. . . EXHIBIT 21 POLYONE CORPORATION SUBSIDIARIES Jurisdiction of Name Incorporation - ---- ------------- 1997 Chlor-Alkali Venture Inc. Alabama Altona Properties Pty Ltd. (1) Australia Auseon Limited Australia Welvic Australia Pty Ltd. (1) Australia PolyOne Wilflex Australasis, PTY Ltd. Australia PolyOne Canada, Inc. Canada LP Holdings, Inc. Canada Geon Polimeros Andinos S.A. (2) Columbia (6) Resintech, S.A. Costa Rica 1999 General Compounding Partnership Inc. Delaware (6) 1999 Limited Compounding Partnership Inc. Delaware 1999 PVC Partner Inc. Delaware (6) Lincoln & Southern Railroad Company Delaware Oxy Vinyls, LP (3) Delaware (6) PVC Powder Blends, LP (4) Delaware (6) Sunbelt Chlor-Alkali Partnership (2) Delaware (6) Acrol Holdings Limited England PolyOne Engineering Vinyls UK, Ltd. England PolyOne Wilflex Europe, Ltd. England Regalite Plastics Corporation Massachusetts O'Sullivan Plastics Corporation Nevada Geon Development Inc. Ohio Polymer Diagnostics, Inc. Ohio SPC Geon PTE LTD. (2) Singapore Shawnee Holdings, Inc. Virginia PolyOne Engineered Films, Inc. Virginia Burton Rubber Company Ohio Burton Rubber Compounding, LP Delaware (6) PolyOne Elastomers Canada, Inc. Ontario M.A. Hanna Plastic Group, Inc. Michigan Compounding Technology, Euro S.A. France PolyOne Singapore, Ltd. Singapore DH Compounding Company (2) Delaware (6) Hanna France SARL France Hanna PAR Corporation Delaware Hollinger Development Company Nevada PolyOne Compuestos, S.A. de C.V. Mexico PolyOne - Suzhou, China China PolyOne Hungary, Ltd. Hungary PolyOne Shanghai, China China M.A. Hanna Asia Holding Company Delaware M.A. Hanna Export Services Company Barbados M.A. Hanna International Financial Services Company Ireland M.A. Hanna de Mexico, S.A. de C.V. Mexico MAH Plastics Company Delaware Jurisdiction of Name Incorporation - ---- ------------- PolyOne Funding Corporation Delaware PolyOne E.C. De Mexico, S.A. de C.V. Mexico MAHRC Servicios S.A. De C.V. Mexico PolyOne Werk Melos, GmbH Germany PolyOne Spain, S.A. Spain TRANSCOLOR, S.A. Spain Star Color Co., Ltd. Thailand Tekno Polimer Group (5) Turkey PolyOne Th. Bergmann, GmbH Germany UBE-Hanna Compounding GmbH (2) Germany PolyOne Compounds & Colors U.K., Ltd. England PolyOne Norway A.S. Norway PolyOne France, S.A. France PolyOne Sweden, A.B. Sweden RA Products, Inc. Michigan Conexus, Inc. Nevada PolyOne Distribution Canada, Inc. Canada PolyOne Colors and Additives Germany, GmbH Germany Hanna Deutschland, GmbH Germany PolyOne Werk Krause, GmbH Germany L.E. Carpenter & Company Delaware PolyOne Distribution De Mexico S.A., de C.V. Mexico M.A. Hanna UK, Ltd. England Notes: (1) Owned 37.4% by the Company (2) Owned 50% by the Company (3) Owned 24% by the Company (4) Owned 90% by the Company (5) Owned 87% by the Company (6) Partnership The Company has other subsidiaries not listed above which, if considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary as of December 31, 2002.