A Brilliant Idea Behind Every Product.


Alumina Systems GmbH has its roots in the ceramics division of SIEMENS AG. Today, Alumina System is one of the most innovative, medium-sized companies in the industry. After being sold to the management and private investors, Alumina Systems is a completely independent company.

Business Transactions

  • 2002: Separation from SIEMENS AG and sale to DEMAG Holding, Luxembourg (81% KKR, 19% Siemens)
  • 2007: Sale to Johnson Matthey plc, Environmental Control Technology (ECT) division
  • 2008: Sale to LAPP Insulators GmbH (Andlinger Invest)
  • 2011: Sale to Quadriga Capital
  • 2015: Separation of LAPP Insulators Alumina GmbH and foundation of the new holding “Alumina Redwitz Holding GmbH”
  • 2018: Change of name to Alumina Systems GmbH and sale to management and private investors

Company history Redwitz

  • 1950: Foundation of the ceramic insulator plant
  • 1970: Founding of the production of aluminum oxide ceramics
  • 1990: Opening of a sales office in Alpharetta, Georgia (USA)
  • 1995: Founding of the plant for plastic insulators (SIMOTEC)
  • 1998: Takeover of Siemens Fabryka Izolatorow Sp.Z.o.o., Jedlina Zdròj, Poland – and its core business, production of medium and low voltage insulators
  • 2004: Acquisition of IZOCER, Turda, Romania
  • 2012: Acquisition of Technicka Keramika s.a. (CZ) (LAPP Insulators Alumina s.r.o.) – production of thyristors and diodes for industry and HDVC high power applications