Polyimide film (similar to Kapton® HN) possesses excellent physical, chemical, and electrical properties, atomic radiation resistant, corrosion and solvent resistant, low & high temperature resistant, It performs successfully in the wide range of temperature as low as -452F(-269c) and as high as +500F(+260c). Kapton film for voice coil has special property of low shrinkage and one side rough for coating. It is more popular used in making voice voil associated with Til film (polyimide varnished glass cloth).