EXHIBIT 4.10
                                                                EXECUTION COPY

                                VITRO GUARANTY

     THIS GUARANTY (this "Guaranty") dated as of April 2, 2004, is made by
VITRO, S.A. DE C.V., a corporation ("sociedad anonima de capital variable")
organized under the laws of the United Mexican States (the "Guarantor"), in
favor of the Tranche A Lenders and the Administrative Agent.

                             W I T N E S S E T H:

     WHEREAS, pursuant to that certain Credit Agreement, dated as of April 2,
2004 (as amended, supplemented or otherwise modified from time to time, the
"Credit Agreement"), among Vitrocrisa Comercial, S. de R.L. de C.V., a
corporation (sociedad de responsabilidad limitada de capital variable)
organized and existing under the laws of Mexico ("Comercial"), Vitrocrisa, S.
de R.L. de C.V., a corporation (sociedad de responsabilidad limitada de
capital variable) organized and existing under the laws of Mexico
("Vitrocrisa"), the Lenders, Bank of Montreal, as the Administrative Agent,
HSBC Bank USA and HSBC Mexico, S.A., Institucion de Banca Multiple, Grupo
Financiero HSBC, as Collateral Agents, and Harris Nesbitt and Banco Nacional
de Mexico, S.A., as the Joint Lead Arrangers, among other things, the Tranche
A Lenders have extended Tranche A Loans to Comercial; and

     WHEREAS, the Guarantor has duly authorized the execution, delivery and
performance of this Guaranty; and

     WHEREAS, it is in the best interests of the Guarantor to execute this
Guaranty inasmuch as the Guarantor will derive substantial direct and indirect
benefits from the Tranche A Loans made from time to time to Comercial pursuant
to the Credit Agreement;

     NOW THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, and in order to induce the
Tranche A Lenders to make the Tranche A Loans pursuant to the Credit
Agreement, the Guarantor agrees, for the benefit of the Tranche A Lenders and
the Administrative Agent, as follows:

                                  ARTICLE I.

                                  DEFINITIONS

     SECTION 1.1 Certain Terms. The following terms when used in this
Guaranty, including its preamble and recitals, shall have the following
meanings (such definitions to be equally applicable to the singular and plural
forms thereof):

     "Additional Costs" is defined in Section 6.12 hereof.

     "Comercial" is defined in the first recital.

     "Credit Agreement" is defined in the first recital.

     "Guaranteed Obligations" is defined in Section 2.1 hereof.

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     "Guarantor" is defined in the preamble.

     "Guarantor Default" means any Guarantor Event of Default or any event,
act or condition which, with notice or lapse of time, or both, would
constitute a Guarantor Event of Default.

     "Guarantor Event of Default" is defined in Article V hereof.

     "Guaranty" is defined in the preamble.

     "Information Memorandum" means that certain $75,000,000 Senior Credit
Facility Confidential Information Memorandum dated January 2004 furnished to
the Lenders.

     "SHCP" is defined in Section 6.12 hereof.

     "Vitrocrisa" is defined in the first recital.

     SECTION 1.2 Credit Agreement Definitions. Unless otherwise defined herein
or the context otherwise requires, capitalized terms used in this Guaranty
have the meanings provided in the Credit Agreement.

                                 ARTICLE II.

                              GUARANTY PROVISIONS

     SECTION 2.1 Guaranty. (a) The Guarantor hereby absolutely,
unconditionally and irrevocably guarantees the full and prompt payment when
due, whether at stated maturity, by acceleration or otherwise, and at all
times thereafter, of the Tranche A Loans, and all interest, fees and all other
monetary Obligations of Vitrocrisa and/or Comercial to each of the Tranche A
Lenders and the Administrative Agent relating to the Tranche A Loans or the
Tranche A Commitments, howsoever created, arising or evidenced, whether direct
or indirect, absolute or contingent, now or hereafter existing, or due or to
become due, which arise out of or in connection with the Credit Agreement or
any other Transaction Document, in each case as the same may be amended,
modified, extended or renewed from time to time (all such obligations being
herein collectively called the "Guaranteed Obligations"); provided, however,
that the maximum amount of the Guarantor's obligations with respect to the
Guaranteed Obligations shall be subject to Section 2.1(b) and Section 2.1(c).

     This Guaranty constitutes a guaranty by the Guarantor of payment when due
and not of collection, and the Guarantor specifically agrees that it shall not
be necessary or required that the Administrative Agent or any Tranche A Lender
or any other Person exercise any right, assert any claim or demand or enforce
any remedy whatsoever against Vitrocrisa and/or Comercial (or any other
Person) before or as a condition to the obligations of the Guarantor
hereunder.

     (b) Any term or provision of this Guaranty or any other Transaction
Document to the contrary notwithstanding, the aggregate maximum amount of the
Guaranteed Obligations for which the Guarantor shall be liable shall not
exceed the maximum amount for which the Guarantor can be liable without
rendering this Guaranty or any other Transaction Document as it


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relates to the Guarantor, voidable under applicable law relating to fraudulent
conveyance or fraudulent transfer.

     (c) Any term or provision of this Guaranty or any other Transaction
Document to the contrary notwithstanding, the aggregate maximum amount of the
Guaranteed Obligations for which the Guarantor shall be liable with respect to
the principal amount of the Tranche A Loans shall not exceed (x) $52,000,000
minus (y) any principal amounts of the Tranche A Term Loans indefeasibly paid
in cash and any principal amounts of the Tranche A Revolving Loans
indefeasibly paid in cash to the extent the Tranche A Revolving Commitments
have been permanently reduced with respect to such payment, or such higher
amount as the Guarantor shall have agreed to in writing, provided, that the
foregoing shall limit Guarantor's obligations for principal of the Tranche A
Loans but shall not limit or impair the Guarantor's obligation on interest,
fees, costs, expenses or any other Guaranteed Obligation.

     SECTION 2.2 Acceleration of Guaranty. The Guarantor agrees that, in the
event of any Event of Default under Section 9.6 of the Credit Agreement, and
if such event shall occur at a time when any of the Guaranteed Obligations are
not then due and payable, the Guarantor shall pay to the Administrative Agent
for the account of the Administrative Agent and the Tranche A Lenders
forthwith the full amount which would be payable hereunder by the Guarantor if
all such obligations were then due and payable.

     SECTION 2.3 Guaranty Absolute, etc. This Guaranty shall in all respects
be a continuing, absolute, unconditional and irrevocable guaranty of payment
by the Guarantor, and shall remain in full force and effect until all
Guaranteed Obligations have been paid in full, finally and indefeasibly, and
the Tranche A Commitments shall have terminated. The Guarantor guarantees that
the Guaranteed Obligations shall be paid strictly in accordance with the terms
of the Credit Agreement and each other Transaction Document under which they
arise, regardless of any law, regulation or order now or hereafter in effect
in any jurisdiction affecting any of such terms or the rights of the
Administrative Agent or any Tranche A Lender or any other Person with respect
thereto. The liability of the Guarantor under this Guaranty shall be absolute,
unconditional and irrevocable irrespective of:

          (a) any lack of validity, legality or enforceability of the Credit
Agreement or any other Transaction Document;

          (b) the failure of the Administrative Agent, the Collateral Agent,
any Lender or any other Person:

               (i) to assert any claim or demand or to enforce any right or
          remedy against Vitrocrisa, Comercial, any US Affiliate, Libbey or
          any other Person (including any other guarantor) under the
          provisions of the Credit Agreement, any other Transaction Document
          or otherwise, or

               (ii) to exercise any right or remedy against any other
          guarantor of, or collateral securing, any Guaranteed Obligations or
          any of the other Obligations;

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               (c) any change in the time, manner or place of payment of, or
          in any other term of, all or any of the Guaranteed Obligations or
          any of the other Obligations, or any other extension, compromise or
          renewal of any Guaranteed Obligation or any of the other
          Obligations;

               (d) any reduction, limitation, impairment or termination of any
          Guaranteed Obligations or any of the other Obligations for any
          reason (other than payment), including any claim of waiver, release,
          surrender, alteration or compromise, and shall not be subject to
          (and the Guarantor hereby waives any right to or claim of) any
          defense or setoff, counterclaim, recoupment or termination
          whatsoever by reason of the invalidity, illegality, nongenuineness,
          irregularity, compromise, unenforceability of, or any other event or
          occurrence (other than indefeasible payment in full in cash of the
          Guaranteed Obligations) affecting, any Guaranteed Obligations or any
          of the other Obligations;

               (e) any amendment to, rescission, waiver, or other modification
          of, or any consent to departure from, any of the terms of the Credit
          Agreement or any other Transaction Document including without
          limitation any amendment, rescission, waiver or other modification
          or consent which results in an increase in the amount of the
          Obligations;

               (f) (i) any addition, exchange, release, surrender or
          non-perfection of any collateral or (ii) any amendment to or waiver
          or release or addition of, or consent to departure from, any other
          guaranty held by the Administrative Agent, the Collateral Agent or
          any Lender, securing or supporting any of the Guaranteed Obligations
          or any of the other Obligations; or

               (g) any other circumstance (other than payment) which might
          otherwise constitute a defense available to, or a legal or equitable
          discharge of, the Guarantor, Vitrocrisa, Comercial, Libbey, any US
          Affiliate, any surety or any other guarantor.

     SECTION 2.4 Marshaling, Reinstatement. The Guarantor agrees that none of
the Tranche A Lenders nor any Agent nor any Person acting for or on behalf of
the Tranche A Lenders or any Agent shall have any obligation to marshal any
assets in favor of the Guarantor or against or in payment of any or all of the
Guaranteed Obligations. If the Guarantor or any other guarantor of all or any
part of the Guaranteed Obligations makes a payment to any Tranche A Lender or
any Agent, or if any Tranche A Lender or any Agent receives any proceeds of
collateral, which payment or any part thereof is subsequently invalidated,
declared to be fraudulent or preferential, set aside and/or required to be
repaid to the Guarantor, such other guarantor or any other Person, or their
respective estates, trustees, receivers or any other party, including without
limitation, Comercial or Vitrocrisa, under any bankruptcy law, "concurso
mercantil", state or federal law, common law or equitable cause, then, to the
extent of such payment or repayment, the part of the Guaranteed Obligations
which has been paid, reduced or satisfied by such amount shall be reinstated
and continued in full force and effect as of the time immediately preceding
such initial payment, reduction or satisfaction.


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     SECTION 2.5 Waiver, etc. The Guarantor hereby waives promptness,
diligence, notice of acceptance and any other notice with respect to any of
the Guaranteed Obligations and this Guaranty and any requirement that the
Administrative Agent, the Collateral Agent or any Lender protect, secure,
perfect or insure any security interest or Lien, or any property subject
thereto, or exhaust any right or take any action against Vitrocrisa,
Comercial, Libbey, any US Affiliate or any other Person (including any other
guarantor) or entity or any collateral securing any Guaranteed Obligations or
any of the other Obligations.

     The Guarantor hereby expressly waives any right, beneficio de orden,
division and excusion and any of the rights provided for in Articles 2813,
2814, 2815, 2816, 2817, 2818, 2820, 2821, 2822, 2823, 2836, 2840, 2842, 2844,
2845, 2846, 2847, 2848, 2849 et al of the Federal Civil Code and the
corresponding provisions of the Civil Code for the Federal District of Mexico
and of the civil codes for all the states of Mexico, which are not reproduced
herein inasmuch as the Guarantor hereby represents to be familiar with the
contents thereof, as well as all other rights and defenses the assertion or
exercise of which would in any way diminish the liability of the undersigned
hereunder.

     Without limiting the generality of the foregoing, the Guarantor hereby
acknowledges and agrees that it shall not be a third party beneficiary to the
Credit Agreement or any other Transaction Document.

     SECTION 2.6 Waiver of Subrogation and Contribution. Until the Obligations
have been paid in cash indefeasibly in full and the Commitments by the Lenders
shall have terminated, the Guarantor hereby irrevocably waives any claim or
other rights which it may now or hereafter acquire against Vitrocrisa and/or
Comercial or any other Person that arise from the existence, payment,
performance or enforcement of the Guarantor's obligations under this Guaranty
or any other Transaction Document, including any right of subrogation,
reimbursement, contribution, exoneration, or indemnification, any right to
participate in any claim or remedy of the Administrative Agent or any Lender
against Vitrocrisa, Comercial or any other Person or any collateral which the
Administrative Agent, the Collateral Agent or any Lender now has or hereafter
acquires, whether or not such claim, remedy or right arises in equity, or
under contract, statute or common law, including the right to take or receive
from Vitrocrisa, Comercial or any other Person, directly or indirectly, in
cash or other property or by set-off or in any manner, payment or security on
account of such claim or other rights. If any amount shall be paid to the
Guarantor in violation of the preceding sentence and the Obligations shall not
have been paid in cash indefeasibly in full and the Commitments shall not have
been terminated, such amount shall be deemed to have been paid to the
Guarantor for the benefit of, and held in trust for, the Administrative Agent
and the Lenders, and shall forthwith be paid to the Administrative Agent for
the account of the Administrative Agent and the Lenders to be credited and
applied upon the Obligations, whether matured or unmatured. The Guarantor
acknowledges that it will receive direct and indirect benefits from the
financing arrangements contemplated by the Credit Agreement and that the
waiver set forth in this Section is knowingly made in contemplation of such
benefits. If (a) the Guarantor has made payment to the Administrative Agent
and the Tranche A Lenders of all or any part of the Guaranteed Obligations and
(b) the Obligations have been paid in full and the Commitments have been
terminated, the Administrative Agent and the Tranche A Lenders agree to
execute and deliver to the Guarantor appropriate documents


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(without recourse and without representation and warranty) necessary to
evidence the transfer by subrogation to the Guarantor of an interest in the
Guaranteed Obligations resulting from such payment by the Guarantor.

     SECTION 2.7 Cooperation in Defense of Liens, etc. The Guarantor agrees
that it will not take any action to challenge or otherwise contest the
validity, perfection, priority or enforceability of the Liens created by the
Collateral Documents or the priority of payment provisions contained in the
Credit Agreement or any of the other Transaction Documents. The Guarantor
assumes responsibility for keeping itself informed of the financial condition
of Comercial and Vitrocrisa and of all other circumstance bearing upon the
risk of nonpayment of the Guaranteed Obligations and the Guarantor hereby
agrees that none of the Administrative Agent, the Collateral Agent or any
Lender shall have any duty to advise the Guarantor of any information
regarding such condition or any such circumstances.

                                 ARTICLE III.

                        REPRESENTATIONS AND WARRANTIES

     To induce the Tranche A Lenders to make the Tranche A Loans under the
Credit Agreement, the Guarantor represents and warrants to the Administrative
Agent and the Tranche A Lenders that:

     SECTION 3.1 Organization, etc. The Guarantor is duly organized and
validly existing under the laws of its jurisdiction of formation; the
Guarantor is duly qualified to do business in each jurisdiction where the
nature of its business makes such qualification necessary, except where the
failure to be so qualified could not reasonably be expected to have a Material
Adverse Effect with respect to the Guarantor; and the Guarantor has full
corporate power and authority to own its property and conduct its business as
presently conducted by it.

     SECTION 3.2 Authorization; No Conflict. The execution and delivery by the
Guarantor of this Guaranty and each of the Tranche A Notes, and the
performance by the Guarantor of its obligations under this Guaranty and each
of the Tranche A Notes, are within the corporate powers of the Guarantor, have
been duly authorized by all necessary corporate action on the part of the
Guarantor (including any necessary shareholder action), and do not and will
not (a) violate any provision of law which is binding on the Guarantor, (b)
contravene or conflict with, or result in a breach of, any provision of the
organizational documents of the Guarantor or of any material agreement,
indenture, instrument or other document, or any judgment, order or decree,
which is binding on the Guarantor or (c) result in, or require, the creation
or imposition of any Lien on any property of the Guarantor.

     SECTION 3.3 Validity and Binding Nature. Each of this Guaranty and the
Tranche A Notes is and, in the case of Tranche A Notes to be executed after
the date hereof upon execution thereof will be, the legal, valid and binding
obligation of the Guarantor, enforceable against the Guarantor in accordance
with its terms, except that enforceability may be limited by bankruptcy,
insolvency, concurso mercantil, fraudulent conveyance, fraudulent transfer,
reorganization, moratorium or other similar laws now or hereafter in effect
relating to creditors' rights generally


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and by general principles of equity (regardless of whether enforcement is
sought in equity or at law).

     SECTION 3.4 Benefit to Guarantor. The Guarantor's guarantee pursuant to
this Guaranty reasonably may be expected to benefit, directly or indirectly,
the Guarantor and that such guarantee and other obligations are necessary and
convenient to the conduct, promotion and attainment of the business of the
Guarantor.

     SECTION 3.5 Governmental Approvals. No Governmental Approval or consent
or approval of any other Person is required to authorize, or is required in
connection with (i) the execution, delivery and performance by the Guarantor
of this Guaranty or any Tranche A Note, or (ii) the legality, validity,
binding effect or enforceability against the Guarantor of this Guaranty or of
any Tranche A Note.

     SECTION 3.6 Litigation. There is no litigation, action, suit,
investigation, claim or proceeding pending or, to the knowledge of the
Guarantor, threatened with respect to this Guaranty or any Tranche A Note or
the transactions contemplated hereby. There is no litigation, action, suit,
investigation, claim or proceeding pending or, to the knowledge of the
Guarantor, threatened which could reasonably be expected to have a Material
Adverse Effect on the Guarantor.

     SECTION 3.7 Solvency. The Guarantor (i) is Solvent as of the date hereof
and will not be rendered insolvent as a result of this Guaranty, (ii) is not
engaged in a business or a transaction, or about to engage in a business or a
transaction, for which any property or assets remaining with the Guarantor
would be unreasonably small capital, and (iii) does not intend to incur, or
believe it will incur, debts that will be beyond its ability to pay as such
debts mature.

     SECTION 3.8 Financial Statements; No Material Adverse Change; Liens.

          (a) (i) The audited consolidated balance sheet of the Guarantor as
     at December 31, 2003, and each of the related statements of income and
     retained earnings and changes in financial position of the Guarantor for
     the twelve-month period then ended, and (ii) the consolidated balance
     sheet of the Guarantor as at September 30, 2003, and the related
     statements of income and retained earnings and changes in financial
     position of the Guarantor for the nine-month period then ended,
     heretofore furnished to the Administrative Agent were prepared in
     accordance with GAAP and, on that basis, fairly present the financial
     condition and results of operations of the Guarantor as at the dates and
     for the periods covered thereby subject to, in the case of the financial
     statements described in clause (ii) above, the absence of footnote
     disclosure and normal year-end audit adjustments.

          (b) Since December 31, 2003, there has been no material adverse
     change in the business, operations, property, assets, liabilities,
     condition (financial or otherwise) or prospects of the Guarantor.

          (c) To the Guarantor's best knowledge and except as fully disclosed
     in the financial statements referred to in Section 3.8(a), there are no
     liabilities or obligations


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     with respect to the Guarantor or its Subsidiaries of any nature
     whatsoever (whether absolute, accrued, contingent or otherwise and
     whether or not due) which, either individually or in the aggregate, would
     be material to the Guarantor or Comercial. The Guarantor knows of no
     basis for the assertion against the Guarantor or Comercial or their
     respective Subsidiaries of any liability or obligation of any nature
     whatsoever that is not fully disclosed in the financial statements
     referred to in Section 3.8(a) which, either individually or in the
     aggregate, are likely to have a Material Adverse Effect on Comercial or
     the Guarantor.

     SECTION 3.9 True and Complete Disclosure. All information, reports,
financial statements, exhibits and schedules contained in the Information
Memorandum and all information listed in Schedule 3.9 hereto and all factual
information as contained in the Transaction Documents including the exhibits
and schedules thereto, and all other such factual information (taken as a
whole) hereafter furnished by or on behalf of the Guarantor, in writing, to
the Administrative Agent, the Collateral Agent or any Lender, will be true and
accurate in all material respects on the date as of which such information is
dated or certified, provided that no such representation or warranty is made
as to any projections or forward-looking information contained therein except
that such projections or forwarding-looking information have been prepared in
good faith on assumptions believed to be reasonable at the time of preparation
thereof. There are in existence no documents or agreements which have not been
disclosed to the Lenders which are material in the context of the Transaction
Documents or which have the effect of varying any of the Transaction
Documents.

     SECTION 3.10 Investment Company Act. The Guarantor is not an "investment
company" within the meaning of the Investment Company Act of 1940, as amended.

     SECTION 3.11 Public Utility Holding Company Act. The Guarantor is not a
"holding company," or a "subsidiary company" of a "holding company," or an
"Affiliate" of a "holding company" or of a "subsidiary company" of a "holding
company" within the meaning of the Public Utility Holding Company Act of 1935,
as amended.

                                 ARTICLE IV.

                      AFFIRMATIVE AND NEGATIVE COVENANTS

     The Guarantor covenants and agrees that on and after the Closing Date and
until the Tranche A Notes, and all other Guaranteed Obligations are paid in
full:

     SECTION 4.1 Information Covenants.

     Guarantor will furnish or cause to be furnished to the Administrative
Agent for distribution to each Tranche A Lender:

          (a) Annual Financial Statements. As soon as available, but, in any
     event, within 120 days after the close of each fiscal year of Guarantor,
     the consolidated balance sheet of the Guarantor and its Consolidated
     Subsidiaries for such fiscal year, together with the related consolidated
     statements of income and retained earnings and

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     statements of changes in financial position for such fiscal year
     certified by independent public accountants of recognized
     international standing selected by the Guarantor, and in each case
     pursuant to an unqualified opinion of such independent public
     accountants, and together with a report of such accounting firm
     stating that in the course of its regular audit of the consolidated
     financial statements of the Guarantor and its Consolidated
     Subsidiaries, which audit was conducted in accordance with GAAP
     consistently applied, such accounting firm obtained no knowledge of
     any Guarantor Default or Guarantor Event of Default.

          (b) Quarterly Financial Statements. As soon as available, but, in
     any event, within 60 days after the close of each quarterly accounting
     period in each fiscal year of the Guarantor, a copy of the unaudited
     balance sheet of the Guarantor and its Consolidated Subsidiaries for such
     period, together with the related statements of income and retained
     earnings and statements of changes in financial position for such
     quarterly period, certified by the principal executive officer, the
     principal financial officer or another authorized executive officer of
     the Guarantor, who in such capacity has actual knowledge of the matters
     to which he or she is certifying, as prepared in accordance with GAAP
     consistently applied, subject to normal recurring year-end adjustments
     and the absence of certain footnotes to such financial statements.

          (c) Officer's Certificates. As soon as available, but in any event,
     within 45 days after the close of each quarterly accounting period in
     each fiscal year of the Guarantor, a certificate signed by the Corporate
     Controller, the Corporate Director or the Finance Director of the
     Guarantor to the effect that, to the best of his knowledge, no Guarantor
     Default or Guarantor Event of Default has occurred and is continuing.

          (d) Notice of Default or Litigation, etc. Promptly upon an officer
     of the Guarantor obtaining knowledge thereof, written notice of (i) the
     occurrence of any event which constitutes a Default or Event of Default
     (including the details thereof and the action that the Guarantor has
     taken or proposes to take with respect thereto), (ii) any material
     action, litigation, suit or governmental proceeding pending or threatened
     against Vitrocrisa, Comercial or the Guarantor before any court or
     governmental department, commission, board, bureau, agency or
     instrumentally, domestic or foreign (x) which could reasonably be
     expected to have a Material Adverse Effect on Vitrocrisa, Comercial or
     Guarantor or (y) with respect to this Guaranty and the Tranche A Notes,
     and (iii) any other event which could reasonably be expected to have a
     Material Adverse Effect on Vitrocrisa, Comercial or Guarantor.

          (e) Other Information. From time to time, such other information or
     documents (financial, fiscal or otherwise) as any Tranche A Lender and/or
     the Administrative Agent may reasonably request.

     SECTION 4.2 Books, Records and Inspections; Accounting Matters; Provision
of Certain Financial Statements. The Guarantor shall, and shall cause each of
its Subsidiaries to, keep proper books of record and account adequate to
reflect truly and fairly the financial condition and results of operations of
the Guarantor and its Subsidiaries and in which full, true and correct entries
in conformity with GAAP consistently applied and all requirements of Law


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shall be made of all dealings and transactions in relation to its business and
activities. At any time when securities of the Guarantor or any of its
Subsidiaries are held by the public, promptly upon the delivery or filing
thereof, the Guarantor shall deliver to the Administrative Agent a copy of all
reports and registration statements that such Guarantor or such Subsidiary
files with the Securities and Exchange Commission of the United States of
America or the Comision Nacional Bancaria y de Valores or any Mexican or other
securities authority or exchange.

     SECTION 4.3 Modification of Certain Agreements. The Guarantor will not
amend or modify, or permit the amendment or modification of, any provision of
the Intercompany Note or this Guaranty without the prior written consent of
the Administrative Agent acting with the consent of the Required Lenders
pursuant to Section 12.14 of the Credit Agreement.

                                  ARTICLE V.

                          GUARANTOR EVENTS OF DEFAULT

     Each of the following specified events or occurrences shall constitute a
"Guarantor Event of Default":

     SECTION 5.1 Payment Default Under Other Agreements. The Guarantor shall
default in any payment of any of its Indebtedness, other than the Guaranteed
Obligations, having a principal amount in excess of U.S.$25,000,000 (or its
equivalent in any other currency), either individually or in the aggregate, as
the same shall become due and payable beyond the period of grace, if any,
provided in the instrument or agreement under which such Indebtedness was
created; or

     SECTION 5.2 Acceleration of Indebtedness. An event or occurrence
constituting a default, termination event or breach under the terms of any
Indebtedness of the Guarantor (other than this Guaranty) having a principal
amount in excess of U.S.$25,000,000 (or its equivalent in any other currency),
either individually or in the aggregate, and such default, termination event
or breach results in the acceleration of the maturity of such Indebtedness; or

     SECTION 5.3 Bankruptcy, etc. (a) There is entered against the Guarantor a
decree or order by a court under the Bankruptcy Code or any other applicable
law which shall remain in effect for a period of 60 days after entry (i)
adjudging the Guarantor bankrupt, insolvent or in concurso mercantil, (ii)
approving as properly filed a petition seeking reorganization, arrangement,
adjustment or composition of or in respect of the Guarantor under any
applicable law, (iii) appointing a receiver, "visitador", "conciliador",
"sindico", "interventor", liquidator, assignee, trustee, sequestrator (or
other similar official) of the Guarantor or of any substantial part of its
property or other assets, or (iv) ordering the winding up or liquidation of
its affairs; or (b) (i) the Guarantor or any of its Subsidiaries (A)
institutes proceedings or takes any form of corporate action to be liquidated
or adjudicated bankrupt, insolvent, in suspension of payments or in concurso
mercantil, (B) consents to the institution of bankruptcy (concurso mercantil)
or insolvency proceedings against it, (C) files a petition or consent seeking
reorganization, suspension of payments, concurso mercantil or relief under any
applicable law or consents to the filing of any such petition or to the
appointment of a receiver, "visitador", "conciliador", "sindico",
"interventor", liquidator, assignee, trustee, sequestrator (or other similar
official) of


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the Guarantor or such Subsidiary or of any substantial part of their
respective property, (D) makes a general assignment for the benefit of
creditors, or (E) admits in writing its inability to pay its debts generally
as they become due or otherwise becomes insolvent, or (ii) any trust or
corporate action is taken by the Guarantor or any of its Subsidiaries for the
purpose of effecting any of the foregoing; or

     SECTION 5.4 Judgments. One or more final judgments or decrees for the
payment of money shall be entered against the Guarantor, involving in the
aggregate, a liability (not paid or fully covered by insurance except for
reasonable and customary deductibles) of the equivalent of U.S.$25,000,000 or
more, and all such judgments or decrees shall not have been vacated,
discharged or stayed or bonded pending appeal within 60 days after the entry
thereof; or

     SECTION 5.5 Cancellation of Payment Obligation. Any dominant authority
asserting or exercising de jure or de facto governmental or police powers in
Mexico shall, by moratorium laws or otherwise, cancel, suspend or defer the
obligation of the Guarantor to pay any amount required to be paid hereunder or
under the Tranche A Notes; or

     SECTION 5.6 Government Action. Any Government Agency shall have (a)
condemned, nationalized, seized, or otherwise expropriated all or
substantially all of the property or other assets of the Guarantor, (b)
assumed custody or control of such property or other assets, or of the
business or operations of the Guarantor, or (c) taken (i) any action for the
dissolution or disestablishment of the Guarantor or (ii) any action that would
prevent the Guarantor from carrying on a substantial part of its business; or

     SECTION 5.7 Failure of Enforceability. This Guaranty or any Tranche A
Note shall cease to be enforceable and in full force and effect, or the
Guarantor shall deny or disaffirm any of its obligations under this Guaranty
or under any Tranche A Note; or

     SECTION 5.8 Imposition of Exchange Restrictions. Any restriction or
requirement not in effect on the Closing Date shall have been imposed, whether
by legislative enactment, decree, regulation, order or otherwise, which limits
the Guarantor's ability to transfer foreign exchange for the purpose of
performing any obligation under this Guaranty or under any Tranche A Note
unless, within 30 days after the imposition of any such restriction or
requirement, the Guarantor shall have delivered to the Administrative Agent
evidence satisfactory to it that foreign exchange will be made available to it
for the purpose of performing its obligations under this Guaranty or under any
Tranche A Note; or

     SECTION 5.9 Guarantor Payment Defaults. The Guarantor shall fail to make
any payment due hereunder or under any Tranche A Note when due; or

     SECTION 5.10 Other Guarantor Defaults. The Guarantor shall default in the
due performance or observance by it of any term, covenant or agreement
contained in this Guaranty (other than those referred to in Section 5.9
hereof) and such default shall have continued unremedied for a period of 20
days after the earlier of (a) written notice thereof shall have been provided
to the Guarantor by any of the Lenders or the Administrative Agent, or (b) any
responsible officer of the Guarantor knows, or reasonably should have known,
of such default.


                                      11


<PAGE>


                                 ARTICLE VI.

                           MISCELLANEOUS PROVISIONS

     SECTION 6.1 Transaction Document. This Guaranty is a Transaction Document
executed pursuant to the Credit Agreement and shall (unless otherwise
expressly indicated herein) be construed, administered and applied in
accordance with the terms and provisions thereof.

     SECTION 6.2 Binding on Successors, Transferees and Assigns; Assignment of
Guaranty. This Guaranty shall be binding upon the Guarantor and its
successors, transferees and assigns, and all references herein to Vitrocrisa,
Comercial and the Guarantor, respectively, shall be deemed to include any of
such Person's successor or successors, whether intermediate or remote;
provided, however, that the Guarantor shall not have the right to assign any
of its obligations hereunder without the prior written consent of the
Administrative Agent and the Required Tranche A Lenders. Any Tranche A Lender
may from time to time, in accordance with Section 12.5 of the Credit
Agreement, without notice to the Guarantor, assign or transfer any or all of
the Guaranteed Obligations or any interest therein; and, notwithstanding any
such assignment or transfer or any subsequent assignment or transfer thereof,
such Guaranteed Obligations shall be and remain Guaranteed Obligations for the
purpose of this Guaranty, and each and every immediate and successive assignee
or transferee of any of the Guaranteed Obligations or of any interest therein
shall, to the extent of the interest of such assignee or transferee in the
Guaranteed Obligations, be entitled to the benefits of this Guaranty and shall
be protected to the same extent as if such assignee or transferee were an
initial Lender.

     SECTION 6.3 Amendments, etc. All amendments to or waivers of any
provision of this Guaranty, and all consents to any departure by the Guarantor
herefrom, shall comply in all respects with Section 12.14 of the Credit
Agreement, which is incorporated herein by reference, mutatis mutandis, as if
such terms were set forth in this Guaranty in full.

     SECTION 6.4 Addresses for Notices to the Guarantors. All notices
hereunder to the Guarantor shall be in writing (including via facsimile) and
shall be sent to it at the address or facsimile number set forth below its
signature hereto or at such other address or facsimile number as may be
designated by the Guarantor in a written notice received by the Administrative
Agent. Notices sent by facsimile transmission shall be effective when
received; notices sent by mail (including by courier) shall be deemed to have
been given or made when delivered; and notices sent by hand delivery shall be
deemed to have been received when received.

     SECTION 6.5 No Waiver; Remedies. In addition to, and not in limitation
of, Section 2.3, Section 2.5, and Section 2.7, no failure on the part of the
Administrative Agent, the Collateral Agent or any Lender to exercise, and no
delay in exercising, any right hereunder shall operate as a waiver thereof;
nor shall any single or partial exercise of any right hereunder preclude any
other or further exercise thereof or the exercise of any other right. The
remedies herein provided are cumulative and not exclusive of any remedies
provided by law. Pursuant to the Credit Agreement, (a) this Guaranty has been
delivered to the Administrative Agent and (b) the Administrative Agent has
been authorized to enforce this Guaranty on behalf of itself and each of the
Tranche A Lenders. All payments by the Guarantor pursuant to this Guaranty
shall


                                      12


<PAGE>


be made to the Administrative Agent and applied according to the terms of the
Credit Agreement for the ratable benefit of the Tranche A Lenders.

     SECTION 6.6 Section Captions. Section captions used in this Guaranty are
for convenience of reference only, and shall not affect the construction of
this Guaranty.

     SECTION 6.7 Fees and Expenses. The Guarantor further agrees to pay all
reasonable expenses (including reasonable attorneys' fees and legal expenses
from time to time invoiced) paid or incurred by the Administrative Agent or
any Lender in endeavoring to collect the Guaranteed Obligations pursuant to
this Guaranty, or any part thereof, and in enforcing this Guaranty against the
Guarantor or its successors or assigns.

     SECTION 6.8 Severability. Wherever possible each provision of this
Guaranty shall be interpreted in such manner as to be effective and valid
under applicable law, but if any provision of this Guaranty shall be
prohibited by or invalid under such law, such provision shall be ineffective
to the extent of such prohibition or invalidity, without invalidating the
remainder of such provision or the remaining provisions of this Guaranty.

     SECTION 6.9 Governing Law, Entire Agreement, Counterparts, etc. THIS
GUARANTY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF
THE STATE OF NEW YORK WITHOUT REGARD TO ITS CONFLICTS OF LAW PRINCIPLES (OTHER
THAN SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW). This Guaranty
and the other Transaction Documents constitute the entire understanding among
the parties hereto with respect to the subject matter hereof and thereof and
supersede any prior agreements, written or oral, with respect thereto. This
Guaranty may be executed in any number of counterparts and by the different
parties hereto on separate counterparts, and each such counterpart shall be
deemed to be an original, but all such counterparts shall together constitute
one and the same Guaranty. At any time after the date of this Guaranty, one or
more additional Persons or entities may become parties hereto by executing and
delivering to the Administrative Agent a counterpart of this Guaranty.
Immediately upon such execution and delivery (and without any further action),
each such additional Person or entity will become a party to, and will be
bound by all the terms of, this Guaranty.

     SECTION 6.10 Forum Selection And Consent To Jurisdiction. ANY LITIGATION
BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS GUARANTY
MAY BE BROUGHT AND MAINTAINED IN ANY NEW YORK STATE COURT OR FEDERAL COURT OF
THE UNITED STATES SITTING IN NEW YORK CITY AND ANY APPELLATE COURT FROM ANY
THEREOF. THE GUARANTOR AND, BY ACCEPTING THE BENEFITS OF THIS GUARANTY, EACH
OF THE TRANCHE A LENDERS HEREBY EXPRESSLY AND IRREVOCABLY SUBMITS TO THE
JURISDICTION OF SUCH COURTS FOR THE PURPOSE OF ANY SUCH LITIGATION AS SET
FORTH ABOVE. THE GUARANTOR AND, BY ACCEPTING THE BENEFITS OF THIS GUARANTY,
EACH OF THE TRANCHE A LENDERS HEREBY EXPRESSLY AND IRREVOCABLY WAIVES, TO THE
FULLEST EXTENT PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER
HAVE TO THE LAYING OF VENUE OF ANY SUCH LITIGATION


                                      13


<PAGE>


BROUGHT IN ANY SUCH COURT REFERRED TO ABOVE AND ANY CLAIM THAT ANY SUCH
LITIGATION HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. The Guarantor hereby
irrevocably appoints CT Corporation System (the "Process Agent"), with offices
at the date hereof at 111 Eighth Avenue, New York, New York 10011, United
States, as its agent to receive on behalf of the Guarantor and its property
service of copies of the summons and complaint and any other process which may
be served in any such action or proceeding. Such service may be made by
mailing or delivering a copy of such process to the Guarantor in care of the
Process Agent at the Process Agent's address, and the Guarantor hereby
irrevocably authorizes and directs the Process Agent to accept such service on
its behalf. As an alternative method of service, the Guarantor irrevocably
consents to the service of any and all process in any such action or
proceeding by the mailing of copies of such process to the Guarantor in the
manner set forth in Section 6.4 hereof.

     SECTION 6.11 Waiver of Jury Trial. THE GUARANTOR AND, BY ACCEPTING THE
BENEFITS HEREOF, THE ADMINISTRATIVE AGENT AND EACH TRANCHE A LENDER HEREBY
KNOWINGLY, VOLUNTARILY, AND INTENTIONALLY WAIVES ANY RIGHTS IT MAY HAVE TO A
TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT OF,
UNDER, OR IN CONNECTION WITH, THIS GUARANTY AND ANY AMENDMENT, INSTRUMENT,
DOCUMENT OR AGREEMENT DELIVERED OR WHICH MAY IN THE FUTURE BE DELIVERED IN
CONNECTION HEREWITH OR ARISING FROM ANY BANKING RELATIONSHIP EXISTING IN
CONNECTION WITH THE FOREGOING, AND AGREES THAT ANY SUCH ACTION OR PROCEEDING
SHALL BE TRIED BEFORE A COURT AND NOT A JURY.

     SECTION 6.12 Payments Free and Clear of Taxes. All payments to be made by
the Guarantor hereunder shall be made free and clear of, and without deduction
for or on account of, any present or future taxes, value-added taxes, levies,
imposts, duties, fees, assessments or other charges of whatever nature now or
hereafter imposed (in all cases excluding income taxes) and all interest,
penalties or similar liabilities with respect thereto (collectively,
"Additional Costs"); provided, however, that anything herein contained to the
contrary notwithstanding, the Guarantor shall not be required to pay
withholding taxes in excess of the amount of withholding taxes that would be
payable by a financial institution that is both (i) a resident of a country
with which Mexico has entered into a treaty for the avoidance of double
taxation which is in effect in such country and (ii) registered with the
Ministry of Finance and Public Credit of Mexico (the "SHCP") for purposes of
Article 195(I) of the Mexican Income Tax Law (or any successor provision).
Such withholding tax rate is currently 4.9%. If any Additional Costs are
required by Law to be deducted or withheld from, or in respect of, any sum
payable hereunder, the Guarantor agrees to pay, subject to the proviso in the
immediately foregoing sentence, the full amount of such Additional Costs and
such other additional amounts as may be necessary so that every payment of all
amounts due hereunder, after withholding or deduction for or on account of any
Additional Costs, will not be less than the amount provided for herein.
Subject to the proviso in


                                      14


<PAGE>


the first sentence of this Section 6.12, the Guarantor will furnish to the
Administrative Agent, within sixty (60) days after the date the payment of any
Additional Costs is due pursuant to applicable law, copies of tax forms
evidencing such payment by the Guarantor, duly stamped by or on behalf of the
SHCP or any other applicable Government Agency. Subject to the proviso in the
first sentence of this Section 6.12, the Guarantor will indemnify and hold
harmless the Administrative Agent or any Tranche A Lender, as the case may be,
and reimburse the Administrative Agent or any Tranche A Lender, as the case
may be, promptly upon its written request, for the amount of any Additional
Costs or other taxes described above which are levied or imposed on and paid
by the Administrative Agent or any Tranche A Lender, as the case may be.

     SECTION 6.13 Judgment. The obligations of the Guarantor, in respect of
any sum due to the Administrative Agent or any Tranche A Lender hereunder
shall, notwithstanding any judgment in a currency (the "Judgment Currency")
other than the currency in which such sum was originally denominated (the
"Original Currency"), be discharged only to the extent that following receipt
by the Administrative Agent or such Tranche A Lender of any sum adjudged to be
so due in the Judgment Currency, the Administrative Agent or such Tranche A
Lender, in accordance with normal banking procedures, could purchase the
Original Currency with the Judgment Currency. If the amount of Original
Currency so purchased is less than the sum originally due to the
Administrative Agent or such Tranche A Lender, the Guarantor agrees, as a
separate obligation and notwithstanding any such judgment, to indemnify the
Administrative Agent or such Tranche A Lender against such loss, and if the
amount of Original Currency so purchased exceeds the sum originally due to the
Administrative Agent or such Tranche A Lender, the Administrative Agent or
such Tranche A Lender agrees to remit such excess to the Guarantor.

     SECTION 6.14 Third Party Beneficiaries. The Tranche B Lenders and their
respective successors and assigns shall be third party beneficiaries to this
Guaranty with respect to Section 2.6 and Section 2.7 hereof and shall be
entitled to rely on the agreements contained in such Sections and to enforce
such Sections against the Guarantor.

                           [SIGNATURE PAGE FOLLOWS]


                                      15


<PAGE>



     IN WITNESS WHEREOF, the Guarantor has caused this Guaranty to be duly
executed and delivered by its officer thereunto duly authorized as of the date
first above written.



                                      VITRO, S.A. DE C.V.



                                      By:    /s/ Alvaro Rodriguez Arregui
                                             -----------------------------
                                      Name:  Alvaro Rodriguez Arregui
                                      Title: Chief Financial Officer

                                      By:    /s/ Claudio Luis del Valle
                                             -----------------------------
                                      Name:  Claudio Luis del Valle
                                      Title: Chief Administrative Officer


                                      Address for Notices:

                                      Vitro, S.A. de C.V.
                                      Ave. Ricardo Margin
                                      Zozaya 400
                                      Col. Valle del Campestre
                                      San Pedro Garza Garcia, Nuevo Leon
                                      Mexico, 66265

                                      Attention:   Mr. Francisco Romero
                                      Facsimile:   011-52-81-8335 8319
                                      Telephone:   011-52-81-8863 1262






<PAGE>





                                 SCHEDULE 3.9


None.