Exhibit 21 THERMO FIBERTEK INC. Subsidiaries of the Registrant At February 28,1997, the Registrant owned the following companies: State or Registrant's Jurisdiction % of Name of Incorporation Ownership ----------------------------------- ---------------- ------------ AES Equipos y Sistemas S.A. de C.V. Mexico 100 Enviroprint Inc. Delaware 100 Fibertek Construction Company, Inc. Maine 100 Thermo AES Canada Inc. Canada 100 Thermo Web Systems, Inc. Massachusetts 100 Fiberprep, Inc. Delaware 95 (31.05% of which shares are owned directly by E. & M. Lamort, S.A.) Fiberprep Securities Corporation Delaware 100 Thermo Wisconsin, Inc. Wisconsin 100 Thermo Fibergen Inc. Delaware 68 GranTek Inc. Wisconsin 100 Thermo Fibertek U.K. Limited United Kingdom 100 Vickerys Holdings Limited United Kingdom 100 Vickerys Limited United Kingdom 100 Paperliners Limited New Zealand 100 Vickerys Projects Limited United Kingdom 100 Winterburn Limited United Kingdom 100 TMO Lamort Holdings Inc. Delaware 100 E. & M. Lamort, S.A. France 100 Lamort Equipamentos Industrieis LTDA Brazil 60 Lamort GmbH Germany 100 Lamort Iberia S.A. Spain 100 Lamort Italia S.R.L. Italy 100 Lamort Paper Services Ltd. United Kingdom 100 Nordiska Lamort Lodding A.B. Sweden 100