Exhibit 12.1

KRATON PERFORMANCE POLYMERS, INC.

Ratio of Earnings to Fixed Charges

(In thousands)



|                                                                                                             |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|------------------------------------------------------------------------------------------------------------ |  | ---------------- | -------- | - | ---------------- |  | ------- | ---------------- |  |  | ---------------- | - |  | ---------------- | ------- | - |  |  | ------- | -
|                                                                                                             |  | December 31,2010 |          |   | December 31,2009 |  |         | December 31,2008 |  |  | December 31,2007 |   |  | December 31,2006 |        
|Fixed Charges:                                                                                               |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|+ Interest expensed                                                                                          |  |                  | 22,509   |   |                  |  | 29,866  |                  |  |  | 35,212           |   |  |                  | 42,632  |   |  |  | 40,064  |  
|+ Interest capitalized                                                                                       |  |                  | 520      |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|+ Amortization of deferred financing costs                                                                   |  |                  | 2,071    |   |                  |  | 4,090   |                  |  |  | 2,139            |   |  |                  | 2,715   |   |  |  | 2,351   |  
|+ Accretion of debt discount                                                                                 |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  | 25,942  |  
|+ Estimate of interest within rental expense                                                                 |  |                  | 2,205    |   |                  |  | 1,734   |                  |  |  | 2,800            |   |  |                  | 2,449   |   |  |  | 2,449   |  
|+ Preference security dividend requirements                                                                  |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|                                                                                                             |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|Total fixed charges                                                                                          |  |                  | 27,305   |   |                  |  | 35,690  |                  |  |  | 40,151           |   |  |                  | 47,796  |   |  |  | 70,806  |  
|Earnings:                                                                                                    |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|+ Pre-tax income (loss)                                                                                      |  |                  | 111,858  |   |                  |  | (1,657  | )                |  |  | 36,850           |   |  |                  | (37,629 | ) |  |  | (4,022  | )
|- Income from equity investees                                                                               |  |                  | (487     | ) |                  |  | (403    | )                |  |  | (437             | ) |  |                  | (626    | ) |  |  | (168    | )
|+ fixed charges                                                                                              |  |                  | 27,305   |   |                  |  | 35,690  |                  |  |  | 40,151           |   |  |                  | 47,796  |   |  |  | 70,806  |  
|+ Amortization of capitalized interest                                                                       |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|+ Distributed income of equity investees                                                                     |  |                  | 403      |   |                  |  | 433     |                  |  |  | 1,041            |   |  |                  | 106     |   |  |  | 1,265   |  
|+ Pre-tax losses of equity investees for which charges arising from guarantees are included in fixed charges |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|- Interest capitalized                                                                                       |  |                  | (520     | ) |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|- Preference security dividend requirements                                                                  |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|- The minority interest in pre-tax incomeof subsidiaries that have not incurred fixed charges                |  |                  |         |   |                  |  |        |                  |  |  |                 |   |  |                  |        |   |  |  |        |  
|                                                                                                             |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|Total Earnings                                                                                               |  |                  | 138,559  |   |                  |  | 34,063  |                  |  |  | 77,605           |   |  |                  | 9,647   |   |  |  | 67,881  |  
|Deficiency (Surplus)                                                                                         |  |                  | (111,254 | ) |                  |  | 1,627   |                  |  |  | (37,454          | ) |  |                  | 38,149  |   |  |  | 2,925   |  
|                                                                                                             |  |                  |          |   |                  |  |         |                  |  |  |                  |   |  |                  |         |   |  |  |         |  
|Ratio                                                                                                        |  |                  | 5.07     |   |                  |  | 0.95    |                  |  |  | 1.93             |   |  |                  | 0.20    |   |  |  | 0.96    |  
|Ratio of Earnings to Fixed Charges                                                                           |  |                  | 5.1:1.0  |   |                  |  | 1.0:1.0 |                  |  |  | 1.9:1.0          |   |  |                  | 0.2:1.0 |   |  |  | 1.0:1.0 |  

Our earnings were
insufficient to cover our fixed charges for the year ended December 31, 2009 by approximately $1.6 million, for the year ended December 31, 2007 by approximately $38.1 million and for the year ended December 31, 2006 by approximately
$2.9 million.