EXHIBIT 4.2
                          FIRST SUPPLEMENTAL INDENTURE

         FIRST  SUPPLEMENTAL  INDENTURE,  dated as of  November  3,  1998  (this
"Supplemental  Indenture"),  among  UCAR  Global  Enterprises  Inc.,  a Delaware
corporation (the "Company"), UCAR International Inc., a Delaware corporation, as
Guarantor  ("UCAR"),  and United  States  Trust  Company of New York, a New York
corporation, as Trustee (the "Trustee").

                              W I T N E S S E T H:

         WHEREAS,  the  parties  hereto  are also the  parties  to that  certain
indenture,  dated as of January 15, 1995 (the "Indenture"),  relating to the 12%
Senior Subordinated Notes due 2005 issued by the Company (the "Securities");

         WHEREAS, in accordance with Section 9.02 of the Indenture,  the parties
hereto have agreed to amend,  and the registered  holders of at least a majority
in principal  amount at maturity of the  Securities  outstanding  as of the date
hereof have consented (the "Requisite Consents") to amendments to, certain terms
of the Indenture as described below:; and

         WHEREAS,  all things  necessary to make this  Supplemental  Indenture a
valid  supplement to the Indenture  according to the terms of the Indenture have
been done;

         NOW, THEREFORE, the parties hereto agree as follows:

         SECTION 1. CERTAIN  TERMS  DEFINED IN THE  INDENTURE.  All  capitalized
terms used herein  without  definition  herein shall have the meanings  ascribed
thereto in the Indenture.

         SECTION 2. AMENDMENTS TO THE INDENTURE. The Indenture is hereby amended
 as follows:

                  (a) The first sentence of the definition of "Consolidated Cash
Flow" contained in Section 1.01 of the Indenture is hereby amended to delete the
word  "and"  appearing  immediately  before  clause  (vi)  and  to  add a  comma
immediately  following  clause (vi) and to add the  following  new clause  (vii)
immediately  after  such  added  comma  and  before  the  word  "and"  appearing
immediately after clause (vi):

                           and  (vii)  the  $340  million  charge  taken  by the
                  Company  against  results of operations for 1997 for potential
                  liabilities  and expenses in  connection  with  antitrust  and
                  related lawsuits and claims

                  (b) Section  4.03(f) of the  Indenture  is hereby  amended and
restated in its  entirety to read as follows:

                           (f)  Notwithstanding  Section 4.03(b),  no Restricted
                  Subsidiary may Incur Indebtedness  pursuant to Section 4.03(b)
                  unless (i) either (x) such Restricted  Subsidiary is a Foreign
                  Restricted   Subsidiary  or  (y)  such  Indebtedness  is  Bank
                  Indebtedness  and  (ii)  at the  time  of


                  Incurrence  of such  Indebtedness,  and  after  giving  effect
                  thereto, the aggregate  outstanding amount of Indebtedness (x)
                  of  Foreign  Restricted   Subsidiaries  Incurred  pursuant  to
                  Section 4.03(c)(ii),  together with the aggregate  outstanding
                  amount of  Indebtedness  of  Foreign  Restricted  Subsidiaries
                  Incurred   pursuant  to  Section   4.03(b)   (excluding   Bank
                  Indebtedness  described  in clause  (y) of clause  (i) of this
                  Section  4.03(f)),  shall not exceed the  aggregate  amount of
                  Indebtedness  of  Foreign  Restricted   Subsidiaries  that  is
                  outstanding  immediately  following the Issue Date pursuant to
                  Section   4.03(c)(ii)  and  (y)  that  is  Bank   Indebtedness
                  (including   Indebtedness   Incurred   pursuant   to   Section
                  4.03(c)(i)  or 4.03  (c)(ii))  shall not exceed $830  million;
                  provided, however, that Indebtedness of any Foreign Restricted
                  Subsidiary Incurred pursuant to Section 4.03(b) or 4.03(c)(ii)
                  shall not be  subordinated  in right of  payment  to any other
                  Indebtedness of such Foreign Restricted Subsidiary.

         For purposes of this amendment and restatement of Section 4.03(f),  the
$695  million  mentioned  in the  definition  of Credit  Agreement  shall not be
construed to limit the amount of Bank  Indebtedness  which may be Incurred under
Section  4.03(f) and the Company and its Restricted  Subsidiaries  shall replace
the Issuer mentioned in the definition of Bank Indebtedness.

         (c)  Section  4.03(c)(vi)  is hereby  amended by adding  the  following
language at the end of such clause after the word "million":

                  "and   provided   that  no  more  than  $25  million  of  Bank
                  Indebtedness Incurred pursuant to this Section 4.03(c)(vi) may
                  be outstanding at any one time."

         SECTION 3. GOVERNING LAW. This Supplemental Indenture shall be governed
by, and  construed  in  accordance  with,  the laws of the State of New York but
without giving effect to applicable principles of conflicts of law to the extent
that the  application  of the laws of  another  jurisdiction  would be  required
thereby.

         SECTION 4. COUNTERPARTS.  This Supplemental  Indenture may be signed in
any number of  counterparts,  each of which shall be an original,  with the same
effect as if the signatures thereto and hereto were upon the same instrument.

         SECTION 5.  RATIFICATION.  Except as  expressly  amended  hereby,  each
provision of the Indenture shall remain in full force and effect and, as amended
hereby,  the Indenture is in all respects  ratified and confirmed by each of the
Company, UCAR and the Trustee.

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         IN WITNESS  WHEREOF,  the parties hereto have caused this  Supplemental
Indenture to be duly executed as of the date first above written.

                                     UCAR INTERNATIONAL INC.


                                     By:__________________________________ 
                                     Title:



                                     UCAR GLOBAL ENTERPRISES INC.


                                     By:__________________________________    
                                     Title:



                                     UNITED STATES TRUST COMPANY
                                      OF NEW YORK, as Trustee


                                     By:__________________________________    
                                     Title:




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