What capacitors are encapsulated with epoxy

What are the advantages of epoxy dipped capacitors?

Finally the capacitor cells can be protected for severe environmental conditions or to withstand passive flammability. Encapsulation with epoxy materials in plastic boxes is common used for fixed outline dimensions. Epoxy dipped capacitors have a more rounded and easy to handle shape.

Are epoxy dipped capacitors flame retardant?

Epoxy dipped capacitors have a more rounded and easy to handle shape. All these encapsulations are flame retardant materials fulfilling the UL 94 classification system. Axial types are typically of the wrapped end construction. An extra wrapped film and epoxy at the end connections protects the cell.

How do you encapsulate a capacitor?

The stack is vacuum impregnated, usually with epoxy. Because the silver electrodes are extremely apt to migration in moisture the capacitor has to be encapsulated. Either it is molded in plastic or dipped in some kind of phenolic lacquer. The more layers the better vapor barrier.

What is the thickness of a metalized capacitor?

The thin metalized electrodes have a thickness of approximately 10 nm to 50 nm. The electrodes of film / foil capacitors have discrete metal foils with thicknesses of approximately 5 μm to 10 μm. Metalized capacitors have a self-healing behavior as an intrinsic characteristic. Self healing is the ability to recover after a dielectric breakdown.

Are polypropylene film capacitors better than electrolytic capacitors?

The polypropylene film capacitors offer considerable advantages as the DC link capacitor over the electrolytic capacitor. While it does not have the energy density of an electrolytic capacitor, the DC link film capacitor will have a higher current-handling ability and lifetime.

Why are film / foil capacitors used instead of metalized capacitors?

Due to their construction, very thick electrodes, film / foil capacitors can carry higher currents than metalized types, but are much larger in volume. These capacitors can not recover after a breakdown. Therefore In some constructions double side metalized plastic film is used as electrode to replace the foil.