Document:

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                                                                    EXHIBIT 4.12

                                                               EXECUTION VERSION

                          THIRD SUPPLEMENTAL INDENTURE

                                      among

                            EAGLEPICHER INCORPORATED

                       f/k/a Eagle-Picher Industries Inc.,
                      as successor to E-P Acquisition, Inc.

                                       and

                           THE GUARANTORS PARTY HERETO

                                       and

                              THE BANK OF NEW YORK,
                                   as Trustee

                                   dated as of

                                  July 22, 2003

                           supplementing that certain

                                    INDENTURE

                          dated as of February 24, 1998
              as amended on February 24, 1998 and December 14, 2001

                                    regarding

                                  $220,000,000

               9 3/8% Senior Subordinated Notes due March 1, 2008

                                       of

                              E-P Acquisition, Inc.

<PAGE>

         THIS THIRD SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"),
dated as of July 22, 2003, is among EaglePicher Incorporated, an Ohio
corporation (f/k/a Eagle-Picher Industries, Inc.), as successor to E-P
Acquisitions, Inc. (the "Company"), the Guarantors party hereto and The Bank of
New York, a New York banking corporation, as trustee, (the "Trustee") under the
Indenture (as defined below). Capitalized terms used herein and not defined
herein will have the meaning ascribed to them in the Indenture.

                               W I T N E S S E T H

                  WHEREAS, the Company and the Guarantors have heretofore
executed and delivered to the Trustee an indenture, dated as of February 24,
1998, providing for the issuance of an aggregate amount of $220,000,000 of 9?%
Senior Subordinated Notes due 2008 (the "Notes"), as previously supplemented by
the First Supplemental Indenture dated as of February 24, 1998 and the Second
Supplemental Indenture dated as of December 14, 2001 (together, the
"Indenture");

                  WHEREAS, the Company has made an offer to the Holders of the
Notes to purchase any and all of such Notes for cash upon the terms and subject
to the conditions set forth in the Offer to Purchase and Consent Solicitation
Statement dated July 9, 2003 and the Consent and Letter of Transmittal
(together, the "Offer to Purchase");

                  WHEREAS, pursuant to the terms of the Offer to Purchase,
Holders that tender Notes in accordance with the terms of the Offer to Purchase
are deemed to have consented to certain amendments to the Indenture that would
permanently eliminate or modify certain restrictive covenants, event of default
provisions and other provisions of the Indenture (the "Proposed Amendments"), as
set forth herein;

                  WHEREAS, pursuant to Article 9 of the Indenture, the Trustee
is authorized to execute and deliver this Supplemental Indenture;

                  WHEREAS, the Company having been duly authorized by a Board
Resolution, and the Trustee (i) having received an Opinion of Counsel pursuant
to Sections 9.06, 12.04 and 12.05 of the Indenture stating that the conditions
precedent provided for in the Indenture have been complied with and (ii) having
received an Officers' Certificate of the Company pursuant to Sections 9.06,
12.04 and 12.05 of the Indenture certifying that the conditions precedent
provided for in the Indenture have been complied with, are authorized to execute
and deliver this Supplemental Indenture pursuant to Article 9 of the Indenture;

                  WHEREAS, all of the conditions and requirements necessary to
make this Supplemental Indenture, when duly executed and delivered, a valid and
binding agreement, enforceable in accordance with its terms (subject to becoming
effective as provided in paragraph 3 below), have been performed and fulfilled;

                  NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby acknowledged,
the Company, the

                                       1            THIRD SUPPLEMENTAL INDENTURE

<PAGE>

Guarantors and the Trustee mutually covenant and agree for the equal and ratable
benefit of the Holders of the Notes as follows:

                  1.       CAPITALIZED TERMS. Capitalized terms used herein
without definitions will have the meanings assigned to them in the Indenture.

                  2.       AMENDMENTS TO THE INDENTURE. Subject to Sections 3, 9
and 10 hereof, the Indenture is hereby amended as follows:

                  (i)      All definitions set forth in Section 1.01 of the
                           Indenture and all references throughout the Indenture
                           that relate to defined terms used solely in covenants
                           or sections deleted hereby, including references to
                           section headings, are deleted in their entirety and
                           the following provision is substituted in their
                           place: "Intentionally omitted."

                  (ii)     The Section entitled "Mandatory Offers," set forth in
                           Section 3.08 of the Indenture, is deleted in its
                           entirety and the following provision is substituted
                           in its place: "Intentionally omitted."

                  (iii)    The covenant entitled "Reports," set forth in Section
                           4.02 of the Indenture, is deleted in its entirety and
                           the following provision is substituted in its place:
                           "Intentionally omitted."

                  (iv)     The covenant entitled "Compliance Certificate," set
                           forth in Section 4.03 of the Indenture, is deleted in
                           its entirety and the following provision is
                           substituted in its place: "Intentionally omitted."

                  (v)      The covenant entitled "Stay, Extension and Usury
                           Laws," set forth in Section 4.04 of the Indenture, is
                           deleted in its entirety and the following provision
                           is substituted in its place: "Intentionally omitted."

                  (vi)     The covenant entitled "Limitation on Restricted
                           Payments," set forth in Section 4.05 of the
                           Indenture, is deleted in its entirety and the
                           following provision is substituted in its place:
                           "Intentionally omitted."

                  (vii)    The covenant entitled "Corporate Existence," set
                           forth in Section 4.06 of the Indenture, is deleted in
                           its entirety and the following provision is
                           substituted in its place: "Intentionally omitted."

                  (viii)   The covenant entitled "Limitations on Additional
                           Indebtedness," set forth in Section 4.07 of the
                           Indenture, is deleted in its entirety and the
                           following provision is substituted in its place:
                           "Intentionally omitted."

                  (ix)     The covenant entitled "Limitation on the Issuance of
                           Capital Stock of Restricted Subsidiaries," set forth
                           in Section 4.08 of the Indenture, is

                                       2            THIRD SUPPLEMENTAL INDENTURE

<PAGE>

                           deleted in its entirety and the following provision
                           is substituted in its place: "Intentionally omitted."

                  (x)      The covenant entitled "Limitations on Layering Debt,"
                           set forth in Section 4.09 of the Indenture, is
                           deleted in its entirety and the following provision
                           is substituted in its place: "Intentionally omitted."

                  (xi)     The covenant entitled "Limitation on Transactions
                           with Affiliates," set forth in Section 4.10 of the
                           Indenture, is deleted in its entirety and the
                           following provision is substituted in its place:
                           "Intentionally omitted."

                  (xii)    The covenant entitled "Limitations on Liens," set
                           forth in Section 4.11 of the Indenture, is deleted in
                           its entirety and the following provision is
                           substituted in its place: "Intentionally omitted."

                  (xiii)   The covenant entitled "Taxes," set forth in Section
                           4.12 of the Indenture, is deleted in its entirety and
                           the following provision is substituted in its place:
                           "Intentionally omitted."

                  (xiv)    The covenant entitled "Limitations on Restrictions on
                           Distributions from Restricted Subsidiaries," set
                           forth in Section 4.13 of the Indenture, is deleted in
                           its entirety and the following provision is
                           substituted in its place: "Intentionally omitted."

                  (xv)     The covenant entitled "Change of Control," set forth
                           in Section 4.15 of the Indenture, is deleted in it
                           entirety and the following provision is substituted
                           in its place: "Intentionally omitted."

                  (xvi)    The covenant entitled "Limitations on Asset Sales,"
                           set forth in Section 4.16 of the Indenture, is
                           deleted in its entirety and the following provision
                           is substituted in its place: "Intentionally omitted."

                  (xvii)   The covenant entitled "Additional Note Guarantees,"
                           set forth in Section 4.17 of the Indenture, is
                           deleted in its entirety and the following provision
                           is substituted in its place: "Intentionally omitted."

                  (xviii)  Subsection (a) of the Section entitled "Limitation on
                           Mergers and Certain Other Transactions," set forth in
                           Section 5.01 of the Indenture, is amended and
                           restated in its entirety as follows: "(a) The Company
                           will not, in a single transaction or a series of
                           related transactions, (i) consolidate or merge with
                           or into (other than a merger with a Wholly-Owned
                           Restricted Subsidiary solely for the purpose of
                           changing the Company's jurisdiction of incorporation
                           to another State of the United States), or sell,
                           lease, transfer, convey or otherwise dispose of or
                           assign all or substantially all of the assets of the
                           Company or the Company and its Subsidiaries (taken as
                           a whole), or assign any of its obligations under the
                           Notes and this Indenture, to any

                                       3            THIRD SUPPLEMENTAL INDENTURE

<PAGE>

                           Person or (ii) adopt a Plan of Liquidation unless, in
                           either case: (w) the Person formed by or surviving
                           such consolidation or merger (if other than the
                           Company) or to which such sale, lease, conveyance or
                           other disposition or assignment shall be made (or, in
                           the case of a Plan of Liquidation, any Person to
                           which assets are transferred) (collectively, the
                           "SUCCESSOR"), is a corporation organized and existing
                           under the laws of any State of the United States of
                           America or the District of Columbia, and the
                           Successor assumes by supplemental indenture in a form
                           satisfactory to the Trustee all of the obligations of
                           the Company under the Notes and this Indenture; (x)
                           immediately prior to and immediately after giving
                           effect to such transaction and the assumption of the
                           obligations as set forth in clause (w) above and the
                           incurrence of any Indebtedness to be incurred in
                           connection therewith, no Default or Event of Default
                           shall have occurred and be continuing; and (y) each
                           Subsidiary Guarantor, unless it is the other party to
                           the transactions described above, shall have by
                           amendment to its guarantee confirmed that its
                           guarantee of the Notes shall apply to the obligations
                           of the Company or the Successor under the Notes and
                           this Indenture. For purposes of this covenant, any
                           Indebtedness of the Successor which was not
                           Indebtedness of the Company immediately prior to the
                           transaction shall be deemed to have been incurred in
                           connection with such transaction."

                  (xix)    Subsections (a)(iii) through (a)(vi) of the Section
                           entitled "Events of Default," set forth in Section
                           6.01 of the Indenture, are deleted in their entirety
                           and the following provision is substituted in their
                           place: "Sub-sections (iii)-(vi) intentionally
                           omitted."

                  (xx)     The Section entitled "Senior Subordinated Debt of
                           Guarantor," set forth in Section 11.04 of the
                           Indenture, is deleted in its entirety and the
                           following provision is substituted in its place:
                           "Intentionally omitted."

                  3.       EFFECTIVENESS AND OPERATIVENESS. This Supplemental
Indenture will become effective upon the signing hereof and operative only upon
the acceptance by the Company of, and payment for, Notes that are properly
tendered and not withdrawn pursuant to the Offer to Purchase. If the Notes that
are properly tendered and not withdrawn pursuant to the Offer to Purchase are
not accepted for payment and are not paid, this Supplemental Indenture will not
become operative and will forthwith cease to be effective. The restrictive
covenants and other provisions affected by this Supplemental Indenture will be
revived and reinstated as though this Supplemental Indenture had not been
executed.

                  4.       GOVERNING LAW. This Supplemental Indenture shall be
deemed to be a contract made under the laws of the State of New York and for all
purposes shall be governed by and construed in accordance with the laws of the
State of New York, without regard to the conflict of laws provisions thereof.

                                       4            THIRD SUPPLEMENTAL INDENTURE

<PAGE>

                  5.       COUNTERPARTS. The parties may sign any number of
copies of this Supplemental Indenture. Each signed copy will be an original, but
all of them together represent the same agreement.

                  6.       EFFECT OF HEADINGS. The Section headings herein are
for convenience only and will not affect the construction hereof.

                  7.       DUTIES AND RESPONSIBILITIES OF TRUSTEE. The Trustee
accepts the amendments of the Indenture effected by this Supplemental Indenture
and agrees to execute the trust created by the Indenture as hereby amended, but
only upon the terms and conditions set forth in the Indenture, including the
terms and provisions defining and limiting the liabilities and responsibilities
of the Trustee, which terms and provisions define and limit its liabilities and
responsibilities in the performance of the trust created by the Indenture as
hereby amended, and, without limiting the generality of the foregoing, the
Trustee makes no representation as to (i) the proper authorization hereof by the
Company and the Guarantors by corporate action or otherwise, (ii) the due
execution hereof by the Company and the Guarantors or (iii) the validity,
accuracy or sufficiency of this Supplemental Indenture. The recitals contained
herein shall be taken as the statements of the Company and the Trustee assumes
no responsibility for their correctness.

                  8.       LEGEND. Pursuant to the Indenture, all Notes
authenticated and delivered after the date hereof in exchange for or in lieu of
any Notes theretofore issued will have imprinted or stamped thereon a legend in
substantially the following form:

                  "The Indenture has been amended pursuant to a Third
                  Supplemental Indenture dated as of July 22, 2003, copies of
                  which are available from the Company or the Trustee."

                  9.       CONFLICT OF PROVISIONS. If and to the extent that any
provision of this Supplemental Indenture limits, qualifies or conflicts with
another provision included in this Supplemental Indenture or in the Indenture
that is required to be included in this Supplemental Indenture or the Indenture
by any of the provisions of Sections 310 to 318, inclusive, of the Trust
Indenture Act of 1939, as amended (the "TIA"), such required provision of the
TIA will control.

                  10.      RATIFICATION AND CONFIRMATION OF INDENTURE. Except as
hereby expressly supplemented and amended, the Indenture is in all respects
ratified and confirmed and all the terms, conditions and provisions thereof
shall remain in full force and effect.

                         [Signatures begin on next page]

                                       5           THIRD SUPPLEMENTAL INDENTURE

<PAGE>

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

           EAGLEPICHER INCORPORATED

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

           DAISY PARTS, INC.

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

           EAGLEPICHER DEVELOPMENT COMPANY, INC.

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

           EAGLEPICHER HOLDINGS, INC.

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

           EAGLEPICHER FAR EAST, INC.

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

           EAGLEPICHER FILTRATION & MINERALS, INC.

           By: /s/ Thomas R. Pilholski
              _________________________________________________________
           Name:   Thomas R. Pilholski
                _______________________________________________________
           Title:  Sr. Vice President and CFO
                 ______________________________________________________

                                                    THIRD SUPPLEMENTAL INDENTURE

<PAGE>

           EAGLEPICHER TECHNOLOGIES, INC.

           By:    /s/ Bradley J. Waters
                  ________________________________________________________

           Name:  Bradley J. Waters
                  ________________________________________________________

           Title: Vice President and Chief Financial Officer
                  ________________________________________________________

           HILLSDALE TOOL & MANUFACTURING CO.

           By:    /s/ Thomas R. Pilholski
                  ________________________________________________________

           Name:  Thomas R. Pilholski
                  ________________________________________________________

           Title: Sr. Vice President and CFO
                  ________________________________________________________

           EPMR CORPORATION

           By:    /s/ Thomas R. Pilholski
                  ________________________________________________________

           Name:  Thomas R. Pilholski
                  ________________________________________________________

           Title: Sr. Vice President and CFO
                  ________________________________________________________

           CARPENTER ENTERPRISES LIMITED

           By:    /s/ Thomas R. Pilholski
                  ________________________________________________________

           Name:  Thomas R. Pilholski
                  ________________________________________________________

           Title: Sr. Vice President and CFO
                  ________________________________________________________

           THE BANK OF NEW YORK

           as Trustee

           By:    /s/ Paul J. Schmalzel
                  ________________________________________________________

           Name:  Paul J. Schmalzel
                  ________________________________________________________

           Title: Vice President
                  ________________________________________________________

                                                    THIRD SUPPLEMENTAL INDENTURE<PAGE>

                                                                    EXHIBIT 4.13

[Insert the Global Note Legend, if applicable pursuant to the provisions of the
Indenture]

[Insert the Private Placement Legend, if applicable pursuant to the provisions
of the Indenture]

                                 [FACE OF NOTE]

CUSIP No. [             ]
ISIN No. [             ]

               9 3/4% [Series A] [Series B] Senior Notes due 2013
No. ___                                                      $____________
                            EAGLEPICHER INCORPORATED

promises to pay to ____________________________________________________________
or registered assigns,

the principal sum of __________________________________________________________
Dollars on September 1, 2013.

Interest Payment Dates:  March 1 and September 1

Record Dates:  February 15 and August 15

                             EAGLEPICHER INCORPORATED

                             By: _____________________________________________
                                Name:
                                Title:

This is one of the Notes referred to
in the within-mentioned Indenture:

Dated:  _____________, ____

Wells Fargo Bank, National Association, as Trustee

By:    __________________________________
       Authorized Signatory

                                     A-1-1

<PAGE>

                                 [BACK OF NOTE]

                  9 3/4% [SERIES A] [SERIES B] SENIOR NOTES DUE 2013

         Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

         Interest. EaglePicher Incorporated, an Ohio corporation (the
"Company"), promises to pay interest on the principal amount of this Note at 9
3/4% per annum from August 7, 2003 until maturity and shall pay the Additional
Interest payable pursuant to Section 4 of the Registration Rights Agreement
referred to below. The Company will pay interest and Additional Interest
semi-annually in arrears on March 1 and September 1 of each year, or if any such
day is not a Business Day, on the next succeeding Business Day (each, an
"Interest Payment Date"). Interest on the Notes will accrue from the most recent
date to which interest has been paid or, if no interest has been paid, from the
date of issuance; provided that if there is no existing Default in the payment
of interest, and if this Note is authenticated between a record date referred to
on the face hereof and the next succeeding Interest Payment Date, interest shall
accrue from such next succeeding Interest Payment Date; provided, further, that
the first Interest Payment Date shall be March 1, 2004. The Company shall pay
interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue principal and premium, if any, from time to time on
demand at a rate that is 1% per annum in excess of the rate then in effect; it
shall pay interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue installments of interest and Additional Interest
(without regard to any applicable grace periods) from time to time on demand at
the same rate to the extent lawful. Interest will be computed on the basis of a
360-day year of twelve 30-day months.

         METHOD OF PAYMENT. The Company will pay interest on the Notes (except
defaulted interest) and Additional Interest to the Persons who are registered
Holders of Notes at the close of business on the February 15 or August 15 next
preceding the Interest Payment Date, even if such Notes are canceled after such
record date and on or before such Interest Payment Date, except as provided in
Section 2.12 of the Indenture with respect to defaulted interest. The Notes will
be payable as to principal, premium and Additional Interest, if any, and
interest at the office or agency of the Company maintained for such purpose
within or without the City and State of New York, or, at the option of the
Company, payment of interest and Additional Interest may be made by check mailed
to the Holders at their addresses set forth in the register of Holders, and
provided that payment by wire transfer of immediately available funds will be
required with respect to principal of and interest, premium and Additional
Interest on, all Global Notes and all other Notes the Holders of which shall
have provided wire transfer instructions to the Company or the Paying Agent at
least ten Business Days prior to the applicable payment date. Such payment shall
be in such coin or currency of the United States of America as at the time of
payment is legal tender for payment of public and private debts.

         AGENT AND REGISTRAR. Initially, Wells Fargo Bank, National Association,
the Trustee under the Indenture, will act as Paying Agent and Registrar. The
Company may change any Paying Agent or Registrar without notice to any Holder.
The Company or any of its Subsidiaries may act in any such capacity.

         INDENTURE. The Company issued the Notes under an Indenture dated as of
August 7, 2003 ("Indenture") between the Company, the Guarantors listed on the
signature page therein (the "Guarantors") and the Trustee. The terms of the
Notes include those stated in the Indenture and those made part

                                     A-1-2

<PAGE>

of the Indenture by reference to the Trust Indenture Act of 1939, as amended (15
U.S. Code Sections 77aaa-77bbbb). The Notes are subject to all such terms, and
Holders are referred to the Indenture and such Act for a statement of such
terms. To the extent any provision of this Note conflicts with the express
provisions of the Indenture, the provisions of the Indenture shall govern and be
controlling. The Initial Notes are obligations of the Company limited to $250.0
million in aggregate principal amount.

         OPTIONAL REDEMPTION.

         (a)      Except as set forth in clause (b) below, the Company shall not
have the option to redeem the Notes pursuant to this paragraph prior to
September 1, 2008. Thereafter, the Company shall have the option to redeem the
Notes, in whole or in part, at the redemption prices (expressed as percentages
of principal amount) set forth below plus accrued and unpaid interest and
Additional Interest thereon, if any, to the applicable redemption date, if
redeemed during the 12-month period beginning on September 1 of the years
indicated below:

<TABLE>
<CAPTION>
Year                                             Percentage
----                                             ----------
<S>                                              <C>
2008........................................     104.875%
2009........................................     103.250%
2010........................................     101.625%
2011 and thereafter.........................     100.000%
</TABLE>

         (b)      Notwithstanding the provisions of clause (a) above, at any
time on or prior to September 1, 2006, the Company may on one or more occasions
redeem up to an aggregate of 35% of the principal amount of Notes issued under
the Indenture at a redemption price equal to 109.75% of the principal amount
thereof plus accrued and unpaid interest and Additional Interest thereon, if
any, to the redemption date with the net cash proceeds of one or more Equity
Offerings of the Company to the extent the net cash proceeds thereof are
contributed to the Company as a capital contribution to the common equity of the
Company; provided, however, that at least 65% of the aggregate principal amount
of the Notes remains outstanding immediately after the occurrence of such
redemption and that such redemption occurs within 90 days of the date of the
closing of such Equity Offering.

         MANDATORY REDEMPTION.

         The Company shall not be required to make mandatory redemption or
sinking fund payments with respect to the Notes.

         REPURCHASE AT OPTION OF HOLDER. Upon the occurrence of a Change of
Control, the Company shall be required to make an offer (a "Change of Control
Offer") to each Holder to repurchase all or any part (equal to $1,000 or an
integral multiple thereof) of each Holder's Notes at a purchase price equal to
101% of the aggregate principal amount thereof plus accrued and unpaid interest
and Additional Interest thereon, if any, to the date of purchase (the "Change of
Control Payment"). Within 30 days following any Change of Control, the Company
shall mail a notice to each Holder setting forth the procedures governing the
Change of Control Offer as required by the Indenture.

         NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30
days but not more than 60 days before the redemption date to each Holder whose
Notes are to be redeemed at its registered address. Notes in denominations
larger than $1,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed. On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

                                     A-1-3

<PAGE>

         DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples of $1,000. The
transfer of Notes may be registered and Notes may be exchanged as provided in
the Indenture. The Registrar and the Trustee may require a Holder, among other
things, to furnish appropriate endorsements and transfer documents and the
Company may require a Holder to pay any taxes and fees required by law or
permitted by the Indenture. The Company need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being redeemed in part. Also, the Company
need not exchange or register the transfer of any Notes for a period of 15 days
before a selection of Notes to be redeemed or during the period between a record
date and the succeeding Interest Payment Date.

         PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated
as its owner for all purposes.

         AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the
Indenture, the Note Guarantees or the Notes may be amended or supplemented with
the consent of the Holders of at least a majority in principal amount of the
then outstanding Notes and Additional Notes, if any, voting as a single class,
and any existing default or compliance with any provision of the Indenture, the
Note Guarantees or the Notes may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes and Additional Notes,
if any, voting as a single class. Without the consent of any Holder of a Note,
the Indenture, the Note Guarantees or the Notes may be amended or supplemented
to cure any ambiguity, defect or inconsistency; to provide for uncertificated
Notes in addition to or in place of certificated Notes or to alter the
provisions of Article II of the Indenture (including the related definitions) in
a manner that does not materially adversely affect any Holder; to provide for
the assumption of the Company's obligations to the Holders of the Notes in the
case of a merger or acquisition by a successor to the Company pursuant to
Article V of the Indenture; to release any Guarantor from any of its obligations
under its Note Guarantee or the Indenture (to the extent permitted by the
Indenture); to make any change that would that does not materially adversely
affect the legal rights hereunder of any Holder of the Notes; or to comply with
requirements of the SEC in order to effect or maintain the qualification of this
Agreement under the Trust Indenture Act.

         DEFAULTS AND REMEDIES. Events of Default include: (i) default for 30
days in the payment when due of interest or Additional Interest, if any, on the
Notes; (ii) default in payment when due of principal of or premium, if any, on
the Notes when the same becomes due and payable at maturity, upon redemption,
upon purchase, upon acceleration or otherwise; (iii) failure by the Company to
comply with any of its agreements or covenants described under Section 4.15 or
5.01 of the Indenture; (iv) failure by the Company for 60 days after notice to
the Company by the Trustee or the Holders of at least 25% in aggregate principal
amount of the Notes (including Additional Notes, if any) then outstanding voting
as a single class to comply with certain other agreements in the Indenture; (v)
default under certain other agreements relating to an aggregate amount of
Indebtedness of the Company equal to or exceeding $10.0 million which default
results in, among other things, the acceleration of such Indebtedness prior to
its express maturity; (vi) certain final judgments for the payment of money in
excess of $10.0 million in the aggregate that remain undischarged for a period
of 60 days; (vii) certain events of bankruptcy or insolvency with respect to the
Company or any of its Significant Subsidiaries; and (viii) except as permitted
by the Indenture, any Note Guarantee of a Significant Subsidiary ceases to be in
full force and effect or is declared null and void and unenforceable or is found
to be invalid or any Guarantor denies its liability under such Note Guarantee.
If any Event of Default occurs and is continuing, the Trustee or the Holders of
at least 25% in principal amount of the then outstanding Notes may declare all
the Notes to be due and payable. Notwithstanding the foregoing, in the case of
an Event of Default arising from certain events of bankruptcy or insolvency, all
outstanding Notes will become due and payable without further action or

                                     A-1-4

<PAGE>

notice. Holders may not enforce the Indenture or the Notes except as provided in
the Indenture. Subject to certain limitations, Holders of a majority in
principal amount of the then outstanding Notes may direct the Trustee in its
exercise of any trust or power. The Trustee may withhold from Holders of the
Notes notice of any continuing Default (except a Default relating to the payment
of principal or interest) if it determines that withholding notice is in their
interest. The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may on behalf of the Holders of all of
the Notes waive any existing Default and its consequences under the Indenture
except a continuing Default in the payment of interest on, premium and
Additional Interest, if any, or the principal of, the Notes. The Company is
required to deliver to the Trustee annually a statement regarding compliance
with the Indenture, and the Company is required upon becoming aware of any
Default, to deliver to the Trustee a statement specifying such Default.

         TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or any
other capacity, may make loans to, accept deposits from, and perform services
for the Company or its Affiliates, and may otherwise deal with the Company or
its Affiliates, as if it were not the Trustee.

         NO RECOURSE AGAINST OTHERS. A director, officer, employee, incorporator
or stockholder of the Company or any Guarantor, as such, shall not have any
liability for any obligations of the Company or any Guarantor under the Notes,
the Note Guarantees or the Indenture or for any claim based on, in respect of,
or by reason of, such obligations or their creation. Each Holder by accepting a
Note waives and releases all such liability. The waiver and release are part of
the consideration for the issuance of the Notes and the Guarantees.

         AUTHENTICATION. This Note shall not be valid until authenticated by the
manual signature of the Trustee or an authenticating agent.

         ABBREVIATIONS. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

         ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES AND RESTRICTED
DEFINITIVE NOTES. In addition to the rights provided to Holders of Notes under
the Indenture, Holders of Restricted Global Notes and Restricted Definitive
Notes shall have all the rights set forth in the Registration Rights Agreement
dated as of August 7, 2003, between the Company and the parties named on the
signature pages thereof (the "Registration Rights Agreement").

         CUSIP NUMBERS. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders. No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

                                     A-1-5

<PAGE>

         The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

                  EaglePicher Incorporated
                  11201 North Tatum Boulevard
                  Suite 110
                  Phoenix, Arizona  85028
                  Attention:  David Krall, Esq.

                                     A-1-6

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