Exhibit12

CELANESE HOLDINGS LLCCOMPUTATION OF RATIO OF EARNINGS TOFIXEDCHARGES

|                                                                           |  |                                      |         |                                      |  |                                     |         |                                   |  |                                 |        |         |  |        |         |         |  |        |         |         |  |  |
|---------------------------------------------------------------------------|--|--------------------------------------|---------|--------------------------------------|--|-------------------------------------|---------|-----------------------------------|--|---------------------------------|--------|---------|--|--------|---------|---------|--|--------|---------|---------|--|--|
|                                                                      |  | Successor                            |         | Predecessor                          |
|                                                                      |  | ThreeMonths Ended September 30, 2005 |         | ThreeMonths Ended September 30, 2004 |  | Nine MonthsEnded September 30, 2005 |         | Six Months EndedSeptember 30,2004 |  | Three Months Ended March31,2004 |
| Earnings:                                                                 |  |                                 |    |                                 |  |                                |    |                              |  |                            |   |    |  |   |    |    |  |   |    |    |
| Earnings(loss) from continuing operations before tax and minorityinterest |  |                                 | 86      |                                 |  |                                | 11      |                              |  |                            | 276    |    |  |   | (84     | )  |  |   | 72      |    |
| Less:                                                                     |  |                                 |    |                                 |  |                                |    |                              |  |                            |   |    |  |   |    |    |  |   |    |    |
| Equityin net earnings ofaffiliates                                        |  |                                 | (21     | )                               |  |                                | (17     | )                            |  |                            | (48    | )  |  |   | (35     | )  |  |   | (12     | )  |
| Plus:                                                                     |  |                                 |    |                                 |  |                                |    |                              |  |                            |   |    |  |   |    |    |  |   |    |    |
| Incomedistributions from equityinvestments                                |  |                                 | 14      |                                 |  |                                | 15      |                              |  |                            | 60     |    |  |   | 21      |    |  |   | 15      |    |
| Amortizationof capitalizedinterest                                        |  |                                 | — |                                 |  |                                | 2       |                              |  |                            | 3      |    |  |   | 4       |    |  |   | 2       |    |
| Totalfixedcharges                                                         |  |                                 | 72      |                                 |  |                                | 65      |                              |  |                            | 301    |    |  |   | 196     |    |  |   | 16      |    |
| Totalearnings as defined before combined fixedcharges                     |  |                                 | 151     |                                 |  |                                | 76      |                              |  |                            | 592    |    |  |   | 102     |    |  |   | 93      |    |
| Fixedcharges:                                                             |  |                                 |    |                                 |  |                                |    |                              |  |                            |   |    |  |   |    |    |  |   |    |    |
| Interestexpense                                                           |  |                                 | 62      |                                 |  |                                | 57      |                              |  |                            | 261    |    |  |   | 181     |    |  |   | 6       |    |
| Capitalizedinterest                                                       |  |                                 | — |                                 |  |                                | 1       |                              |  |                            | 3      |    |  |   | 2       |    |  |   | 3       |    |
| Estimatedinterest portion of rentexpense                                  |  |                                 | 5       |                                 |  |                                | 7       |                              |  |                            | 17     |    |  |   | 13      |    |  |   | 7       |    |
| Guaranteedpayment to minorityshareholders                                 |  |                                 | 5       |                                 |  |                                | — |                              |  |                            | 20     |    |  |   | — |    |  |   | — |    |
| Totalcombined fixedcharges                                                |  |                                 | 72      |                                 |  |                                | 65      |                              |  |                            | 301    |    |  |   | 196     |    |  |   | 16      |    |
| Ratioof earnings to combined fixedcharges(1)                              |  |                                 | 2.1     |                                 |  |                                | 1.2     |                              |  |                            | 2.0    |    |  |   | 0.5     |    |  |   | 5.8     |    |
|                                                                           |

|     |                                                                                                                     |
|-----|---------------------------------------------------------------------------------------------------------------------|
| (1) | Earningswere insufficient to cover combined fixed charges by $94 million forthe six months ended September 30,2004. |

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