The winding of the elements are manufactured in the latest state of art winding machines and specially designed wavy cut film is mainly used. So that zinc layer remains intact with the elements.
These capacitor elements are placed in aluminium can and the capacitor undergoes in vacuum process and environment friendly inert gas is impregnated.
This capacitors have advantage of better cooling and heat dissipation. the impregnated gas used acts as a insulation as wells as it protects the zinc layer from oxidation.