UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                Date of Report (Date of earliest event reported)
                                  April 7, 2004



                                AEARO CORPORATION
             (Exact name of registrant as specified in its charter)


         Delaware                       0-26942                 13-3840450
      --------------                 -------------           ----------------
(State or Other Jurisdiction    (Commission File Number)     (I.R.S. Employer
     of Incorporation)                                      Identification No.)

                              5457 West 79th Street
                           Indianapolis, Indiana 46268
                         (Address of principal executive
                           offices including Zip Code)


                                 (317) 692-6666
              (Registrant's telephone number, including area code)

                               ______ N/A________
          (Former name or former address, if changed since last report)






Item 1. Changes in Control of Registrant

     As  previously  reported,  on March  10,  2004,  we  entered  into a merger
agreement with AC Safety Holding Corp. and its subsidiary, AC Safety Acquisition
Corp. On April 7, 2004, pursuant to the terms of the Merger Agreement, AC Safety
Acquisition  Corp. merged with and into Aearo Corporation with Aearo Corporation
surviving the merger as a wholly-owned subsidiary of AC Safety Holding Corp.

     Pursuant  to the merger  agreement,  each of the  holders of our  preferred
stock  immediately prior to the merger received cash for their preferred shares.
Each  of the  holders  of  options  to  acquire  a  share  of our  common  stock
immediately  prior to the merger  received cash equal to the amount  between the
per share common merger price and the exercise price of the option. Finally, the
holder of our common stock immediately prior to the merger received cash for his
or its  common  shares  and had the right to elect to  receive a portion  of the
consideration  in shares of AC Safety Holding Corp.  preferred  stock and common
stock ("Capital Stock Units"). Under the merger agreement,  the number of common
shares for which  Capital Stock Units (rather than cash) were issued was limited
to approximately  14% of our shares of common stock outstanding at the effective
time of the merger.

     Approximately  79.5% of the  outstanding  common and preferred  stock of AC
Safety  Holding  Corp.  is now  owned by  affiliates  of Bear  Stearns  Merchant
Banking,  approximately  10.5% of the outstanding  common and preferred stock is
owned by management investors, and approximately 10.0% of the outstanding common
and preferred  stock is owned by certain of our former  stockholders,  including
Vestar Equity Partners, L.P., the former majority holder of our common stock and
preferred stock.


                        Professional Services Agreement

     On the closing date of the merger, AC Safety Acquisition Corp. entered into
a  professional  services  agreement  on our behalf with Bear  Stearns  Merchant
Manager II, LLC, or BSMM, AC Safety Holding Corp.  and Aearo Company.  Under the
terms of the professional  services  agreement,  AC Safety Holding Corp.,  Aearo
Corporation  and  Aearo  Company  agreed  to  retain  BSMM  to  provide  certain
management consulting and financial advisory services, for which BSMM is paid an
annual  management  fee equal to the greater of (i)  $700,000  and (ii) 1.25% of
Consolidated EBITDA (as defined in our senior credit facility),  as adjusted for
certain  expenses.  In addition,  as consideration  for arranging the merger and
certain related  transactions,  we paid BSMM a fee of $6.0 million. If we engage
BSMM with  respect to any merger,  acquisition,  disposition,  recapitalization,
issuance of  securities,  financing or similar  transaction,  we will pay BSMM a
transaction  fee to be  negotiated  between the  parties.  If the parties do not
agree on a fee, the  transaction  fee will be 1.0% of the  aggregate  enterprise
value paid or  provided to Aearo  Corporation.  BSMM will also be entitled to an
exit fee of 0.65% of the aggregate enterprise value paid to Aearo Corporation or
AC Safety  Holding Corp.  in a sale of Aearo  Corporation  or AC Safety  Holding
Corp. The professional services agreement will terminate on the earlier to occur
of (i) the  tenth  anniversary  of the  closing  date of the  merger,  (ii)  the
consummation of a sale of Aearo Corporation, (iii) termination upon thirty days'
written notice by BSMM and (iv) the  consummation of a qualified public offering
of AC Safety Holding Corp.  common stock. Upon the tenth anniversary of the date
of the professional services agreement and the end of each year thereafter,  the
term is  automatically  extended for an  additional  year unless  terminated  by
either  party at least 30 days  prior to such year end.  Under the  professional
services agreement, we, AC Safety Holding Corp. and Aearo Company have agreed to
indemnify  BSMM for any and all claims and losses  arising out of or relating to
the professional services agreement.


Item 7. Financial Statements, Pro Forma Financial Statements and Exhibits

     (c) The following exhibits are filed as part of this Current Report on Form
8-K.

          2.1  Agreement and Plan of Merger dated March 10, 2004 among AC Safety
               Holding Corp., AC Safety Acquisition Corp. and Aearo Corporation.

          10.1 Professional  Services Agreement dated April 7, 2004 by and among
               Bear Stearns  Merchant  Manager II, LLC, AC Safety Holding Corp.,
               AC Safety Acquisition Corp. and Aearo Company. ...







                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                AEARO CORPORATION
                                  (Registrant)


Dated:  April 21, 2004          By:/s/Jeffrey S. Kulka
                                ------------------------------------------------
                                   Jeffrey S. Kulka
                                   Senior Vice President,
                                   Chief Financial Officer and Treasurer






                                  EXHIBIT INDEX

Exhibit No.    Document

   2.1         Agreement and Plan of Merger dated March 10, 2004 among AC Safety
               Holding Corp., AC Safety Acquisition Corp. and Aearo Corporation.

  10.1         Professional  Services Agreement dated April 7, 2004 by and among
               Bear Stearns  Merchant  Manager II, LLC, AC Safety Holding Corp.,
               AC Safety Acquisition Corp. and Aearo Company.