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): March 14, 2003



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




         Illinois                   000-11472                    36-3683785
(State or other jurisdiction       (Commission                  (IRS Employer
        of incorporation)          File Number)              Identification No.)


              6502 South Archer Road, Bedford Park, Illinois 60501
       Registrant's telephone number, including area code: (708) 563-9200

               (Address of principal executive offices) (Zip Code)



         (Former name or former address, if changed since last report.)





ITEM 5.  OTHER EVENTS

         On March 14, 2003, the Company issued the press release which is
attached hereto as Exhibit 99.1.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

(c)      Exhibits:

         Exhibit No.       Description

            99.1           Press release dated March 14, 2003.

FORWARD LOOKING STATEMENTS

         Except for historical information, this Form 8-K contains certain
forward-looking statements that involve risk and uncertainties, which may cause
actual results to differ materially from the statements made including market
potential, regulatory clearances, business growth, and other risks listed from
time to time in the Company's Securities and Exchange Commission (SEC) filings.
These forward-looking statements represent the Company's judgment, as of the
date of this release, and the Company disclaims any intent or obligation to
update these forward-looking statements.

                                    SIGNATURE

         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.

                                    DONLAR CORPORATION



Dated:  March 14, 2003              By: /s/ Larry P. Koskan
                                        ----------------------------------------
                                        Larry P. Koskan, Chief Executive Officer





                                INDEX TO EXHIBITS

         Exhibit No.       Description

              99.1         Press Release.