| 1955 | Founding of Becromal by Ernest Charles Rosenthal. The first electrochemical etchings are made. |
| 1966 | Construction of the Rozzano (Milano) production site and headquarter. |
| 1969 | Production of the first high voltage foils with the know-how support of Siemens. |
| 1986 | E. Ch. Rosenthal dies. His son, Harry Pierre, becomes President of Becromal. |
| 1992 | Start of production of the new foil types, A991 and later A992, A993 and A994. With these new products, Becromal consolidates its leading position in the field of high voltage foils. |
| 2001-2002 | Important investments in high voltage foil production in Milan, Italy. |
| 2004 | Certification of plant in Milan to ISO 9001. |
| 2006 | Implementation of a pilot plant in Milan based on a new high voltage etching technology. |
| 2008 | In October EPCOS acquires 100% of Becromal shares. |
| 2009 | EPCOS become part of TDK Group. New plant in Iceland starts production. |
| 2010 | Certification of plant in Iceland to ISO 9001. |
| 2011 | New multi-step etching machine starts in Milan the production of very high gain foil. Installation of first Co-Generation Plant in Milan. |
| 2012 | Certification of plant in Milan to OHSAS 18001. |
| 2013 | Second multi-step etching machine starts production in Milan. Extending the production capacity of very high gain foil. |
| 2014 | Release of low OLC forming process, main investments for recycling and recovering of waste in Milan. ISO 14001 certification for Iceland plant. |
| 2015 | ISO TS certification for Milan and Iceland plants. Second Co-Generation plant in Milan. |
| 2017 | ISO 14001 certification for Milan plant. |
| 2018 | IATF certification for Milan and Iceland plants. ISO 50001 certification for Milan plant In October Becromal changes his name in TDK Foil |
| 2019 | ISO 45001 certification for Milan plant |