The main performance index of a series of ultra clean polypropylene film for capacitor prepared by different polypropylene granules and film manufacturers are studied. The difference of each performan in crystallization characteristics

thermal performance

dielectric performance and insulation performance of capacitor film prepared by different polypropylene granules is compared. The test results show that the performance of some domestic-made polypropylene film for capacitor has reached the standards of imported film

but the former still has such problem as low crystallinity and weak quality of thin films. There are still gap between the domestic-made polypropylene film for capacitor and the world level. The domestic polypropylene granules and optimization of film preparation processes still need imporvement and the preparation of the film process still needs optimization.