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

                                  SCHEDULE 13G
                                 (Rule 13d-102)

     Information to be Included in Statements Filed Pursuant to Rule 13d-1(b),
     (c), and (d) and Amendments Thereto Filed Pursuant to Rule 13d-2.

                    Under the Securities Exchange Act of 1934
                              (Amendment No. ___)*


                              Engelhard Corporation
                              ---------------------
                                (Name of Issuer)

                     Common Stock, par value $1.00 per share
                     ---------------------------------------
                         (Title of Class of Securities)

                                    292845104
                                    ---------
                                 (CUSIP Number)

                                   May 8, 2006
                                   -----------
             (Date of Event which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

        [ ]   Rule 13d-1(b)
        [x]   Rule 13d-1(c)
        [ ]   Rule 13d-1(d)



*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act,
but shall be subject to all other provisions of the Act (however, see the
Notes).



                                                                                                    

CUSIP NO. 552691206                                             13G                                               Page 2 of 8 Pages

------------ -----------------------------------------------------------------------------------------------------------------------
     1       NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

                    Heyman Investment Associates Limited Partnership
------------ -----------------------------------------------------------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP        (a) [ ]
                                                                     (b) [X]
------------ -----------------------------------------------------------------------------------------------------------------------
     3       SEC USE ONLY

------------ -----------------------------------------------------------------------------------------------------------------------
     4       CITIZENSHIP OR PLACE OF ORGANIZATION

                    Connecticut
-------------------------- ---------- ----------------------------------------------------------------------------------------------
                               5      SOLE VOTING POWER
        NUMBER OF
         SHARES                                0
      BENEFICIALLY
        OWNED BY
          EACH
        REPORTING
         PERSON
          WITH
                           ---------- ----------------------------------------------------------------------------------------------
                               6      SHARED VOTING POWER

                                               4,850,951
                           ---------- ----------------------------------------------------------------------------------------------
                               7      SOLE DISPOSITIVE POWER

                                               0
                           ---------- ----------------------------------------------------------------------------------------------
                               8      SHARED DISPOSITIVE POWER

                                               4,850,951
------------ -----------------------------------------------------------------------------------------------------------------------
     9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                             4,850,951
------------ -----------------------------------------------------------------------------------------------------------------------
    10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

                             [  ]
------------ -----------------------------------------------------------------------------------------------------------------------
    11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                            3.9%
------------ -----------------------------------------------------------------------------------------------------------------------
    12       TYPE OF REPORTING PERSON

                             PN
------------ -----------------------------------------------------------------------------------------------------------------------


CUSIP NO. 552691206                                             13G                                               Page 3 of 8 Pages

------------ -----------------------------------------------------------------------------------------------------------------------
     1       NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

                    Heyvestco LLC
------------ -----------------------------------------------------------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP        (a) [ ]
                                                                     (b) [X]
------------ -----------------------------------------------------------------------------------------------------------------------
     3       SEC USE ONLY

------------ -----------------------------------------------------------------------------------------------------------------------
     4       CITIZENSHIP OR PLACE OF ORGANIZATION

                    Connecticut
-------------------------- ---------- ----------------------------------------------------------------------------------------------
                               5      SOLE VOTING POWER
        NUMBER OF
         SHARES                                0
      BENEFICIALLY
        OWNED BY
          EACH
        REPORTING
         PERSON
          WITH
                           ---------- ----------------------------------------------------------------------------------------------
                               6      SHARED VOTING POWER

                                               2,039,400
                           ---------- ----------------------------------------------------------------------------------------------
                               7      SOLE DISPOSITIVE POWER

                                               0
                           ---------- ----------------------------------------------------------------------------------------------
                               8      SHARED DISPOSITIVE POWER

                                               2,039,400
------------ -----------------------------------------------------------------------------------------------------------------------
     9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                             2,039,400
------------ -----------------------------------------------------------------------------------------------------------------------
    10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

                             [  ]
------------ -----------------------------------------------------------------------------------------------------------------------
    11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                             1.6%
------------ -----------------------------------------------------------------------------------------------------------------------
    12       TYPE OF REPORTING PERSON

                             OO
------------ -----------------------------------------------------------------------------------------------------------------------


CUSIP NO. 552691206                                             13G                                               Page 4 of 8 Pages

------------ -----------------------------------------------------------------------------------------------------------------------
     1       NAME OF REPORTING PERSON
             I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

                    Samuel J. Heyman
------------ -----------------------------------------------------------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP         (a) [ ]
                                                                      (b) [X]
------------ -----------------------------------------------------------------------------------------------------------------------
     3       SEC USE ONLY

------------ -----------------------------------------------------------------------------------------------------------------------
     4       CITIZENSHIP OR PLACE OF ORGANIZATION

                    U.S.A.
-------------------------- ---------- ----------------------------------------------------------------------------------------------
                               5      SOLE VOTING POWER
        NUMBER OF
         SHARES                                0
      BENEFICIALLY
        OWNED BY
          EACH
        REPORTING
         PERSON
          WITH
                           ---------- ----------------------------------------------------------------------------------------------
                               6      SHARED VOTING POWER

                                               6,890,351
                           ---------- ----------------------------------------------------------------------------------------------
                               7      SOLE DISPOSITIVE POWER

                                               0
                           ---------- ----------------------------------------------------------------------------------------------
                               8      SHARED DISPOSITIVE POWER

                                               6,890,351
------------ -----------------------------------------------------------------------------------------------------------------------
     9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                             6,890,351
------------ -----------------------------------------------------------------------------------------------------------------------
    10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

                             [  ]
------------ -----------------------------------------------------------------------------------------------------------------------
    11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                             5.6%
------------ -----------------------------------------------------------------------------------------------------------------------
    12       TYPE OF REPORTING PERSON

                             IN
------------ -----------------------------------------------------------------------------------------------------------------------




ITEM 1(a).     NAME OF ISSUER:

               Engelhard Corporation

ITEM 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               101 Wood Avenue
               Iselin, New Jersey 08830

ITEM 2(a).     NAME OF PERSON FILING:

               (i)      Heyman Investment Associates Limited Partnership
               (ii)     Heyvestco LLC
               (iii)    Samuel J. Heyman

ITEM 2(b)      ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

               The principal business office of Heyman Investment Associates
               Limited Partnership and Heyvestco LLC  is:

               333 Post Road West
               Westport, Connecticut 06880

               The principal business office of Samuel J. Heyman is:

               667 Madison Avenue - 12th Floor
               New York, New York 10021


ITEM 2(c)      CITIZENSHIP:

               Each of Heyman Investment Associates Limited Partnership and
               Heyvestco LLC is organized under the laws of the state of:

               Connecticut

               The citizenship of Samuel J. Heyman is:

               U.S.A.

ITEM 2(d)      TITLE OF CLASS OF SECURITIES:

               The title of the class of securities held by each of the
               filing persons is:

               Common Stock, par value $1.00 per share

ITEM 2(e)      CUSIP Number:

               The CUSIP number for the shares held by each of the filing
               persons is:

               292845104

ITEM 3.        If this statement is filed pursuant to Rule 13d-1(b), or Rule
               13d-2(b) or (c), check whether the person filing is a:

               (a) [ ] Broker or dealer registered under Section 15 of the
                       Exchange Act.

               (b) [ ] Bank as defined in Section 3(a)(6) of the Exchange Act.

               (c) [ ] Insurance company as defined in Section 3(a)(19) of the
                       Exchange Act.


                                   Page 5 of 8

               (d) [ ] Investment company registered under Section 8 of the
                       Investment Company Act.

               (e) [ ] An investment adviser in accordance with Rule 13d-1(b)(1)
                      (ii)(E);

               (f) [ ] An employee benefit plan or endowment fund in accordance
                       with Rule 13d-1(b)(1)(ii)(F);

               (g) [ ] A parent holding company or control person in accordance
                       with Rule 13d-1(b)(1)(ii)(G);

               (h) [ ] A savings association as defined in Section 3(b) of the
                       Federal Deposit Insurance Act;

               (i) [ ] A church plan that is excluded from the definition of an
                       investment company under Section 3(c)(14) of the
                       Investment Company Act;

               (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).


ITEM 4.        OWNERSHIP.

Provide the following information regarding the aggregate number and percentage
of the class of securities of the issuer identified in Item 1.

          (a)  Amount beneficially owned:

          The responses of the Reporting Persons to Row (9) of the cover pages
          of this Schedule 13G are incorporated herein by reference. As of May
          9, 2006, the Reporting Persons beneficially owned, in the aggregate,
          6,890,351 shares of Common Stock, representing approximately 5.6% of
          the Common Stock (based on 123,758,521 shares of Common Stock
          outstanding as of February 28, 2006, as set forth in the Issuer's Form
          10-K filed with the SEC on February 28, 2006).

          (b)  Percent of class:

          The responses of the Reporting Persons to Row (11) of the cover pages
          of this Schedule 13G are incorporated herein by reference. As of May
          9, 2006, the Reporting Persons beneficially owned, in the aggregate,
          6,890,351 shares of Common Stock, representing approximately 5.6% of
          the Common Stock (based on 123,758,521 shares of Common Stock
          outstanding as of February 28, 2006, as set forth in the Issuer's Form
          10-K filed with the SEC on February 28, 2006).

          (c)  Number of shares as to which the person has:

              (i)    Sole power to vote or to direct the vote:
              (ii)   Shares power to vote or to direct the vote:
              (iii)  Sole power to dispose or to direct the disposition of:
              (iv)   Shared power to dispose or to direct the disposition of:

          The responses of the Reporting Persons to Rows (5) through (8) of the
          cover pages of this statement on Schedule 13G are incorporated herein
          by reference.

ITEM 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

               Not Applicable.

ITEM 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

               Not Applicable.

ITEM 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
               ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
               COMPANY.

               Not Applicable.


                                   Page 6 of 8

ITEM 8.       IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

              Not Applicable.

ITEM 9.       NOTICE OF DISSOLUTION OF GROUP.

              Not Applicable.

ITEM 10.      CERTIFICATION.

           By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.


                                    SIGNATURE
                                    ---------

           After reasonable inquiry and to the best of their knowledge and
belief, the undersigned certify that the information set forth in this statement
is true, complete and correct.

Dated: May 9, 2006

Heyman Investment Associates Limited Partnership


By:   /s/ James D. Hoffman
     --------------------------------------
     James D. Hoffman
     Chief Investment Officer

Heyvestco LLC


By:  /s/ James R. Mazzeo
     --------------------------------------
     James R. Mazzeo
     Treasurer


Samuel J. Heyman


By:   /s/ James R. Mazzeo
     --------------------------------------
     James R. Mazzeo
     Attorney-in-Fact for Samuel J. Heyman





                                   Page 7 of 8


                                 EXHIBIT INDEX



Exhibit No.             Description
-----------             -----------

   24.1                 Power of Attorney, dated as of May 9, 2006.

   99.1                 Agreement of Joint Filing among the Reporting Persons,
                        dated as of May 9, 2006.

















                                  Page 8 of 8