EXHIBIT 21 SPARTECH CORPORATION SUBSIDIARIES OF REGISTRANT Legal Entity DBA Incorporation or Organization Atlas Alchem Plastics, Spartech Plastics Delaware Inc. TKM Plastics, LP Spartech Plastics Missouri Franklin-Burlington Spartech Vy-Cal Delaware Plastics, Inc. Spartech Polycom Alchem Plastics, Inc. Spartech Plastics Delaware Alchem Plastics Spartech Plastics Georgia Corporation Anjac-Doron Plastics, Inc. Spartech Profiles California Spartech Polycom, Inc. Spartech Polycom Pennsylvania Spartech Color Spartech Polycom, S.A.S. Spartech Polycom France PolyTech South, Inc. Spartech Polycom Delaware UVTEC, L.P. Spartech Polycom Texas Spartech Plastics, Inc. Spartech Plastics Delaware Spartech Industries, Inc. Spartech Industries Delaware Spartech Profiles Spartech Canada, Inc. Spartech Color New Brunswick Spartech Plastics Spartech Profiles Alshin Tire Corporation Spartech Industries California Spartech Polycast, Inc. Spartech Polycast Delaware Spartech Townsend, Inc. Spartech Townsend Delaware Spartech Industries Spartech Marine Delaware Florida, Inc. Spartech de Mexico, S.A. Spartech Plastics Mexico de C.V. Spartech Polycom Polymer Extruded Products, Spartech PEP New Jersey Inc. Spartech SPD, LLC Spartech Plastics Delaware Spartech CMD, LLC Spartech Polycom Delaware Spartech FCD, LLC Spartech Polycom Delaware X-Core, LLC Spartech Industries California