Exhibit
  31.2

CERTIFICATION
  PURSUANT TORULE
  15d-14(a) OFTHE
  SECURITIES EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TOSECTION
  302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jeffrey S. Kulka, certify that:

|1 | I
      have reviewed this annual report on Form 10-K of Aearo Company I;                                                                                                                                                                                                                                                                             
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|2 | Based
      on my knowledge, this annual report does not contain any untrue statement
      of a material fact or omit to state a material fact necessary to make the
      statements made, in light of the circumstances under which such statements
      were made, not misleading with respect to the period covered by this annual
      report;
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|3 | Based
      on my knowledge, the financial statements, and other financial information
      included in this annual report, fairly present in all material respects
      the financial condition, results of operations, and cash flows of the registrant
      as of, and for, the periods presented in this annual report;                        
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|4 | The
      registrants other certifying officers and I are responsible for establishing
      and maintaining disclosure controls and procedures (as defined in Exchange
      Act Rules 13a-15(e) and 15d-15(e)) for the registrant and we have:                                                                                                     
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|5 | The
         registrants other certifying officers and I have disclosed, based
          on our most recent evaluation of internal control over financial reporting,

      to the registrants auditors and the audit committee of the registrants
       board of directors (or persons performing the equivalent function):                      
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|                             | /s/
      Jeffrey S. Kulka                          
|---------------------------- | ----------------------------------------------------
|                             |                                                     
|                             | Jeffrey
      S. Kulka                              
|                             | Senior Vice
      President, Chief Financial Officer
|                             | Treasurer
      and Secretary                       
|Date:December
      17, 2004 |                                                     

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