MG Chemicals Polyimide film is a lightweight, flexible 2 mils thick crystalline film with a silicone adhesive designed for 3D printers heated beds. It works well at low temperatures, does not soften when submitted to heat and provides an excellent release surface at elevated temperatures. It offers superior tensile strength, good elongation and is chemical resistant. It also serves as a printer bed surface protector. Available in 4 in. and 8 in. widths and offered in 49 ft splice free rolls.