Exhibit 21.1

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SUBSIDIARIES OF THE REGISTRANT

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| Name of Subsidiary                             |      | State or Jurisdiction of  Incorporation or Organization |     | Names Under Which Subsidiary  Does Business                  |
|------------------------------------------------|--------------------------|---------------------------------------------------------|--------------------|--------------------------------------------------------------|
| WinCup Holdings, Inc.(1)                       |                     | Delaware                                                |               | WinCup Holdings, Inc. WinCup Holdings of Texas, Inc.  WinCup |
| Radnor Chemical Corporation (1)                |                     | Delaware                                                |               | Radnor Chemical Corporation                                  |
| StyroChem Canada, Ltd. (2)                     |                     | Quebec                                                  |               | StyroChem Canada, Ltd.  StyroChem International              |
| StyroChem U.S., Ltd. (3)                       |                     | Texas                                                   |               | StyroChem U.S., Ltd.  StyroChem International                |
| WinCup Texas, Ltd. (4)                         |                     | Texas                                                   |               | WinCup Texas, Ltd.  WinCup                                   |
| StyroChem GP, L.L.C.(2)                        |                     | Delaware                                                |               | StyroChem GP, L.L.C.                                         |
| StyroChem LP, L.L.C.(2)                        |                     | Delaware                                                |               | StyroChem LP, L.L.C.                                         |
| WinCup GP, L.L.C. (5)                          |                     | Delaware                                                |               | WinCup GP, L.L.C.                                            |
| WinCup LP, L.L.C. (5)                          |                     | Delaware                                                |               | WinCup LP, L.L.C.                                            |
| Radnor Management, Inc.(1)                     |                     | Delaware                                                |               | Radnor Management, Inc.                                      |
| Radnor Investments II, Inc. (9)                |                     | Delaware                                                |               | Radnor Investments II, Inc.                                  |
| StyroChem Europe Delaware, Inc. (2)            |                     | Delaware                                                |               | StyroChem Europe Delaware, Inc.                              |
| StyroChem Holdings (The  Netherlands) B.V. (6) |                     | The Netherlands                                         |               | StyroChem Holdings (The  Netherlands) BV                     |
| StyroChem Europe (The Netherlands) BV(7)       |                     | The Netherlands                                         |               | StyroChem Europe (The  Netherlands) BV                       |
| StyroChem Finland Oy(8)                        |                     | Finland                                                 |               | StyroChem Finland Oy StyroChem International                 |

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| (1) |    | Owned 100% by Radnor Holdings Corporation.                       |
|-----|--------------|------------------------------------------------------------------|
| (2) |         | Owned 100% by Radnor Chemical Corporation.                       |
| (3) |         | Owned 99% by StyroChem LP, L.L.C. and 1% by StyroChem GP, L.L.C. |
| (4) |         | Owned 99% by WinCup LP, L.L.C. and 1% by WinCup GP, L.L.C.       |
| (5) |         | Owned 100% by WinCup Holdings, Inc.                              |
| (6) |         | Owned 100% by StyroChem Europe Delaware, Inc.                    |
| (7) |         | Owned 100% by StyroChem Holdings (The Netherlands) BV            |
| (8) |         | Owned 100% by StyroChem Europe (The Netherlands) BV              |
| (9) |         | Owned 100% indirectly by Radnor Holdings Corporation.            |