WIMA's metallized capacitors are made of thin layers of aluminum (approximately 0.03 µm) that are vacuum-deposited on the insulating film as conducting electrodes. In the case of a breakdown, the short-circuit current causes the thin metal coating to evaporate around the point of failure and an insulating area is formed. The capacitor remains intact (self-healing). Due to their construction principle, metallized capacitors stand out for their very favorable capacitance/volume ratio.

By making use of ultra-thin film and appropriate manufacturing experience, it has been possible to achieve high capacitance values in a very small package.

The capacitors are produced with proven technology using solvent-resistant, flame-retardant plastic cases in compliance with UL 94 V-0.