The link between PP-fi lm and zinc contact layer is highly stressed during high surge or rms currents and therefore considered very critical for operating life and reliability of the capacitor. By cutting the fi lm for selected types in a wavelike manner, we increase the contact surface between fi lm and zinc layer which substantially reduces this strain. With SINECUT, ELECTRONICON has created its own optimized solution and improved the current strength by several percent compared with existing wave-cut technologies.