The next important process is Vacuum drying and impregnation of capacitors. The Container assembled winding packs are loaded in impregnation chamber. When they are dried under elevated temp.and vacuum, then impregnating fluid is filtered taken through vacuum dehydrating and degassing processes before it passes, still under vacuum to the impregnation chamber. After impregnation the capacitors are left for soaking for a specific period. Then capacitors are unloaded. This impregnation process is the heart of capacitor manufacturing.