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Exhibit 12.01

ATMI, INC.
RATIO OF EARNINGS TO FIXED CHARGES
(In thousands, except ratios)

|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        |  | 
|--------------------------------------------------------------------- |  | --- | ------- | --- | ---- | ------- | ------------------------------ | ---- | ---- | --- | ------ | - |  | - | ------ | - |  | - | ------ |  | 
|                                                                      |  |     |         |     |      |         | Fiscal Year Ended December 31, |      |      |     |       
|                                                                      |  |     | 2002    |     | 2001 |         | 2000                           |      | 1999 |     | 1998  
|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        |  | 
|EARNINGS                                                              |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Income (loss) before provision (benefit) for
Income taxes             |  | $   | (48,763 | )   |      | $       | (15,541                        | )    |      | $   | 70,522 |   |  | $ | 18,807 |   |  | $ | 8,800  | 
|Capitalized interest                                                  |  |     | (904    | )   |      |         | (995                           | )    |      |     | (23    | ) |  |   | (50    | ) |  |   |       | 
|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Total earnings (loss), net of fixed charges                           |  |     | (49,667 | )   |      |         | (16,536                        | )    |      |     | 70,499 |   |  |   | 18,757 |   |  |   | 8,800  | 
|FIXED CHARGES                                                         |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Interest on long-term and short-term debt                             |  |     | 6,670   |     |      |         | 1,195                          |      |      |     | 1,247  |   |  |   | 1,267  |   |  |   | 1,723  | 
|Amortization of debt service costs                                    |  |     | 841     |     |      |         | 171                            |      |      |     |       |   |  |   |       |   |  |   |       | 
|Capitalized interest                                                  |  |     | 904     |     |      |         | 995                            |      |      |     | 23     |   |  |   | 50     |   |  |   |       | 
|Rental expenses representative of an interest factor                  |  |     | 305     |     |      |         | 299                            |      |      |     | 343    |   |  |   | 350    |   |  |   | 364    | 
|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Total fixed charges                                                   |  |     | 8,720   |     |      |         | 2,660                          |      |      |     | 1,613  |   |  |   | 1,667  |   |  |   | 2,087  | 
|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Total adjusted earnings (loss) available for
payment of fixed charges |  | $   | (40,947 | )   |      | $       | (13,876                        | )    |      | $   | 72,112 |   |  | $ | 20,424 |   |  | $ | 10,887 | 
|                                                                      |  |     |         |     |      |         |                                |      |      |     |        |   |  |   |        |   |  |   |        | 
|Ratio of earnings to fixed charges                                    |  | (1) |         | (2) |      | 44.7(3) |                                | 12.3 |      | 5.2



|(1) |  | As a result of the loss incurred in 2002, the Company was unable to
fully cover the indicated total fixed charges by $48,763.                                                                                                                                                                                  
|--- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|   
|(2) |  | As a result of the loss incurred in 2001, the Company was unable to
fully cover the indicated total fixed charges by $15,541.                                                                                                                                                                                  
|   
|(3) |  | Included in earnings for 2000 was a nonrecurring gain of $9,520
related to the sale of available-for-sale securities, partially offset
by a $1,250 write-down of other available-for-sale securities. If such
nonrecurring items had not occurred, the ratio of earnings to fixed
charges would have been 39.6.