1 EXHIBIT 4-AA PREFERRED SECURITIES GUARANTEE AGREEMENT HERCULES INCORPORATED Dated as of December 23, 1999 2 TABLE OF CONTENTS PAGE ---- ARTICLE 1 DEFINITIONS AND INTERPRETATION SECTION 1.01. Definitions and Interpretation.................................................. 2 ARTICLE 2 TRUST INDENTURE ACT SECTION 2.01. Trust Indenture Act; Application................................................ 6 SECTION 2.02. List of Holders of Securities................................................... 6 SECTION 2.03. Reports by the Preferred Securities Guarantee Trustee........................... 6 SECTION 2.04. Periodic Reports to Preferred Securities Guarantee Trustee.................................................................. 7 SECTION 2.05. Evidence of Compliance with Conditions Precedent................................ 7 SECTION 2.06. Events of Default; Waiver....................................................... 7 SECTION 2.07. Event of Default; Notice........................................................ 7 SECTION 2.08. Conflicting Interests........................................................... 8 ARTICLE 3 POWERS, DUTIES AND RIGHTS OF PREFERRED SECURITIES GUARANTEE TRUSTEE SECTION 3.01. Powers and Duties of the Preferred Securities Guarantee Trustee.................................................................. 8 SECTION 3.02. Certain Rights of Preferred Securities Guarantee Trustee........................ 10 SECTION 3.03. Not Responsible for Recitals or Issuance of Preferred Securities Guarantee...................................................... 13 ARTICLE 4 PREFERRED SECURITIES GUARANTEE TRUSTEE SECTION 4.01. Preferred Securities Guarantee Trustee; Eligibility............................. 13 SECTION 4.02. Appointment, Removal and Resignation of Preferred Securities Guarantee Trustee............................................. 14 ARTICLE 5 GUARANTEE SECTION 5.01. Guarantee....................................................................... 15 SECTION 5.02. Waiver of Notice and Demand..................................................... 15 SECTION 5.03. Obligations Not Affected........................................................ 15 3 PAGE ---- SECTION 5.04. Rights of Holders............................................................... 16 SECTION 5.05. Guarantee of Payment............................................................ 16 SECTION 5.06. Subrogation..................................................................... 16 SECTION 5.07. Independent Obligations......................................................... 17 ARTICLE 6 LIMITATION OF TRANSACTIONS; SUBORDINATION SECTION 6.01. Limitation of Transactions...................................................... 17 SECTION 6.02. Ranking......................................................................... 18 ARTICLE 7 TERMINATION SECTION 7.01. Termination..................................................................... 18 ARTICLE 8 EXCULPATION, INDEMNIFICATION AND COMPENSATION SECTION 8.01. Exculpation..................................................................... 18 SECTION 8.02. Indemnification................................................................. 19 SECTION 8.03. Compensation.................................................................... 19 ARTICLE 9 MISCELLANEOUS SECTION 9.01. Successors and Assigns.......................................................... 20 SECTION 9.02. Amendments...................................................................... 20 SECTION 9.03. Notices......................................................................... 20 SECTION 9.04. Benefit......................................................................... 22 SECTION 9.05. Governing Law................................................................... 22 ii 4 PREFERRED SECURITIES GUARANTEE AGREEMENT THIS PREFERRED SECURITIES GUARANTEE AGREEMENT (the "PREFERRED SECURITIES GUARANTEE"), dated as of December 23, 1999 is executed and delivered by Hercules Incorporated, a Delaware corporation (the "GUARANTOR"), and The Chase Manhattan Bank, a New York banking corporation, as trustee (the "PREFERRED SECURITIES GUARANTEE TRUSTEE"), for the benefit of the Holders (as defined herein) from time to time of the Preferred Securities (as defined herein) of Hercules Trust VI, a statutory business trust formed under the laws of the State of Delaware (the "ISSUER"). WHEREAS, pursuant to an Amended and Restated Trust Agreement (the "TRUST AGREEMENT"), dated as of December 23, 1999, among the Trustees of the Issuer, the Guarantor, as Sponsor, and the holders from time to time of undivided beneficial interests in the assets of the Issuer, the Issuer is issuing on the date hereof 170,000 Floating Rate Preferred Securities, having an aggregate Liquidation Amount of $170,000,000 (collectively, the "PREFERRED SECURITIES"). WHEREAS, as an incentive for the Holders to purchase the Preferred Securities, the Guarantor desires irrevocably and unconditionally to agree, to the extent set forth in this Preferred Securities Guarantee, to pay to the Holders of the Preferred Securities the Guarantee Payments (as defined herein) and to make certain other payments on the terms and conditions set forth herein. WHEREAS, the Guarantor is also executing and delivering a guarantee agreement (the "COMMON SECURITIES GUARANTEE") with substantially identical terms to this Preferred Securities Guarantee, for the benefit of the holders of the Common Securities (as defined herein), except that if an event of default under the Trust Agreement has occurred and is continuing, the rights of holders of the Common Securities to receive Guarantee Payments under the Common Securities Guarantee are subordinated, to the extent and in the manner set forth in the Common Securities Guarantee, to the rights of holders of Preferred Securities to receive Guarantee Payments under, and as defined in, this Preferred Securities Guarantee. NOW, THEREFORE, in consideration of the purchase by each Holder of Preferred Securities, which purchase the Guarantor hereby acknowledges shall benefit the Guarantor, the Guarantor executes and delivers this Preferred Securities Guarantee for the benefit of the Holders. 5 ARTICLE 1 DEFINITIONS AND INTERPRETATION SECTION 1.01. Definitions and Interpretation. In this Preferred Securities Guarantee, unless the context otherwise requires: (a) capitalized terms used in this Preferred Securities Guarantee but not defined in the preamble above have the respective meanings assigned to them in this Section 1.01; (b) terms defined in the Trust Agreement as at the date of execution of this Preferred Securities Guarantee have the same meaning when used in this Preferred Securities Guarantee unless otherwise defined in this Preferred Securities Guarantee; (c) a term defined anywhere in this Preferred Securities Guarantee has the same meaning throughout; (d) all references to "THE PREFERRED SECURITIES GUARANTEE" or "THIS PREFERRED SECURITIES GUARANTEE" are to this Preferred Securities Guarantee as modified, supplemented or amended from time to time; (e) all references in this Preferred Securities Guarantee to Articles and Sections are to Articles and Sections of this Preferred Securities Guarantee, unless otherwise specified; (f) a term defined in the Trust Indenture Act has the same meaning when used in this Preferred Securities Guarantee, unless otherwise defined in this Preferred Securities Guarantee or unless the context otherwise requires; and (g) a reference to the singular includes the plural and vice versa. "AFFILIATE" has the same meaning as given to that term in Rule 405 under the Securities Act of 1933, as amended, or any successor rule thereunder. "BUSINESS DAY" means any day other than a Saturday or a Sunday, or a day on which banking institutions in The City of New York or Wilmington, Delaware are authorized or required by law, regulation or executive order to close and that is also a London Banking Day. "COMMON SECURITIES" means the securities representing common undivided beneficial interests in the assets of the Issuer. 2 6 "CORPORATE TRUST OFFICE" means the office of the Preferred Securities Guarantee Trustee for the conduct of corporate trust business at which matters related to this Preferred Securities Guarantee shall, at any particular time, be principally administered, which office at the date of execution of this Preferred Securities Guarantee is located at One Liberty Place, 52nd Floor, 1650 Market Street, Philadelphia, PA 19103. "COVERED PERSON" means any Holder or beneficial owner of Preferred Securities. "DEBENTURES" means the series of junior subordinated debt securities of the Guarantor designated Floating Rate Junior Subordinated Deferrable Interest Debentures due 2000, held by the Property Trustee (as defined in the Trust Agreement) of the Issuer. "EVENT OF DEFAULT" means a default by the Guarantor in respect of any of its payment or other obligations under this Preferred Securities Guarantee. "GUARANTEE PAYMENTS" means the following payments or distributions, without duplication, with respect to the Preferred Securities, to the extent not paid or made by the Issuer: (i) any accumulated and unpaid Distributions (as defined in the Trust Agreement) required to be paid on such Preferred Securities, to the extent the Issuer has funds legally available therefor at such time, (ii) the applicable redemption price with respect to Preferred Securities called for redemption, to the extent that the Issuer has funds legally available therefor at such time, and (iii) upon a voluntary or involuntary dissolution and liquidation of the Issuer (other than in connection with the distribution of the Debentures to Holders of the Common Securities and the Preferred Securities or the redemption or exchange of such Preferred Securities, the lesser of (a) the amounts due upon the dissolution and liquidation of the Issuer, to the extent that the Issuer has funds legally available therefor at the time and (b) the amount of assets of the Issuer remaining available for distribution to Holders of its Preferred Securities after satisfaction of liabilities to creditors of the Issuer as required by applicable law. If an event of default under the Trust Agreement has occurred and is continuing, no Guarantee Payments under the Common Securities Guarantee with respect to the Common Securities or any guarantee payment under any Other Common Securities Guarantees shall be made until the Holders of Preferred Securities shall be paid in full the Guarantee Payments to which they are entitled under this Preferred Securities Guarantee. "HOLDER" shall mean any holder, as registered on the books and records of the Issuer, of any Preferred Securities; provided, however, that, in determining whether the holders of the requisite percentage of Preferred Securities have given 3 7 any request, notice, consent or waiver hereunder, "HOLDER" shall not include the Guarantor or any Affiliate of the Guarantor. "INDEMNIFIED PERSON" means the Preferred Securities Guarantee Trustee, any Affiliate of the Preferred Securities Guarantee Trustee, or any officers, directors, shareholders, members, partners, employees, representatives, nominees, custodians or agents of the Preferred Securities Guarantee Trustee. "INDENTURE" means the Junior Subordinated Debentures Indenture dated as of November 12, 1998, between the Hercules Incorporated, as Issuer (the "DEBENTURE ISSUER"), and The Chase Manhattan Bank, as Trustee, as supplemented by the Fourth Supplemental Indenture dated as of December 23, 1999, pursuant to which the Debentures are to be issued to the Property Trustee of the Issuer. "LIQUIDATION AMOUNT" means $1,000 per Preferred Security. "LIST OF HOLDERS" has the meaning set forth in Section 2.02. "LONDON BANKING DAY" means any day other than a Saturday or Sunday, on which banks are open for business in London. "MAJORITY IN LIQUIDATION AMOUNT OF THE PREFERRED SECURITIES" means, except as provided by the Trust Indenture Act, a vote by Holder(s) of Preferred Securities, voting separately as a class, of more than 50% of the aggregate Liquidation Amount (including the amount payable on redemption, liquidation or otherwise, plus accumulated and unpaid Distributions to the date upon which the voting percentages are determined) of all Preferred Securities. "OFFICERS' CERTIFICATE" means, with respect to any person, a certificate signed by the Chief Executive Officer, the President, a Vice President or the Chief Financial Officer and by the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary of the Guarantor. Any Officers' Certificate delivered with respect to compliance with a condition or covenant provided for in this Preferred Securities Guarantee shall include: (a) a statement that each officer signing the Officers' Certificate has read the covenant or condition and the definitions relating thereto; (b) a brief statement of the nature and scope of the examination or investigation undertaken by each officer in rendering the Officers' Certificate; 4 8 (c) a statement that each such officer has made such examination or investigation as, in such officer's opinion, is necessary to enable such officer to express an informed opinion as to whether or not such covenant or condition has been complied with; and (d) a statement as to whether, in the opinion of each such officer, such condition or covenant has been complied with. "OTHER COMMON SECURITIES GUARANTEES" shall have the same meaning as "OTHER GUARANTEES" in the Common Securities Guarantee. "OTHER DEBENTURES" means all junior subordinated debentures issued by the Guarantor from time to time and sold to trusts established by the Guarantor, in each case similar to the Issuer. "OTHER GUARANTEES" means all guarantees issued by the Guarantor with respect to preferred securities similar to the Preferred Securities issued by other trusts established by the Guarantor, in each case similar to the Issuer. "PERSON" means a legal person, including any individual, corporation, estate, partnership, joint venture, association, joint stock company, limited liability company, trust, unincorporated association, or government or any agency or political subdivision thereof, or any other entity of whatever nature. "PREFERRED SECURITIES GUARANTEE TRUSTEE" means The Chase Manhattan Bank, a New York banking corporation, until a Successor Preferred Securities Guarantee Trustee has been appointed and has accepted such appointment pursuant to the terms of this Preferred Securities Guarantee and thereafter means each such Successor Preferred Securities Guarantee Trustee. "RESPONSIBLE OFFICER" means, with respect to the Preferred Securities Guarantee Trustee, any officer within the Corporate Trust Office of the Preferred Securities Guarantee Trustee, including any vice president, any assistant vice president, any assistant secretary, the treasurer, any assistant treasurer or other officer of the Corporate Trust Office of the Preferred Securities Guarantee Trustee customarily performing functions similar to those performed by any of the above designated officers and also means, with respect to a particular corporate trust matter, any other officer of the Preferred Securities Guarantee Trustee to whom such matter is referred because of that officer's knowledge of and familiarity with the particular subject. "SUCCESSOR PREFERRED SECURITIES GUARANTEE TRUSTEE" means a successor Preferred Securities Guarantee Trustee possessing the qualifications to act as Preferred Securities Guarantee Trustee under Section 4.01. 5 9 "TRUST INDENTURE ACT" means the Trust Indenture Act of 1939, as amended. "TRUST SECURITIES" means, collectively, the Common Securities and the Preferred Securities. ARTICLE 2 TRUST INDENTURE ACT SECTION 2.01. Trust Indenture Act; Application. (a) This Preferred Securities Guarantee is subject to the provisions of the Trust Indenture Act that are required to be part of this Preferred Securities Guarantee and shall, to the extent applicable, be governed by such provisions. (b) If and to the extent that any provision of this Preferred Securities Guarantee limits, qualifies or conflicts with the duties imposed by Sections 310 to 317, inclusive, of the Trust Indenture Act, such imposed duties shall control. SECTION 2.02. Lists of Holders of Securities. (a) The Guarantor shall provide the Preferred Securities Guarantee Trustee (unless the Preferred Securities Guarantee Trustee is otherwise the registrar of the Preferred Securities) with a list, in such form as the Preferred Securities Guarantee Trustee may reasonably require, of the names and addresses of the Holders of the Preferred Securities ("LIST OF HOLDERS"), (i) within 14 days after each record date for payment of Distributions, as of such record date and (ii) at any other time within 30 days of receipt by the Guarantor of a written request for a List of Holders as of a date no more than 14 days before such List of Holders is given to the Preferred Securities Guarantee Trustee, provided that the Guarantor shall not be obligated to provide such List of Holders at any time the List of Holders does not differ from the most recent List of Holders given to the Preferred Securities Guarantee Trustee by the Guarantor. The Preferred Securities Guarantee Trustee may destroy any List of Holders previously given to it on receipt of a new List of Holders. (b) The Preferred Securities Guarantee Trustee shall comply with the obligations set forth under Sections 311(a), 311(b) and 312(b) of the Trust Indenture Act. SECTION 2.03. Reports by the Preferred Securities Guarantee Trustee. Within 60 days after September 1 of each year, commencing September 1, 2000, the Preferred Securities Guarantee Trustee shall provide to the Holders of the Preferred Securities such reports as are specified by Section 313 of the Trust Indenture Act, if any, in the form and in the manner provided by Section 313 of 6 10 the Trust Indenture Act. The Preferred Securities Guarantee Trustee shall also comply with the requirements of Section 313(d) of the Trust Indenture Act. SECTION 2.04. Periodic Reports to Preferred Securities Guarantee Trustee. The Guarantor shall provide to the Preferred Securities Guarantee Trustee such documents, reports and information as required by Section 314 of the Trust Indenture Act (if any) and the compliance certificate required by Section 314 of the Trust Indenture Act in the form, in the manner and at the times required by Section 314 of the Trust Indenture Act. Delivery of such reports, information and documents to the Preferred Securities Guarantee Trustee is for informational purposes only and the Preferred Securities Guarantee Trustee's receipt of such shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Guarantor's compliance with any of its covenants hereunder (as to which the Preferred Securities Guarantee Trustee is entitled to rely exclusively on Officers' Certificates). SECTION 2.05. Evidence of Compliance with Conditions Precedent. The Guarantor shall provide to the Preferred Securities Guarantee Trustee such evidence of compliance with any conditions precedent, if any, provided for in this Preferred Securities Guarantee that relate to any of the matters set forth in Section 314(c) of the Trust Indenture Act. Any certificate or opinion required to be given by an officer pursuant to Section 314(c)(1) may be given in the form of an Officers' Certificate. SECTION 2.06. Events of Default; Waiver. The Holders of a Majority in Liquidation Amount of Preferred Securities may, by vote, on behalf of the Holders of all of the Preferred Securities, waive any past Event of Default and its consequences. Upon such waiver, any such Event of Default shall cease to exist, and any Event of Default arising therefrom shall be deemed to have been cured, for every purpose of this Preferred Securities Guarantee, but no such waiver shall extend to any subsequent or other default or Event of Default or impair any right consequent thereon. SECTION 2.07. Event of Default; Notice. (a) The Preferred Securities Guarantee Trustee shall, within 90 days after the occurrence of a default with respect to this Preferred Securities Guarantee, mail by first class postage prepaid, to all Holders of the Preferred Securities, notices of all defaults actually known to a Responsible Officer of the Preferred Securities Guarantee Trustee, unless such defaults have been cured before the giving of such notice, provided, that, except in the case of default in the payment of any Guarantee Payment, the Preferred Securities Guarantee Trustee shall be protected in withholding such notice if and so long as the board of directors, the executive committee, or a trust committee of directors and/or Responsible Officers of the Preferred Securities Guarantee 7 11 Trustee in good faith determines that the withholding of such notice is in the interests of the Holders of the Preferred Securities. (b) The Preferred Securities Guarantee Trustee shall not be deemed to have knowledge of any Event of Default unless the Preferred Securities Guarantee Trustee shall have received written notice, or a Responsible Officer of the Preferred Securities Guarantee Trustee shall have obtained actual knowledge, of such Event of Default. SECTION 2.08. Conflicting Interests. The Indenture shall be deemed to be specifically described in this Preferred Securities Guarantee for the purposes of clause (i) of the first proviso contained in Section 310(b) of the Trust Indenture Act. ARTICLE 3 POWERS, DUTIES AND RIGHTS OF PREFERRED SECURITIES GUARANTEE TRUSTEE SECTION 3.01. Powers and Duties of the Preferred Securities Guarantee Trustee. (a) This Preferred Securities Guarantee shall be held by the Preferred Securities Guarantee Trustee for the benefit of the Holders of the Preferred Securities, and the Preferred Securities Guarantee Trustee shall not transfer this Preferred Securities Guarantee to any Person except a Holder of Preferred Securities exercising his or her rights pursuant to Section 5.04(b) or to a Successor Preferred Securities Guarantee Trustee on acceptance by such Successor Preferred Securities Guarantee Trustee of its appointment to act as Successor Preferred Securities Guarantee Trustee. The right, title and interest of the Preferred Securities Guarantee Trustee shall automatically vest in any Successor Preferred Securities Guarantee Trustee, and such vesting and succession of title shall be effective whether or not conveyancing documents have been executed and delivered pursuant to the appointment of such Successor Preferred Securities Guarantee Trustee. (b) If an Event of Default actually known to a Responsible Officer of the Preferred Securities Guarantee Trustee has occurred and is continuing, the Preferred Securities Guarantee Trustee shall enforce this Preferred Securities Guarantee for the benefit of the Holders of the Preferred Securities. In such event, any moneys collected shall first be paid to the Preferred Securities Guarantee Trustee for amounts due under Section 8.03 and then to the Holders of the Preferred Securities. (c) The Preferred Securities Guarantee Trustee, before the occurrence of any Event of Default and after the curing of all Events of Default that may have 8 12 occurred, shall undertake to perform only such duties as are specifically set forth in this Preferred Securities Guarantee, and no implied covenants shall be read into this Preferred Securities Guarantee against the Preferred Securities Guarantee Trustee. In case an Event of Default has occurred (that has not been cured or waived pursuant to Section 2.06) and is actually known to a Responsible Officer of the Preferred Securities Guarantee Trustee, the Preferred Securities Guarantee Trustee shall exercise such of the rights and powers vested in it by this Preferred Securities Guarantee, and use the same degree of care and skill in its exercise thereof, as a prudent person would exercise or use under the circumstances in the conduct of his or her own affairs. (d) No provision of this Preferred Securities Guarantee shall be construed to relieve the Preferred Securities Guarantee Trustee from liability for its own negligent action, its own negligent failure to act, its own bad faith or its own willful misconduct, except that: (i) prior to the occurrence of any Event of Default and after the curing or waiving of all such Events of Default that may have occurred: (A) the duties and obligations of the Preferred Securities Guarantee Trustee shall be determined solely by the express provisions of this Preferred Securities Guarantee, and the Preferred Securities Guarantee Trustee shall not be liable except for the performance of such duties and obligations as are specifically set forth in this Preferred Securities Guarantee, and no implied covenants or obligations shall be read into this Preferred Securities Guarantee against the Preferred Securities Guarantee Trustee; and (B) in the absence of bad faith on the part of the Preferred Securities Guarantee Trustee, the Preferred Securities Guarantee Trustee may conclusively rely, as to the truth of the statements and the correctness of the opinions expressed therein, upon any certificates or opinions furnished to the Preferred Securities Guarantee Trustee and conforming to the requirements of this Preferred Securities Guarantee; provided, however, that in the case of any such certificates or opinions that by any provision hereof are specifically required to be furnished to the Preferred Securities Guarantee Trustee, the Preferred Securities Guarantee Trustee shall be under a duty to examine the same to determine whether or not they conform to the requirements of this Preferred Securities Guarantee (but shall not be required to confirm or investigate the accuracy of mathematical calculations or other facts stated therein); 9 13 (ii) the Preferred Securities Guarantee Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer of the Preferred Securities Guarantee Trustee, unless it shall be proved that the Preferred Securities Guarantee Trustee was negligent in ascertaining the pertinent facts upon which such judgment was made; (iii) the Preferred Securities Guarantee Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the direction of the Holders of a Majority in Liquidation Amount of the Preferred Securities relating to the time, method and place of conducting any proceeding for any remedy available to the Preferred Securities Guarantee Trustee, or exercising any trust or power conferred upon the Preferred Securities Guarantee Trustee under this Preferred Securities Guarantee; and (iv) no provision of this Preferred Securities Guarantee shall require the Preferred Securities Guarantee Trustee to expend or risk its own funds or otherwise incur personal financial liability in the performance of any of its duties or in the exercise of any of its rights or powers, if the Preferred Securities Guarantee Trustee shall have reasonable grounds for believing that the repayment of such funds or liability is not reasonably assured to it under the terms of this Preferred Securities Guarantee or indemnity reasonably satisfactory to the Preferred Securities Guarantee Trustee against such risk or liability is not reasonably assured to it. SECTION 3.02. Certain Rights of Preferred Securities Guarantee Trustee. (a) Subject to the provisions of Section 3.01: (i) The Preferred Securities Guarantee Trustee may conclusively rely and shall be fully protected in acting or refraining from acting upon any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document believed by it to be genuine and to have been signed, sent or presented by the proper party or parties. (ii) Any direction or act of the Guarantor contemplated by this Preferred Securities Guarantee may be sufficiently evidenced by an Officers' Certificate. (iii) Whenever, in the administration of this Preferred Securities Guarantee, the Preferred Securities Guarantee Trustee shall deem it desirable that a matter be proved or established before taking, suffering or 10 14 omitting any action hereunder, the Preferred Securities Guarantee Trustee (unless other evidence is herein specifically prescribed) may, in the absence of bad faith on its part, request and conclusively rely upon an Officers' Certificate which, upon receipt of such request, shall be promptly delivered by the Guarantor. (iv) The Preferred Securities Guarantee Trustee shall have no duty to see to any recording, filing or registration of any instrument (including any financing or any continuation statement or any filing under tax or securities laws) or any re-recording, refiling or registration thereof. (v) The Preferred Securities Guarantee Trustee may consult with counsel or other experts of its selection, and the advice or opinion of such counsel and experts with respect to legal matters or advice within the scope of such experts' area of expertise shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in accordance with such advice or opinion. Such counsel may be counsel to the Guarantor or any of its Affiliates and may include any of its employees. The Preferred Securities Guarantee Trustee shall have the right at any time to seek instructions concerning the administration of this Preferred Securities Guarantee from any court of competent jurisdiction. (vi) The Preferred Securities Guarantee Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Preferred Securities Guarantee at the request or direction of any Holder, unless such Holder shall have provided to the Preferred Securities Guarantee Trustee such security and indemnity, reasonably satisfactory to the Preferred Securities Guarantee Trustee, against the costs, expenses (including reasonable attorneys' fees and expenses and the expenses of the Preferred Securities Guarantee Trustee's agents, nominees or custodians) and liabilities that might be incurred by it in complying with such request or direction, including such reasonable advances as may be requested by the Preferred Securities Guarantee Trustee, provided, that nothing contained in this Section 3.02(a)(vi) shall be taken to relieve the Preferred Securities Guarantee Trustee, upon the occurrence of an Event of Default, of its obligation to exercise the rights and powers vested in it by the terms of this Preferred Securities Guarantee. (vii) The Preferred Securities Guarantee Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture, note, other evidence of indebtedness or other paper or document, but the Preferred Securities 11 15 Guarantee Trustee may make, in its discretion, such further inquiry or investigation into such facts or matters as it may see fit. (viii) The Preferred Securities Guarantee Trustee may execute any of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents, nominees, custodians or attorneys, and the Preferred Securities Guarantee Trustee shall not be responsible for any misconduct or negligence on the part of any agent or attorney appointed with due care by it hereunder. (ix) Any action taken by the Preferred Securities Guarantee Trustee or its agents hereunder shall bind the Holders of the Preferred Securities, and the signature of the Preferred Securities Guarantee Trustee or its agents alone shall be sufficient and effective to perform any such action and no third party shall be required to inquire as to the authority of the Preferred Securities Guarantee Trustee to so act or as to its compliance with any of the terms and provisions of this Preferred Securities Guarantee, both of which shall be conclusively evidenced by the Preferred Securities Guarantee Trustee's or its agent's taking such action. (x) Whenever in the administration of this Preferred Securities Guarantee the Preferred Securities Guarantee Trustee shall deem it desirable to receive instructions with respect to enforcing any remedy or right or taking any other action hereunder, the Preferred Securities Guarantee Trustee (A) may request instructions from the Holders of a Majority in Liquidation Amount of the Preferred Securities, (B) may refrain from enforcing such remedy or right or taking such other action until such instructions are received, and (C) shall be protected in conclusively relying on or acting in accordance with such instructions. (xi) Except as otherwise expressly provided by this Preferred Securities Guarantee, the Preferred Securities Guarantee Trustee shall not be under any obligation to take any action that is discretionary under the provisions of this Preferred Securities Guarantee. (xii) The Preferred Securities Guarantee Trustee shall not be liable for any action taken, suffered, or omitted to be taken by it in good faith, without negligence, and reasonably believed by it to be authorized or within the discretion or rights or powers conferred upon it by this Preferred Securities Guarantee. (b) No provision of this Preferred Securities Guarantee shall be deemed to impose any duty or obligation on the Preferred Securities Guarantee Trustee to perform any act or acts or exercise any right, power, duty or obligation conferred 12 16 or imposed on it in any jurisdiction in which it shall be illegal, or in which the Preferred Securities Guarantee Trustee shall be unqualified or incompetent in accordance with applicable law, to perform any such act or acts or to exercise any such right, power, duty or obligation. No permissive power or authority available to the Preferred Securities Guarantee Trustee shall be construed to be a duty. SECTION 3.03. Not Responsible for Recitals or Issuance of Preferred Securities Guarantee. The recitals contained in this Preferred Securities Guarantee shall be taken as the statements of the Guarantor, and the Preferred Securities Guarantee Trustee does not assume any responsibility for their correctness. The Preferred Securities Guarantee Trustee makes no representation as to the validity or sufficiency of this Preferred Securities Guarantee. ARTICLE 4 PREFERRED SECURITIES GUARANTEE TRUSTEE SECTION 4.01. Preferred Securities Guarantee Trustee; Eligibility. (a) There shall at all times be a Preferred Securities Guarantee Trustee which shall: (i) not be an Affiliate of the Guarantor; and (ii) be a corporation organized and doing business under the laws of the United States of America or any State or Territory thereof or of the District of Columbia, or a corporation or Person permitted by the Securities and Exchange Commission to act as an indenture trustee under the Trust Indenture Act, authorized under such laws to exercise corporate trust powers, having a combined capital and surplus of at least $50,000,000, and subject to supervision or examination by Federal, State, Territorial or District of Columbia authority. If such corporation publishes reports of condition at least annually, pursuant to law or to the requirements of the supervising or examining authority referred to above, then, for the purposes of this Section 4.01(a)(ii), the combined capital and surplus of such corporation shall be deemed to be its combined capital and surplus as set forth in its most recent report of condition so published. (b) If at any time the Preferred Securities Guarantee Trustee shall cease to be eligible to so act under Section 4.01(a), the Preferred Securities Guarantee Trustee shall immediately resign in the manner and with the effect set out in Section 4.02(c). (c) If the Preferred Securities Guarantee Trustee has or shall acquire any "conflicting interest" within the meaning of Section 310(b) of the Trust Indenture 13 17 Act, the Preferred Securities Guarantee Trustee and Guarantor shall in all respects comply with the provisions of Section 310(b) of the Trust Indenture Act. SECTION 4.02. Appointment, Removal and Resignation of Preferred Securities Guarantee Trustee. (a) Subject to Section 4.02(b), the Preferred Securities Guarantee Trustee may be appointed or removed without cause at any time by the Guarantor except during the occurrence and continuation of an Event of Default. (b) The Preferred Securities Guarantee Trustee shall not be removed in accordance with Section 4.02(a) until a Successor Preferred Securities Guarantee Trustee has been appointed and has accepted such appointment by written instrument executed by such Successor Preferred Securities Guarantee Trustee and delivered to the Guarantor. (c) The Preferred Securities Guarantee Trustee shall hold office until a Successor Preferred Securities Guarantee Trustee shall have been appointed or until its removal or resignation. The Preferred Securities Guarantee Trustee may resign from office (without need for prior or subsequent accounting) by an instrument in writing executed by the Preferred Securities Guarantee Trustee and delivered to the Guarantor, which resignation shall not take effect until a Successor Preferred Securities Guarantee Trustee has been appointed and has accepted such appointment by instrument in writing executed by such Successor Preferred Securities Guarantee Trustee and delivered to the Guarantor and the resigning Preferred Securities Guarantee Trustee. (d) If no Successor Preferred Securities Guarantee Trustee shall have been appointed and accepted appointment as provided in this Section 4.02 within 60 days after delivery of an instrument of removal or resignation, the Preferred Securities Guarantee Trustee resigning or being removed may petition any court of competent jurisdiction for appointment of a Successor Preferred Securities Guarantee Trustee. Such court may thereupon, after prescribing such notice, if any, as it may deem proper, appoint a Successor Preferred Securities Guarantee Trustee. (e) No Preferred Securities Guarantee Trustee shall be liable for the acts or omissions to act of any Successor Preferred Securities Guarantee Trustee. (f) Upon termination of this Preferred Securities Guarantee or removal or resignation of the Preferred Securities Guarantee Trustee pursuant to this Section 4.02, the Guarantor shall pay to the Preferred Securities Guarantee Trustee all amounts due to the Preferred Securities Guarantee Trustee accrued to the date of such termination, removal or resignation. 14 18 ARTICLE 5 GUARANTEE SECTION 5.01. Guarantee. The Guarantor irrevocably and unconditionally agrees to pay in full to the Holders the Guarantee Payments (without duplication of amounts theretofore paid by the Issuer), as and when due, regardless of any defense, right of set-off or counterclaim that the Issuer may have or assert. The Guarantor's obligation to make a Guarantee Payment may be satisfied by direct payment of the required amounts by the Guarantor to the Holders or by causing the Issuer to pay such amounts to the Holders. SECTION 5.02. Waiver of Notice and Demand. The Guarantor hereby waives notice of acceptance of this Preferred Securities Guarantee and of any liability to which it applies or may apply, presentment, demand for payment, any right to require a proceeding first against the Issuer or any other Person before proceeding against the Guarantor, protest, notice of nonpayment, notice of dishonor, notice of redemption and all other notices and demands. SECTION 5.03. Obligations Not Affected. The obligations, covenants, agreements and duties of the Guarantor under this Preferred Securities Guarantee shall in no way be affected or impaired by reason of the happening from time to time of any of the following: (a) the release or waiver, by operation of law or otherwise, of the performance or observance by the Issuer of any express or implied agreement, covenant, term or condition relating to the Preferred Securities to be performed or observed by the Issuer; (b) any failure, omission, delay or lack of diligence on the part of the Holders to enforce, assert or exercise any right, privilege, power or remedy conferred on the Holders pursuant to the terms of the Preferred Securities, or any action on the part of the Issuer granting indulgence or extension of any kind; (c) the voluntary or involuntary liquidation, dissolution, sale of any collateral, receivership, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment of debt of, or other similar proceedings affecting, the Issuer or any of the assets of the Issuer; (d) any invalidity of, or defect or deficiency in, the Preferred Securities; 15 19 (e) the settlement or compromise of any obligation guaranteed hereby or hereby incurred; or (f) any other circumstance whatsoever that might otherwise constitute a legal or equitable discharge or defense of a guarantor; it being the intent of this Section 5.03 that the obligations of the Guarantor with respect to the Guarantee Payments shall be absolute and unconditional under any and all circumstances. There shall be no obligation of the Holders to give notice to, or obtain consent of, the Guarantor with respect to the happening of any of the foregoing. SECTION 5.04. Rights of Holders. (a) The Holders of a Majority in Liquidation Amount of the Preferred Securities have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Preferred Securities Guarantee Trustee in respect of this Preferred Securities Guarantee or exercising any trust or power conferred upon the Preferred Securities Guarantee Trustee under this Preferred Securities Guarantee. (b) If the Preferred Securities Guarantee Trustee fails to enforce this Preferred Securities Guarantee, any Holder of Preferred Securities may institute a legal proceeding directly against the Guarantor to enforce the rights of such Holder under this Preferred Securities Guarantee, without first instituting a legal proceeding against the Issuer, the Preferred Securities Guarantee Trustee or any other person or entity. The Guarantor waives any right or remedy to require that any action be brought first against the Issuer or any other person or entity before proceeding directly against the Guarantor. Notwithstanding the foregoing, if the Guarantor has failed to make a required Guarantee Payment, a Holder of Preferred Securities may directly institute a proceeding against the Guarantor for enforcement of this Preferred Securities Guarantee for such Guarantee Payment. SECTION 5.05. Guarantee of Payment. This Preferred Securities Guarantee creates a guarantee of payment and not of collection. SECTION 5.06. Subrogation. The Guarantor shall be subrogated to all (if any) rights of the Holders of Preferred Securities against the Issuer in respect of any amounts paid to such Holders by the Guarantor under this Preferred Securities Guarantee; provided, however, that the Guarantor shall not (except to the extent required by mandatory provisions of law) be entitled to enforce or exercise any right that it may acquire by way of subrogation or any indemnity, reimbursement or other agreement, in all cases as a result of payment under this Preferred Securities Guarantee, if, at the time of any such payment, any amounts are due 16 20 and unpaid under this Preferred Securities Guarantee. If any amount shall be paid to the Guarantor in violation of the preceding sentence, the Guarantor agrees to hold such amount in trust for the Holders and to pay over such amount to the Holders. SECTION 5.07. Independent Obligations. The Guarantor acknowledges that its obligations hereunder are independent of the obligations of the Issuer with respect to the Preferred Securities, and that the Guarantor shall be liable as principal and as debtor hereunder to make Guarantee Payments pursuant to the terms of this Preferred Securities Guarantee notwithstanding the occurrence of any event referred to in subsections (a) through (f), inclusive, of Section 5.03 hereof. ARTICLE 6 LIMITATION OF TRANSACTIONS; SUBORDINATION SECTION 6.01. Limitation of Transactions. So long as any Preferred Securities remain outstanding, the Guarantor shall not (i) declare or pay any dividends or distributions on, or redeem, purchase, acquire, or make a liquidation payment with respect to, any of the Guarantor's capital stock (which includes common and preferred stock), (ii) make any payment of principal, interest or premium, if any, on or repay or repurchase or redeem any debt securities of the Guarantor (including any Other Debentures) that rank pari passu with or junior in right of payment to the Debentures or (iii) make any guarantee payments with respect to any guarantee by the Guarantor of the debt securities of any subsidiary of the Guarantor (including Other Guarantees) if such guarantee ranks pari passu or junior in right of payment to the Debentures (other than (a) dividends or distributions in shares of, or options, warrants or rights to subscribe for or purchase shares of, common stock of the Guarantor; (b) any declaration of a dividend in connection with the implementation of a stockholders' rights plan, or the issuance of stock under any such plan in the future, or the redemption or repurchase of any such rights pursuant thereto; (c) payments under this Preferred Securities Guarantee; (d) as a result of a reclassification of the Guarantor's capital stock or the exchange or the conversion of one class or series of the Guarantor's capital stock for another class or series of the Guarantor's capital stock; (e) the purchase of fractional interests in shares of the Guarantor's capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged; and (f) purchases of common stock related to the issuance of common stock or rights under any of the Guarantor's benefit and compensation plans for its directors, officers or employees or any of the Guarantor's dividend reinvestment plans) if at such time (x) there shall have occurred any event of which the Guarantor has actual knowledge that is, or with 17 21 the giving of notice or the lapse of time, or both, would be an Event of Default, (y) the Guarantor shall be in default with respect to its payment obligations under this Preferred Securities Guarantee or (z) the Guarantor shall have given notice of its election of the exercise of its right to extend the interest payment period pursuant to Section 4.01(b) of the Indenture and shall not have rescinded such notice, and any such extension shall have commenced and be continuing. SECTION 6.02. Ranking. This Preferred Securities Guarantee will constitute an unsecured obligation of the Guarantor and will rank (i) subordinate and junior in right of payment to all other liabilities of the Guarantor, including the Debenture, except any liabilities (including the Other Guarantees, the Common Securities Guarantee and the Other Common Securities Guarantees) made pari passu or subordinate by their terms, and (ii) senior to all capital stock now or hereafter issued by the Guarantor and to any guarantee now or hereafter entered into by the Guarantor in respect of any of its capital stock. The foregoing subordination shall not apply to amounts payable under Article 8. ARTICLE 7 TERMINATION SECTION 7.01. Termination. This Preferred Securities Guarantee shall terminate and be of no further force and effect upon (i) full payment of the applicable Redemption Price of all Preferred Securities or (ii) liquidation of the Issuer, upon full payment of all amounts due upon the dissolution and liquidation of the Issuer or upon the exchange of all the Preferred Securities upon distribution of the Debentures to the Holders of the Preferred Securities and the Common Securities. Notwithstanding the foregoing, this Preferred Securities Guarantee will continue to be effective or will be reinstated, as the case may be, if at any time any Holder of Preferred Securities must restore payment of any sums paid under the Preferred Securities or under this Preferred Securities Guarantee. ARTICLE 8 EXCULPATION, INDEMNIFICATION AND COMPENSATION SECTION 8.01. Exculpation. (a) No Indemnified Person shall be liable, responsible or accountable in damages or otherwise to the Guarantor or any Covered Person for any loss, damage, liability, expense or claim incurred by reason of any act or omission performed or omitted by such Indemnified Person in good faith in accordance with this Preferred Securities Guarantee and in a manner that such Indemnified Person reasonably believed to be within the scope of the 18 22 authority conferred on such Indemnified Person by this Preferred Securities Guarantee or by law, except that this provision shall not be deemed to modify Section 3.01(d). (b) An Indemnified Person shall be fully protected in relying in good faith upon the records of the Guarantor and upon such information, opinions, reports or statements presented to the Guarantor by any Person as to matters the Indemnified Person reasonably believes are within such other Person's professional or expert competence and who has been selected with reasonable care by or on behalf of the Guarantor, including information, opinions, reports or statements as to the value and amount of the assets, liabilities, profits, losses, or any other facts pertinent to the existence and amount of assets from which Distributions to Holders of Preferred Securities might properly be paid. SECTION 8.02. Indemnification. The Guarantor agrees to indemnify each Indemnified Person for, and to hold each Indemnified Person harmless against, any and all loss, liability, damage, claim or expense incurred without negligence or bad faith on its part, arising out of or in connection with the acceptance or administration of the trust or trusts hereunder, including the costs and expenses (including reasonable legal fees and expenses) of defending itself against, or investigating, any claim or liability in connection with the exercise or performance of any of its powers or duties hereunder. The obligation to indemnify as set forth in this Section 8.02 shall survive the termination of this Preferred Securities Guarantee or the resignation of removal of the Preferred Securities Guarantee Trustee. The Preferred Securities Guarantee Trustee will not claim or exact any lien or charge on any Guarantee Payments as a result of any amount due to it under this Preferred Securities Guarantee. SECTION 8.03. Compensation. The Guarantor agrees: (a) to pay to the Preferred Securities Guarantee Trustee from time to time such compensation as shall be agreed in writing between the Guarantor and the Preferred Securities Guarantee Trustee for all services rendered by it hereunder (which compensation shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust); and (b) to reimburse the Preferred Securities Guarantee Trustee upon its request for reasonable expenses, disbursements and advances incurred or made by the Preferred Securities Guarantee Trustee in accordance with any provision of this Preferred Securities Guarantee (including the reasonable compensation and the expenses and advances of its agents and counsel), except any such expense or advance as may be attributable to its negligence or bad faith. 19 23 Subject to Section 8.02, the Preferred Securities Guarantee Trustee shall have a claim and lien prior to the Holders as to all property and funds held by it hereunder for any amount owing to it or any predecessor Preferred Securities Guarantee Trustee for fees and expenses pursuant to this Article. ARTICLE 9 MISCELLANEOUS SECTION 9.01. Successors and Assigns. All guarantees and agreements contained in this Preferred Securities Guarantee shall bind the successors, assigns, receivers, trustees and representatives of the Guarantor and shall inure to the benefit of the Holders of the Preferred Securities then outstanding. Except in connection with any merger or consolidation of the Guarantor with or into another entity permitted by the Indenture or any sale, transfer or lease of the Guarantor's assets to another entity permitted by the Indenture, the Guarantor may not assign its rights or delegate its obligations under this Preferred Securities Guarantee. SECTION 9.02. Amendments. Except with respect to any changes that do not materially adversely affect the rights of Holders (in which case no approval of Holders will be required), this Preferred Securities Guarantee may only be amended with the prior approval of the Holders of a Majority in Liquidation Amount of the outstanding Preferred Securities (including the amount payable on redemption, liquidation or otherwise, plus accumulated and unpaid Distributions to the date upon which the voting percentages are determined). The provisions of Section 12.2 of the Trust Agreement with respect to meetings of Holders of the Securities apply to the giving of such approval. Except in connection with any permitted merger or consolidation of the Guarantor with or into another entity or any permitted sale, transfer or lease of the Guarantor's assets to another entity (as described in Article 5 of the Indenture), the Guarantor may not assign its rights or delegate its obligations under this Preferred Securities Guarantee without the prior approval of the Holders of a Majority in Liquidation Amount of the Preferred Securities then outstanding. SECTION 9.03. Notices. All notices provided for in this Preferred Securities Guarantee shall be in writing, duly signed by the party giving such notice, and shall be delivered, telecopied or mailed by first class mail, as follows: 20 24 (a) If given to the Issuer, in care of the Administrative Trustee at the Issuer's mailing address set forth below (or such other address as the Issuer may give notice of to the Holders of the Common Securities): Hercules Trust VI c/o Hercules Incorporated Hercules Plaza 1313 North Market Street Wilmington, Delaware 19894-0001 Attention: Israel J. Floyd, Administrative Trustee Telecopy: (302) 594-7252 (b) If given to the Preferred Securities Guarantee Trustee, at the Preferred Securities Guarantee Trustee's mailing address set forth below (or such other address as the Preferred Securities Guarantee Trustee may give notice of to the Holders of the Preferred Securities): The Chase Manhattan Bank c/o Chase Manhattan Trust Company, National Association One Liberty Place, 52nd Floor 1650 Market Street Philadelphia, Pennsylvania 19103 Attention: Capital Markets Fiduciary Services Telecopy: (215) 972-8372 (c) If given to the Guarantor, at the Guarantor's mailing address set forth below (or such other address as the Guarantor may give notice of to the Holders of the Preferred Securities): Hercules Incorporated Hercules Plaza 1313 North Market Street Wilmington, Delaware 19894-0001 Attention: Assistant Treasurer of Hercules and Corporate Secretary of Hercules Telecopy: (302) 594-7252 (d) If given to any Holder of Preferred Securities, at the address set forth on the books and records of the Issuer. All such notices shall be deemed to have been given when received in person, telecopied with receipt confirmed, or mailed by first class mail, postage prepaid except that if a notice or other document is refused delivery or cannot be 21 25 delivered because of a changed address of which no notice was given, such notice or other document shall be deemed to have been delivered on the date of such refusal or inability to deliver. SECTION 9.04. Benefit. This Preferred Securities Guarantee is solely for the benefit of the Holders of the Preferred Securities and, subject to Section 3.01(a), is not separately transferable from the Preferred Securities. SECTION 9.05. Governing Law. THIS PREFERRED SECURITIES GUARANTEE AND THE RIGHTS OF THE PARTIES HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND ALL RIGHTS AND REMEDIES SHALL BE GOVERNED BY SUCH LAWS WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS. 22 26 THIS PREFERRED SECURITIES GUARANTEE is executed as of the day and year first above written. HERCULES INCORPORATED, as Guarantor By: --------------------------------- Name: Title: THE CHASE MANHATTAN BANK, as Preferred Securities Guarantee Trustee By: --------------------------------- Name: Title: