Since the introduction of the first bidirectional polypropylene film (BOPP) production line from Germany in 1989, Tongfeng people in the field of capacitor film diligently, continuous exploration and practice, to drive industry innovation as their own responsibility, in order to meet customer needs of new products and new technology emerged in endlessly. Tongfeng now has six polypropylene film production lines, with an annual output of 15,000 tons of polypropylene film. The product varieties are coarse film, corona treated coarse film, corona treated flat film and non corona treated flat film. The product's temperature rating is 70 °C, 85 °C, 100 °C and 115 °C. Product thickness ranges from 2.2 microns to 18 microns.