing application in the global polyimide films market during the forecast period, 2017 – 2022. The polyimide films that are used for the flexible printed circuit help in providing additional thickness which is required by end-use industries such as electronics and automotive. The flexible printed circuit application is projected to grow at a higher rate in comparison to the other segments mainly due to the growing demand from mobile devices, computers, automotive, and military electronics industries.