Document:

Consulting Agreement

 Exhibit 10.1 
 CONSULTING AGREEMENT 
 THIS CONSULTING AGREEMENT (“Agreement”)
is made as of the 9th day of July, 2012 by and between BABCOCK & WILCOX POWER GENERATION GROUP, INC., a corporation existing under the laws of Delaware and having an office at 20 South Van Buren Avenue, Barberton, OH 44203-0351 (the
“Company”), and Richard L. Killion of 6700 Chatsworth Street NW, Canton, OH 44718 (the “Consultant”). 

WHEREAS the Company wishes to engage the services of the Consultant as specified herein, and the Consultant desires to undertake the
rendition of such services: 
 NOW, THEREFORE, the parties agree as follows: 

 

	 	1.	Description of Services – As requested by the Company, Mr. Killion shall serve as a special consultant furnishing advice, consultation and
related services including but not limited to: 

  

	 	1.	Strategic, project and compliance issues 

  

	 	2.	Organizational structure and coaching of key personnel 

  

	 	3.	Participation in project reviews and subsidiary board meetings 

 It is expressly understood and agreed by the parties that the level of consulting services to be provided by Mr. Killion hereunder is not reasonably anticipated to exceed 20% of the average level of
services he performed for the Company during the 36 month period ending on June 30, 2012. 
  

	 	2.	Status – During the Consulting Period, Mr. Killion shall be an independent contractor and shall not be an employee of the Company. The Company
shall not be entitled to exercise supervision over the details or methods of performance by Mr. Killion hereunder or to require adherence to specific procedures in performing services hereunder. Except as provided herein, Mr. Killion shall
not be subject to rules or regulations applicable to Company’s employees or any established work schedule or routine or other supervision of or direction by Company, as to hours worked or otherwise, provided, however, that all services rendered
hereunder shall be so rendered to the satisfaction of Company. Mr. Killion shall have no authority to obligate the Company to any agreement or to exercise any supervision or direction over the Company’s employees. Since Mr. Killion is
not an employee of the Company, he is not entitled to participate in any of the Company’s employee benefit plans, programs or arrangements provided, however, any payments or benefits that he may be entitled to as a result of previous employment
with the Company shall continue uninterrupted in accordance with the terms and conditions of each respective benefit plan or arrangement. 

  

	 	3.	 Responsibility for Taxes – Mr. Killion acknowledges that he is solely responsible for any and all taxes, interest and penalties
that may be imposed with respect to the payments provided under this Agreement and shall indemnify, defend and hold harmless the 

	 	
Company, its officers, directors, employees and agents, of and from all claims, suits, liabilities, damages or expenses relating to any liabilities incurred by the Company as a result of
Mr. Killion’s failure to pay income and other taxes associated with payments made hereunder. For the avoidance of doubt, Mr. Killion shall have no obligation under the foregoing indemnity resulting from the failure of B&W to
satisfy its own tax obligations. 

  

	 	4.	Compensation – Mr. Killion’s individual contact shall be J. Randall Data, or his designee, who shall be responsible for transmitting
requests for such advice and consultation from the Company where necessary to enable Mr. Killion to carry out his responsibilities hereunder. The Company agrees to pay Mr. Killion $10,000 per month, which amount will be payable on the last
day of each calendar month. The total hours of service to be performed by Mr. Killion in relation to the services reasonably anticipated to be provided hereunder shall not exceed 40 hours in any calendar month. In the event the Company requests
that Mr. Killion provide services under this Agreement not anticipated as of the effective date hereof, the Company also agrees to pay to Mr. Killion $250.00 per hour for hours worked in excess of 40 hours in any calendar month, up to a
maximum of 40 such hours in any calendar month. The Company also agrees to reimburse Mr. Killion for actual reasonable costs and expenses of airfare and other travel, meals and lodging incurred by Mr. Killion in rendering services
hereunder if he is requested to engage in business travel by the Company, but not any other fees, costs, or expenses. Mr. Killion shall submit a statement for each month in which services are rendered showing reimbursable travel related costs
and expenses payable with respect to services rendered during such month along with documentation substantiating expenses for which reimbursement is sought. The Company agrees to remit to Mr. Killion the appropriate amount upon receipt of such
invoices. 

  

	 	5.	Security and Non-Disclosure of Information – Mr. Killion shall be responsible for, and bear the expense of, compliance with governmental laws
and regulations applicable to the procurement, utilization or production of information in connection with the furnishing of services hereunder. Mr. Killion agrees that during the Consulting Period he will refrain from performing any act or
engaging in any course of conduct which has or may reasonably have the effect of demeaning the name or business reputation of the Company or affects adversely or may reasonably be expected to affect adversely the Company’s best interests,
economic or otherwise. Mr. Killion also acknowledges that applicable securities laws prohibit the trading of Company securities while in possession of any material non-public information, including information concerning the financial
condition, results of operations, business or prospects of the Company. 

  

	 	6.	 Property and Information – All property and information, including but not limited to reports, findings, recommendations, plans,
data, and memoranda of every description, and all copies thereof, furnished to Mr. Killion or developed in the course of or relating to the services rendered hereunder shall be the property of the Company and Mr. Killion shall not retain
copies of any such matter or material. Mr. Killion agrees that all inventions, discovery or improvements (whether patentable or not) made or conceived by Mr. Killion are and will remain the sole property of the Company, and
Mr. Killion further 

  
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agrees to assist the Company in obtaining patents in the Company’s name covering any such inventions, discoveries or improvements. 

 

	 	7.	Law – Mr. Killion will comply with all applicable laws and regulations in the course of his activities on the Company’s behalf. This
contract shall be constructed and governed under the laws of the State of Delaware. 

  

	 	8.	Code of Business Conduct – Mr. Killion expressly acknowledges that he has received and reviewed the most recent Code of Business Conduct of The
Babcock & Wilcox Company and Mr. Killion will conform his activities undertaken for or on behalf of the Company consistent with the principles of the highest ethical behavior as described therein. 

 

											
		 	Signature:	 	 /s/ Richard L. Killion
	 		 	Date:	 	 July 9, 2012

		 		 	Richard L. Killion	 		 		 	

  

	 	9.	Reports – Mr. Killion agrees that upon request, he will file periodic reports on his activities on the Company’s behalf.

  

	 	10.	Indemnity – Company agrees to protect, hold harmless, defend, and indemnify Mr. Killion from and against any and all claims, suits, and demands,
of any kind whatsoever, by whomsoever asserted, as a result of, or arising from, the consulting activities of Mr. Killion under this Agreement; provided however that the Company shall have no liability or responsibility under this provision for
any such claim, suit, or demand resulting from the failure to pay taxes, gross negligence or intentional misconduct of Mr. Killion, or from the breach, by Mr. Killion, of any provision of this Agreement. 

 

	 	11.	Conflict of Interest – The provisions of Paragraphs 5, 6 and 7 of the Agreement shall apply to all aspects of the consulting arrangement between
Mr. Killion and the Company. 

  

	 	12.	Term – The Consulting Period shall begin on July 9, 2012 and continue through December 31, 2012, unless terminated earlier by
Mr. Killion upon thirty (30) days advance written notice to the Company. The Consulting Period will be terminated without further liability or obligation on the part of the Company should Mr. Killion breach any of the terms or
covenants of this Agreement. 

  

	 	13.	General 

  

	 	a.	Failure on the part of either party (the “first party) to insist on strict compliance by the other with any provisions of this Agreement shall not constitute a
waiver of the other party’s obligations in respect thereof, or of the first party’s right hereunder to require strict compliance therein in the future. 

 

	 	b.	This Agreement sets forth the entire understanding of the parties as to the matters included herein, and can be amended or extended only by written Agreement signed by
both parties. 

  
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	 	c.	This Agreement shall be binding upon and inure to the benefit of the parties hereto and permitted assigns, and Consultant shall not convey or assign his rights or
obligations hereunder without the prior written consent of the Company. 

  

	 	d.	The obligations set forth in this Agreement are severable and divisible, and any clause or portion not enforceable thereof shall not cause the remainder of such clause
or of the other obligations contained herein from being enforceable. 

 IN WITNESS WHEREOF, this Agreement has been
executed as of the day and year first above written. 
  

					
	THE BABCOCK & WILCOX
POWER GENERATION GROUP, INC.	 		 	CONSULTANT
			
	 /s/ J. Randall Data
	 		 	 /s/ Richard L. Killion

	J. Randall Data	 		 	Richard L. Killion

  
 - 4 -Second Supplemental Indenture

 Exhibit 4.1 
 EXECUTION VERSION 
 CABOT CORPORATION 

Second Supplemental Indenture 
 Dated as of July 12, 2012 
 2.55% Notes due 2018 

3.70% Notes due 2022 
 (Second Supplemental to the Indenture Dated as of September 21, 2009) 

U.S. BANK NATIONAL ASSOCIATION, 
 as Trustee 

 SECOND SUPPLEMENTAL INDENTURE, dated as of July 12, 2012, between Cabot Corporation, a
corporation duly organized and existing under the laws of the State of Delaware (herein called the “Company”), and U.S. Bank National Association, as Trustee (herein called the “Trustee”); 

RECITALS: 

WHEREAS, the Company has heretofore executed and delivered to the Trustee an Indenture, dated as of September 21, 2009 (the
“Base Indenture”), providing for the issuance from time to time of the Company’s unsecured notes or other evidences of indebtedness (herein and therein called the “Securities”), to be issued in one or more
series as provided in the Base Indenture; 
 WHEREAS, Section 9.01(7) of the Base Indenture permits the Company and the
Trustee to enter into an indenture supplemental to the Base Indenture to establish the form and terms of any series of Securities without notice to or consent of any Securityholder; 

WHEREAS, Section 2.01 of the Base Indenture permits the form of Securities of any series to be established in an indenture
supplemental to the Base Indenture; 
 WHEREAS, pursuant to Sections 2.01 and 2.03 of the Base Indenture, the Company desires to
provide for the establishment of two new series of Securities under the Base Indenture, the form and substance of each such series of Securities and the terms, provisions and conditions thereof to be set forth as provided in the Base Indenture and
this Second Supplemental Indenture; 
 WHEREAS, all conditions and requirements necessary to make this Second Supplemental
Indenture, when executed and delivered, a valid agreement of the Company, in accordance with its terms, have been performed and filled; 
 NOW, THEREFORE, THIS SECOND SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in
consideration of the premises and the purchase of the Securities established by this Second Supplemental Indenture by the holders thereof (the “Holders”), it is mutually agreed, for the equal and proportionate benefit of all such
Holders, as follows: 
 ARTICLE I 
 Definitions and Other Provisions of General Application 

Section 1.01 Relation to Base Indenture. This Second Supplemental Indenture constitutes a part of the Base Indenture
(the provisions of which, as modified by this Second Supplemental Indenture), shall apply to each of the series of Securities established by this Second Supplemental Indenture but shall not modify, amend or otherwise affect the Base Indenture
insofar as it relates to any other series of Securities or modify, amend or otherwise affect in any manner the terms and conditions of the Securities of any other series. 

 Section 1.02 Definitions. For all purposes of this Second Supplemental
Indenture, the capitalized terms used herein (i) which are defined in this Section 1.02 have the respective meanings assigned hereto in this Section 1.02 and (ii) which are defined in the Base Indenture (and which are not defined
in this Section 1.02) have the respective meanings assigned thereto in the Base Indenture. For all purposes of this Second Supplemental Indenture: 
 (a) Unless the context otherwise requires, any reference to an Article or Section refers to an Article or Section, as the case may be, of this Second Supplemental Indenture; 

(b) The words “herein,” “hereof” and “hereunder” and words of similar import refer to this Second
Supplemental Indenture as a whole and not to any particular Article, Section or other subdivision; and 
 (c) The terms defined
in this Section 1.02(c) have the meanings assigned to them in this Section and include the plural as well as the singular. 

“2018 Notes” has the meaning set forth in Section 2.01(a). 

“2018 Notes Maturity Date” has the meaning set forth in Section 2.01(c). 

“2022 Notes” has the meaning set forth in Section 2.01(a). 

“2022 Notes Maturity Date” has the meaning set forth in Section 2.01(c). 

“Business Day” is any day, other than (i) a Saturday, Sunday or other day on which banking institutions in The City
of New York are authorized or required by law or executive order to remain closed. 
 “Change of Control” means
the occurrence of any of the following after the date of issuance of the Notes: 
 (1) the direct or indirect sale, lease,
transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the assets of the Company and its subsidiaries taken as a whole to any
“person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) other than to the Company or one of its subsidiaries; 
 (2) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” or “group” (as those terms are used in
Section 13(d)(3) of the Exchange Act, it being agreed that an employee of the Company or any of its subsidiaries for whom shares are held under an employee stock ownership, employee retirement, employee savings or similar plan and whose shares
are voted in accordance with the instructions of such employee shall not be a member of a “group” (as that term is used in Section 13(d)(3) of the Exchange Act) solely because such employee’s shares are held by a trustee under
said plan), other than the Company or one of its subsidiaries, becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of the Company’s Voting Stock representing more than
50% of the voting power of the Company’s outstanding Voting Stock; provided that a merger shall not constitute a “change of control” under 

  
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this definition if (i) the sole purpose of the merger is the reincorporation of the Company in another state and (ii) the shareholders and the number of shares of Voting Stock of the
Company, measured by voting power and number of shares, owned by each of them immediately before and immediately following such merger are identical; 
 (3) the Company consolidates with, or merges with or into, any Person, or any Person consolidates with, or merges with or into, the Company, in any such event pursuant to a transaction in which any of the
Company’s outstanding Voting Stock or Voting Stock of such other Person is converted into or exchanged for cash, securities or other property, other than any such transaction where the Company’s outstanding Voting Stock immediately prior
to such transaction constitutes, or is converted into or exchanged for, Voting Stock representing more than 50% of the voting power of the Voting Stock of the surviving Person immediately after giving effect to such transaction; 

(4) during any period of 24 consecutive calendar months, the majority of the members of the Board of Directors shall no longer be
composed of individuals (a) who were members of the Board of Directors on the first day of such period or (b) whose nomination or election (either by a specific vote or by approval of the Company’s proxy statement in which such member
was named as a nominee for election as a director) to the Board of Directors was approved by (i) individuals referred to in clause (a) above or (ii) other directors described in this clause (b), in each case collectively constituting,
at the time of such nomination or election, at least a majority of the Board of Directors or, if directors are nominated by a committee of the Board of Directors, constituting at the time of such nomination, at least a majority of such committee; or

 (5) the adoption, by the Board of Directors or the Company’s shareholders, of a plan relating to the liquidation or
dissolution of the Company. 
 “Change of Control Offer” has the meaning set forth in Section 3.01.

 “Change of Control Payment” has the meaning set forth in Section 3.01. 

“Change of Control Payment Date” has the meaning set forth in Section 3.01. 

“Change of Control Triggering Event” means, with respect to a series of Notes, such series of Notes is rated below
Investment Grade by both of the Rating Agencies on any date during the period (the “Trigger Period”) commencing on the first public announcement by the Company of any Change of Control (or pending Change of Control) and ending 60
days following consummation of such Change of Control (which Trigger Period will be extended following consummation of a Change of Control for so long as any of the Rating Agencies has publicly announced that it is considering a possible ratings
downgrade); provided that a particular downgrade in rating shall not be deemed to have occurred in respect of a particular Change in Control (and thus shall not result in a Change of Control Triggering Event) if any of the Rating Agencies
making the downgrade in rating to which this definition would otherwise apply does not announce or publicly confirm or inform the Trustee in writing at its request that the downgrade was the result, in whole or in part, of any event or circumstance
comprising of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the 

  
 3 

 
applicable Change of Control shall have occurred at the time of the Rating Event). If a Rating Agency is not providing a rating for such series of Notes at the commencement of any Trigger Period,
such series of Notes will be deemed to have ceased to be called Investment Grade by such Rating Agency during that Trigger Period. Notwithstanding the foregoing, no Change of Control Triggering Event will be deemed to have occurred in connection
with any particular Change of Control unless and until such Change of Control has actually been consummated. 

“Government Securities” means securities that are: 

(1) direct obligations of the United States of America for the timely payment of which its full faith and credit is pledged; or

 (2) obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States of
America the timely payment of which is unconditionally guaranteed as a full faith and credit obligation by the United States of America, 

which, in either case, are not callable or redeemable at the option of the issuers thereof, and shall also include a depository receipt issued by a bank
(as defined in Section 3(a)(2) of the Securities Act of 1933, as amended), as custodian with respect to any such Government Securities or a specific payment of principal of or interest on any such Government Securities held by such custodian
for the account of the holder of such depository receipt; provided that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depository receipt from any amount
received by the custodian in respect of the Government Securities or the specific payment of principal of or interest on the Government Securities evidenced by such depository receipt. 

“Interest Payment Date” has the meaning set forth in Section 2.01(d). 

“Interest Period” has the meaning set forth in Section 2.01(d). 

“Investment Grade” means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating
category of Moody’s) and a rating of BBB- or better by S&P (or its equivalent under any successor rating category of S&P), and the equivalent investment grade credit rating from any replacement Rating Agency or Rating Agencies selected
by the Company under the circumstances permitting the Company to select a replacement agency and in the manner for selecting a replacement agency, in each case as set forth in the definition of “Rating Agency.” 

“Maturity Date” has the meaning set forth in 2.01(c). 

“Moody’s” means Moody’s Investors Service, Inc., a subsidiary of Moody’s Corporation, and its successors.

 “Notes” has the meaning set forth in Section 2.01(a). 

“Person” means any individual, corporation, partnership, limited liability company, business trust, association,
joint-stock company, joint venture, trust, incorporated or unincorporated organization or government or any agency or political subdivision thereof. 

  
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 “Rating Agency” means each of Moody’s and S&P; provided,
that if any of Moody’s or S&P ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of the Company’s control, the Company may appoint another “nationally recognized statistical
rating organization” as such term is defined in Section 3(a)(62) under the Exchange Act as a replacement for Moody’s or S&P, or both of them, as the case may be; provided that the Company shall give notice of such
appointment to the Trustee. 
 “Redemption Date”, when used with respect to any Note, means the date fixed for
such redemption by or pursuant to this Second Supplemental Indenture. 
 “Redemption Price”, when used with
respect to any Note to be redeemed, means the price at which it is to be redeemed pursuant to this Second Supplemental Indenture. 
 “S&P” means Standard & Poor’s, a division of McGraw-Hill Companies, Inc., and its successors. 
 “Special Mandatory Redemption Date”, when used with respect to any Note, means the date fixed for such mandatory redemption by or pursuant to this Second Supplemental Indenture.

 “Voting Stock” of any specified Person as of any date means the capital stock of such Person that is at the
time entitled to vote generally in the election of the board of directors of such Person. 
 ARTICLE II 

General Terms and Conditions of the Notes 
 Section 2.01 Terms of Notes. Pursuant to Sections 2.01 and 2.03 of the Base Indenture, there is hereby established two series of Securities, the terms of which shall be as follows: 

(a) Designation. The Securities of the two series shall be known and designated, as applicable, as the “2.55%
Notes due 2018” (the “2018 Notes”) and the “3.70% Notes due 2022” (the “2022 Notes” and, together with the 2018 Notes, the “Notes”), in each case, of the Company. The CUSIP number of
the 2018 Notes is 127055 AJ0 and the CUSIP number of the 2022 Notes is 127055 AH4. 
 (b) Form and
Denominations. The Notes will be issued only in fully registered form, and the authorized denominations of the Notes shall be $2,000 principal amount and any integral multiple of $1,000 above that amount. The Notes of each series will initially
be issued in the form of one or more Global Securities substantially in the form of Annex A-1 and Annex A-2, as applicable, attached hereto, with such modifications thereto as may be approved by the authorized officer executing the same. The Notes
will be denominated in U.S. Dollars and payments of principal and interest will be made in U.S. Dollars. 

  
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 (c) Maturity Dates. The principal amount of, and all accrued and
unpaid interest on, the 2018 Notes shall be payable in full on January 15, 2018, or if such day is not a Business Day, the following Business Day (each, the “2018 Notes Maturity Date”). The principal amount of, and all accrued
and unpaid interest on, the 2022 Notes shall be payable in full on July 15, 2022, or if such day is not a Business Day, the following Business Day (each, the “2022 Notes Maturity Date” and, either of the 2018 Notes Maturity
Date or 2022 Notes Maturity Date, a “Maturity Date”). 
 (d) Interest. Interest payable
on any Interest Payment Date (as defined below), either Maturity Date, or if applicable, the Redemption Date or Special Mandatory Redemption Date shall be the amount accrued from, and including, the immediately preceding Interest Payment Date in
respect of which interest has been paid or duly provided for (or from and including the original issue date of July 12, 2012, if no interest has been paid or duly provided for with respect to the Notes) but excluding such Interest Payment Date,
Maturity Date or, if applicable, Redemption Date or Special Mandatory Redemption Date, as the case may be (each, an “Interest Period”). The 2018 Notes will bear interest at the rate of 2.55% per year and the 2022 Notes will
bear interest at a rate of 3.70% per year, in each case from the original issue date thereof to the Maturity Date with respect to such series of Notes. Interest on the Notes shall be payable semi-annually in arrears on January 15 and
July 15 of each year, beginning on January 15, 2013 (each such date, an “Interest Payment Date”). The amount of interest payable for any semi-annual Interest Period will be computed on the basis of a 360-day year
consisting of twelve 30-day months. The amount of interest payable for any period shorter than a full semi-annual Interest Period for which interest is computed will be computed on the basis of the actual number of days elapsed per 30-day month. In
the event any Interest Payment Date on or before the applicable Maturity Date falls on a day that is not a Business Day, the interest payment due on that date will be postponed to the next day that is a Business Day and no interest shall accrue as a
result of such postponement. 
 In the event the Maturity Date or a Redemption Date for any Note falls on a day that is not a
Business Day, then the related payments of principal, premium, if any, and interest may be made on the next succeeding date that is a Business Day (and no additional interest will accumulate on the amount payable for the period from and after the
Maturity Date or a Redemption Date for such Note). Interest due on such Maturity Date or such Redemption Date (in each case, whether or not an Interest Payment Date) will be paid to the Person to whom principal of such Notes is payable. 

(e) To Whom Interest is Payable. Interest shall be payable to the Person in whose name the Notes are registered at
the close of business on the regular record date for such interest, which shall be the January 15 or July 15 (whether or not either is a Business Day), as the case may be, next preceding the Interest Payment Date, or in the event the Notes
cease to be held in the form of one or more Global Securities, at the close of business on the date 15 days prior to that Interest Payment Date, whether or not a Business Day. 

(f) Sinking Fund; Holder Repurchase Right. The Notes shall not be subject to any sinking fund or analogous
provision or be redeemable at the option of the Holders. 

  
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 (g) Forms. The 2018 Notes shall be substantially in the form of Annex
A-1 attached hereto and the 2022 Notes shall be substantially in the form of Annex A-2 attached hereto, in each case, with such modifications thereto as may be approved by the authorized officer executing the same. 

(h) Registrar, Paying Agent and Place of Payment. The Company hereby appoints U.S. Bank National Association as
Registrar and Paying Agent with respect to the Notes. The Notes may be surrendered for registration of transfer and for exchange at 100 Wall Street, Suite 1600, New York, New York 10005 or at any other office or agency maintained by the Company for
such purpose. The place of payment for the Notes shall be the Paying Agent’s office in New York, New York. 
 ARTICLE III

 Change of Control Repurchase Event 
 Section 3.01 Change of Control Repurchase Events. Upon the occurrence of a Change of Control Triggering Event with respect to a series of Notes, unless the Company is required to redeem such series
of Notes in accordance with this Second Supplemental Indenture or the terms of such series of Notes or the Company has exercised its right to redeem such series of Notes by giving irrevocable notice to the Trustee in accordance with this Second
Supplemental Indenture, each Holder of such series of Notes shall have the right to require the Company to purchase all or a portion of such Holder’s Notes pursuant to the offer described below (the “Change of Control Offer”),
at a purchase price equal to 101% of the principal amount thereof plus accrued and unpaid interest, if any, to the date of purchase (the “Change of Control Payment”), subject to the rights of Holders of such series of Notes on the
relevant record date to receive interest due on the relevant Interest Payment Date. 
 Within 30 days following the date upon
which the Change of Control Triggering Event occurred with respect to such series of Notes, or at the Company’s option, prior to any Change of Control but after the first public announcement by the Company of the pending Change of Control if a
definitive agreement is in place with respect to the event constituting a Change of Control at the time of mailing the Change of Control Offer, the Company shall be required to send, by first class mail, a notice to each Holder of such series of
Notes, with a copy to the Trustee, which notice shall govern the terms of the Change of Control Offer. Such notice shall state, among other things, the purchase date, which must be no earlier than 30 days nor later than 60 days from the date such
notice is mailed, other than as may be required by law (the “Change of Control Payment Date”). The notice, if mailed prior to the date of consummation of the Change of Control, shall state that the Change of Control Offer is
conditioned on the Change of Control being consummated on or prior to the Change of Control Payment Date. 
 On the Change of
Control Payment Date, the Company shall, to the extent lawful: 
  

	 	•	 	 accept or cause a third party to accept for payment all Notes or portions of Notes properly tendered pursuant to Change of Control Offer;

  
 7 

	 	•	 	 deposit or cause a third party to deposit with the Paying Agent an amount equal to the Change of Control Payment in respect of all Notes or portions of
Notes properly tendered; and 

  

	 	•	 	 deliver or cause to be delivered to the Trustee the Notes properly accepted together with an Officers’ Certificate stating the aggregate principal
amount of Notes or portions of Notes being repurchased and that all conditions precedent to the Change of Control Offer and to the repurchase by the Company or by a third party of Notes pursuant to the Change of Control Offer have been complied
with. 

 The Company shall not be required to make a Change of Control Offer with respect to a series of Notes
if a third party makes such an offer in the manner, at the times and otherwise in compliance with the requirements for such an offer made by the Company and such third party purchases all the Notes properly tendered and not withdrawn under its
offer. 
 The Company shall comply in all material respects with the requirements of Rule 14e-1 under the Exchange Act and any
other securities laws and regulations thereunder, to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Triggering Event. To the extent that the provisions of any
such securities laws or regulations conflict with the Change of Control Offer provisions of the Notes, the Company shall comply with those securities laws and regulations and shall not be deemed to have breached its obligations under this
Section 3.01 by virtue of any such conflict. 
 ARTICLE IV 

Legal Defeasance and Covenant Defeasance 
 Section 4.01 Company’s Option to Effect Legal Defeasance or Covenant Defeasance. 
 The Company may at its option by or pursuant to a Board Vote, at any time, with respect to each of the series of Notes, elect to have either Section 4.02 or 4.03 be applied to all outstanding Notes
of such series upon compliance with the conditions set forth below in this Article IV. 
 Section 4.02 Legal
Defeasance and Discharge. 
 Upon the Company’s exercise under Section 4.01 hereof of the option applicable to
this Section 4.02 with respect to any series of Notes, the Company shall, subject to the satisfaction of the conditions set forth in Section 4.04 hereof, be deemed to have been discharged from its obligations with respect to all
outstanding Notes of such series on the date the conditions set forth below are satisfied (“Legal Defeasance”). For this purpose, Legal Defeasance means that the Company shall be deemed to have paid and discharged the entire
Indebtedness represented by the outstanding Notes of such series, which shall thereafter be deemed to be “outstanding” only for the purposes of Section 4.05 hereof and the other Sections of this Second Supplemental Indenture referred
to in clauses (a) and (b) below, to have satisfied all its other obligations under the Notes of such series and the Indenture (and the Trustee, on demand of and at the expense of the Company, shall execute proper instruments acknowledging
the same) and to have cured all then existing Events of Default, except for the following provisions which shall survive until otherwise terminated or discharged hereunder: 

  
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 (a) the rights of Holders of such series of Notes to receive payments in
respect of the principal of, premium, if any, and interest on the Notes of such series when such payments are due solely out of the trust created pursuant to this Second Supplemental Indenture referred to in Section 4.04 hereof; 

(b) the Company’s obligations with respect to such series of Notes concerning issuing temporary Notes, registration
of such Notes, mutilated, destroyed, lost or stolen Notes and the maintenance of an office or agency for payment and money for security payments held in trust; 
 (c) the rights, powers, trusts, duties and immunities of the Trustee, and the Company’s obligations in connection therewith; and 

(d) this Article IV. 
 Subject to compliance with this Article IV, the Company may exercise its option under this Section 4.02 notwithstanding the prior exercise of its option under Section 4.03 hereof. 

Section 4.03 Covenant Defeasance. 
 Upon the Company’s exercise under Section 4.01 hereof of the option applicable to this Section 4.03, the Company shall, subject to the satisfaction of the conditions set forth in
Section 4.04 hereof, be released from its obligations under the covenants (each, a “Defeased Covenant,” and collectively, the “Defeased Covenants”) contained in sections 4.03, 4.04, 4.05, 4.06, 4.08 and 5.02 of
the Base Indenture, with respect to the outstanding Notes of such series on and after the date the conditions set forth in Section 4.04 hereof are satisfied (“Covenant Defeasance”), and the Notes of such series shall thereafter
be deemed not “outstanding” for the purposes of any direction, waiver, consent or declaration or act of Holders (and the consequences of any thereof) in connection with such Defeased Covenants, but shall continue to be deemed
“outstanding” for all other purposes hereunder (it being understood that the Notes of such series shall not be deemed outstanding for accounting purposes). For this purpose, Covenant Defeasance means that, with respect to the outstanding
Notes of such series, the Company may omit to comply with and shall have no liability in respect of any term, condition or limitation set forth in any such Defeased Covenant, whether directly or indirectly, by reason of any reference elsewhere
herein to any such Defeased Covenant or by reason of any reference in any such Defeased Covenant to any other provision herein or in any other document and such omission to comply shall not constitute a Default or an Event of Default under section
6.01 of the Base Indenture, but, except as specified above, the remainder of the Indenture and the Notes of such series shall be unaffected thereby. In addition, upon the Company’s exercise under Section 4.01 hereof of the option
applicable to this Section 4.03 hereof, subject to the satisfaction of the conditions set forth in Section 4.04 hereof, section 6.01(4) of the Base Indenture shall not constitute an Event of Default. 

  
 9 

 Section 4.04 Conditions to Legal or Covenant Defeasance. 

In order to exercise either Legal Defeasance or Covenant Defeasance under either Section 4.02 or 4.03 hereof with respect to either
series of Notes: 
 (1) the Company must irrevocably deposit with the Trustee, in trust, for the benefit of the Holders of the
Notes of such series, cash in U.S. dollars, U.S. dollar-denominated Government Securities, or a combination thereof, in such amounts as will be sufficient, in the opinion of a nationally recognized investment bank, appraisal firm or firm of
independent public accountants, to pay the principal of, premium, if any, and interest due on the Notes of such series on the date of maturity or redemption thereof, as the case may be, and the Company must specify whether the Notes of such series
are being defeased to maturity or to a particular redemption date; 
 (2) in the case of Legal Defeasance, the Company shall have
delivered to the Trustee an Opinion of Counsel reasonably acceptable to the Trustee confirming that, subject to customary assumptions and exclusions, 
 (a) the Company has received from, or there has been published by, the United States Internal Revenue Service a ruling, or 

(b) since the date of this Supplemental Indenture, there has been a change in the applicable U.S. federal income tax law,

 in either case to the effect that, and based thereon such Opinion of Counsel shall confirm that, subject to customary assumptions and
exclusions, the Holders of the Notes of such series will not recognize income, gain or loss for U.S. federal income tax purposes, as applicable, as a result of such Legal Defeasance and will be subject to U.S. federal income tax on the same amounts,
in the same manner and at the same times as would have been the case if such Legal Defeasance had not occurred; 
 (3) in the
case of Covenant Defeasance, the Company shall have delivered to the Trustee an Opinion of Counsel reasonably acceptable to the Trustee confirming that, subject to customary assumptions and exclusions, the Holders of the Notes of such series will
not recognize income, gain or loss for U.S. federal income tax purposes as a result of such Covenant Defeasance and will be subject to such tax on the same amounts, in the same manner and at the same times as would have been the case if such
Covenant Defeasance had not occurred; 
 (4) no Default or Event of Default (other than that resulting from any borrowing of
funds to be applied to make the deposit required to effect such Legal Defeasance or Covenant Defeasance and any similar and simultaneous deposit relating to other Debt and, in each case, the granting of Liens in connection therewith) shall have
occurred and be continuing on the date of such deposit; 
 (5) such Legal Defeasance or Covenant Defeasance shall not result in a
breach or violation of, or constitute a default under, any other agreement or instrument to which the Company is a party or by which it is bound (other than an Event of Default resulting from borrowing of funds to be applied to such deposit and any
similar and simultaneous deposit relating to other indebtedness, and in each case, the grant of any lien securing such borrowing); 

  
 10 

 (6) the Company must deliver to the Trustee an Officers’ Certificate stating that the
deposit was not made by the Company with the intent of defeating, hindering, delaying or defrauding any creditors of the Company or others; and 
 (7) the Company shall have delivered to the Trustee an Officers’ Certificate and an Opinion of Counsel (which Opinion of Counsel may be subject to customary assumptions and exclusions) each stating
that all conditions precedent provided for or relating to the Legal Defeasance or the Covenant Defeasance, as the case may be, have been complied with. 
 Section 4.05 Deposited Money and Government Securities to be Held in Trust; Other Miscellaneous Provisions. 
 Subject to Section 4.06 hereof, all money and Government Securities (including the proceeds thereof) deposited with the Trustee pursuant to Section 4.04 hereof in respect of the outstanding
Notes of such series shall be held in trust and applied by the Trustee, in accordance with the provisions of such Notes and this Second Supplemental Indenture, to the payment, either directly or through any Paying Agent (including the Company acting
as Paying Agent) as the Trustee may determine, to the Holders of the Notes of such series of all sums due and to become due thereon in respect of principal, premium, if any, and interest, but such money need not be segregated from other funds except
to the extent required by law. 
 The Company shall pay and indemnify the Trustee against any tax, fee or other charge imposed
on or assessed against the cash or Government Securities deposited pursuant to Section 4.04 hereof or the principal and interest received in respect thereof other than any such tax, fee or other charge which by law is for the account of the
Holders of the outstanding Notes of such series. 
 Anything in this Article 4 to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon the request of the Company any money or Government Securities held by it as provided in Section 4.04 hereof which, in the opinion of a nationally recognized firm of independent public
accountants expressed in a written certification thereof delivered to the Trustee (which may be the opinion delivered under Section 4.04(1) hereof), are in excess of the amount thereof that would then be required to be deposited to effect an
equivalent Legal Defeasance or Covenant Defeasance. 
 Section 4.06 Repayment to Company. 

Any money deposited with the Trustee or any Paying Agent, or then held by the Company, in trust for the payment of the principal of,
premium, if any, or interest on any Note and remaining unclaimed for two years after such principal, and premium, if any, or interest has become due and payable shall be paid to the Company on its request or (if then held by the Company) shall be
discharged from such trust; and the Holder of such Note shall thereafter look only to the Company for payment thereof, and all liability of the Trustee or such Paying Agent with respect to such trust money, and all liability of the Company as
trustee thereof, shall thereupon cease. 

  
 11 

 Section 4.07 Reinstatement. 

If the Trustee or Paying Agent is unable to apply any United States dollars or Government Securities in accordance with Section 4.02
or 4.03 hereof, as the case may be, by reason of any order or judgment of any court or governmental authority enjoining, restraining or otherwise prohibiting such application, then the Company’s obligations under the Indenture and the Notes of
such series shall be revived and reinstated as though no deposit had occurred pursuant to Section 4.02 or 4.03 hereof until such time as the Trustee or Paying Agent is permitted to apply all such money in accordance with Section 4.02 or
4.03 hereof, as the case may be; provided that, if the Company makes any payment of principal of, premium, if any, or interest on any Note following the reinstatement of its obligations, the Company shall be subrogated to the rights of the
Holders of such Notes to receive such payment from the money held by the Trustee or Paying Agent. 
 ARTICLE V 

Miscellaneous 
 Section 5.01 Relationship to Existing Base Indenture. The Second Supplemental Indenture is a supplemental indenture within the meaning of the Base Indenture. The Base Indenture, as
supplemented and amended by this Second Supplemental Indenture, is in all respects ratified, confirmed and approved and, with respect to the Notes, the Base Indenture, as supplemented and amended by this Second Supplemental Indenture, shall be read,
taken and construed as one and the same instrument. 
 Section 5.02 Modification of the Existing Base Indenture.
Except as expressly modified by this Second Supplemental Indenture, the provisions of the Base Indenture shall govern the terms and conditions of the Notes. 
 Section 5.03 Governing Law. This instrument shall be governed by, and construed in accordance with, the laws of the State of New York. 

Section 5.04 Counterparts. This instrument may be executed in any number of counterparts, each of which so executed shall be
deemed to be an original, but all such counterparts shall together constitute but one and the same instrument. 

Section 5.05 Makes No Representation. The recitals contained herein are made by the Company and not by the Trustee, and the
Trustee assumes no responsibility for the correctness thereof. The Trustee makes no representation as to the validity or sufficiency of this Second Supplemental Indenture (except for its execution thereof and its certificates of authentication of
the Notes). 

  
 12 

 IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be
duly executed, and their respective corporate seals, if applicable, to be hereunto affixed and attested, all as of the day and year first written above. 

 

			
	CABOT CORPORATION
		
	By:  	 	/s/ Eduardo E. Cordeiro
		 	Name: Eduardo E. Cordeiro
		 	Title: Chief Financial Officer and Executive Vice President
		
	Attest:  	 	/s/ Karen Abrams
	
	(SEAL)
	
	U.S. BANK NATIONAL ASSOCIATION
		
	By:  	 	/s/ Beverly A. Freeney
		 	Name: Beverly A. Freeney
		 	Title: Vice President
		
	Attest:  	 	/s/ K. Wendy Kumar

 ANNEX A-1 
 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY (AS DEFINED IN THE INDENTURE) OR A NOMINEE OF THE DEPOSITORY.
THIS GLOBAL SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF ANY PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE AND IN
PART FOR SECURITIES IN DEFINITIVE FORM, MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH
NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY. 
 UNLESS THIS CERTIFICATE IS PRESENTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME
OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE
OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 CABOT CORPORATION 
 2.55% Notes due 2018 

 

			
	No.         	  	CUSIP NO. 127055 AJ0
		  	$                         

 Cabot Corporation, a corporation duly incorporated and subsisting under the laws of the State of Delaware
(herein called the “Company”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of
            MILLION U.S. Dollars (U.S. $             ) on January 15, 2018 and to pay interest thereon from July 12,
2012 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on January 15 and July 15 in each year, commencing Janaury 15, 2013, at the rate of 2.55% per annum, until the
principal hereof is paid or made available for payment. 
 The interest so payable, and punctually paid or duly provided for, on
any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Note (or one or more predecessor securities) is registered at the close of business on the regular record date for such interest, which shall be
the January 1 or July 1 (whether or not a Business Day), as 

  
 A-1-1

 
the case may be, next preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such regular record
date and may either be paid to the Person in whose name this Note (or one or more predecessor securities) is registered at the close of business on a special record date for the payment of such defaulted interest to be fixed by the Trustee, notice
whereof shall be given to Holders of Notes of this series not less than 5 days prior to such special record date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes
of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. 
 Payment of the principal of (and premium, if any) and interest on this Note shall be made at the office or agency of the Trustee maintained for that purpose in New York, New York, in such currency of the
United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, for so long as the Notes are represented in global form by one or more Global Securities, all payments of
principal (and premium, if any) and interest shall be made by wire transfer of immediately available funds to the Depository or its nominee, as the case may be, as the registered owner of the Global Security representing such Notes. In the event
that definitive Notes shall have been issued, all payments of principal (and premium, if any) and interest shall be made by wire transfer of immediately available funds to the accounts of the registered Holders thereof; provided, that the
Company may at its option pay interest by check to the registered address of each Holder of a definitive Note. 
 Reference is
hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature,
this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 

  
 A-1-2

 IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its
corporate seal. 
  

			
	CABOT CORPORATION
		
	By: 	 	 
		 	Name:
		 	Title:
	
	[Seal]
		
	By: 	 	 
		 	Name:
		 	Title:

 This is one of the Securities of the series designated therein issued under the within mentioned
Indenture. 
  

			
	 U.S. BANK NATIONAL ASSOCIATION,
   as Trustee

		
	By: 	 	 
		 	Name:
		 	Title:

  
 A-1-3

 [Form of Reverse of 2018 Note] 

This Note is one of a duly authorized issue of securities of the Company (herein called the “Notes”), issued and to be
issued in one or more series under an Indenture, dated as of September 21, 2009 (herein called the “Base Indenture”, which term shall have the meaning assigned to it in such instrument), as supplemented by a Second Supplemental
Indenture, dated as of July 12, 2012 (herein called the “Second Supplemental Indenture”, and together with the Base Indenture, the “Indenture”), between the Company and U.S. Bank National Association, as
Trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, obligations, duties
and immunities thereunder of the Company, the Trustee and the Holders of the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof, initially limited
in aggregate principal amount to $250,000,000. The Company may at any time issue additional securities under the Indenture in unlimited amounts having the same terms as the Notes so that such additional securities shall be consolidated with the
Notes, including for purposes of voting and redemption; provided that no additional securities of a series may be issued if an Event of Default has occurred and is continuing with respect to such series of securities. Any such additional
securities shall, together with the outstanding Notes, constitute a single series of debt securities under the Indenture. 
 The
Notes of this series are subject to a special mandatory redemption feature. Within five Business Days following the earlier of (a) the date on which an Acquisition Termination Event occurs and (b) 5:00 p.m. (New York City time) on
December 31, 2012, if the Norit Acquisition has not closed by such date, the Company shall be required to mail a notice of mandatory redemption to the Holders of the Notes of this series fixing the date of such mandatory redemption (such date
to be 30 days from the mailing of the notice of mandatory redemption) (the “Special Mandatory Redemption Date”). On such Special Mandatory Redemption Date, the Company shall be required to redeem the Notes of such series, in whole
but not in part, at a redemption price equal to 101% of the aggregate principal amount of the Notes, plus accrued and unpaid interest on the Notes to the Special Mandatory Redemption Date. 

“Acquisition Agreement” means the signing protocol letter agreement entered into between the Company and N Beta
S.à r.l. (the “Seller”), dated June 21, 2012 and the Agreement for the Sale and Purchase of the Entire Issued Share Capital of Norit N.V. among the Company, the Seller and Norit attached to such letter agreement as
Schedule 1. 
 “Acquisition Termination Event” means either (1) the Acquisition Agreement being rescinded
or terminated or (2) the Company determines in its reasonable judgment that the Acquisition will not occur. 

“Norit Acquisition” means the proposed acquisition by the Company of all of the issued and outstanding equity interests
of Norit N.V., a Dutch public limited liability company (naamloze vennootschap) (“Norit”). 

  
 A-1-4

 The Notes of this series are also subject to redemption, at the option of the Company, at
any time and from time to time, in whole or in part, upon not less than 30 nor more than 60 days’ prior notice mailed to each Holder of Notes to be redeemed at his address as it appears in the register, on any date prior to their stated
maturity at a Redemption Price, plus accrued and unpaid interest to the Redemption Date, equal to the greater of (i) 100% of the principal amount of such Notes to be redeemed or (ii) the sum of the present values of the remaining scheduled
payments of principal and interest thereon to be redeemed that would be due after the related Redemption Date but for such redemption (except that, if such Redemption Date is not an Interest Payment Date, the amount of the next succeeding schedule
interest payment will be reduced by the amount of interest accrued thereon to the Redemption Date), discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate (as
defined below), plus 30 basis points; provided that the principal amount of a Note remaining outstanding after redemption in part shall be $2,000 or on an integral multiple of $1,000 in excess thereof. 

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield
to maturity or interpolated maturity (computed as of the second Business Day immediately preceding such Redemption Date) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such Redemption Date. 
 “Comparable Treasury Issue” means
the United States Treasury security selected by an Independent Investment Banker that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the Notes to be redeemed. “Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Company. 

“Comparable Treasury Price” means, with respect to any Redemption Date, (i) the average of the Reference Treasury
Dealer Quotations for such Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer Quotations, or (ii) if the Trustee obtains fewer than four such Referenced Treasury Dealer Quotations, the average of all
Reference Treasury Dealer Quotations so obtained. 
 “Reference Treasury Dealer” means each of J.P. Morgan
Securities LLC, Citigroup Global Markets Inc. and their respective successors and two other nationally recognized investment banking firms that are Primary Treasury Dealers specified from time to time by the Company, except that if any of the
foregoing shall cease to be a primary U.S. government securities dealer in the United States (a “Primary Treasury Dealer”), the Company shall be required to designate as a substitute another nationally recognized investment banking
firm as Primary Treasury Dealer. 
 “Reference Treasury Dealer Quotations” means, with respect to each
Reference Treasury Dealer and any Redemption Date, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the
Trustee by such Reference Treasury Dealer at 3:30 p.m., New York City time, on the third Business Day preceding such Redemption Date. 

  
 A-1-5

 In the event of redemption of this Note in part only, a new Note or Notes of this series and
of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof. 

On and after any Redemption Date, interest will cease to accrue on the Notes called for redemption. Prior to any Redemption Date, the
Company shall deposit with the Paying Agent money sufficient to pay the Redemption Price of and accrued interest on the Notes to be redeemed on such date. If the Company is redeeming less than all of the Notes, the Trustee shall select the Notes to
be redeemed by such method as the Trustee deems fair and appropriate in accordance with methods generally used at the time of selection by fiduciaries in similar circumstances. 

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Note and certain restrictive covenants
and Events of Default with respect to this Note, in each case upon compliance with certain conditions set forth in the Indenture. 
 If an Event of Default with respect to Notes of this series shall occur and be continuing, the principal of the Notes of this series may be declared due and payable in the manner and with the effect
provided in the Indenture. 
 Subject to certain exceptions, the Indenture or the Notes of any series thereunder may be amended
or supplemented with the consent of the Holders of at least 66-2/3% in principal amount of the outstanding Notes of each series to be affected, and compliance in a particular instance with any provisions may be waived with the consent of the Holders
of a majority in principal amount of the Notes of each series affected. Without the consent of any Holder, the Indenture or this Note may be amended or supplemented to: (i) cure any ambiguity, omission, defect or inconsistency or make other
formal changes, (ii) to comply with Article Four or Five of the Indenture, (iii) to provide for uncertificated Notes in addition to or in place of certificated Notes, (iv) to add to the covenants of the Company or to add any
additional Events of Default for the benefit of all or any series of Notes, (v) to provide for the issuance of Notes in bearer form and/or coupon form, (vi) to add or change any provisions of the Indenture necessary to provide for or
facilitate the administration of the trusts under the Indenture by more than one Trustee, (vii) to establish the form or terms of the Notes of any series pursuant to Section 2.01 of the Indenture, or (viii) to make any change that
does not adversely affect the rights of any Holder, provided that, none of such changes shall adversely affect the rights of any Holder. 
 As provided in and subject to the provisions of the Indenture, the Holder of this Note may pursue a remedy with respect to the Indenture or this Note only if (i) the Holder gives to the Trustee
written notice of a continuing Event of Default; (ii) the Holders of at least 25% in principal amount of the outstanding Notes of that series make a written request to the Trustee to pursue the remedy; (iii) such Holder or Holders offer to
the Trustee indemnity satisfactory to the Trustee against any loss, liability or expense; (iv) the Trustee does not comply with the request within 60 days after receipt of the request and the offer of indemnity; and (v) during such 60-day
period the Holders of a majority in principal amount of the outstanding Notes of that series do not give the Trustee a direction inconsistent with the request. The foregoing shall not apply to any suit instituted by the Holder of this Note for the
enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein. 

  
 A-1-6

 No reference herein to the Indenture and no provision of this Note or of the Indenture shall
alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Note at the times, place and rate, and in the currency, herein prescribed. 

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the
Registrar’s books, upon surrender of this Note for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Note are payable, duly endorsed by, or accompanied by a
written instrument of transfer in form satisfactory to the Company and the Registrar duly executed by, the Holder hereof or the Holder’s attorney duly authorized in writing, and thereupon one or more new of this series and of like tenor, of
authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. 
 The Notes of this series are issuable only in registered form in denominations of $2,000 and any integral multiple of $1,000 thereof. As provided in the Indenture and subject to certain limitations
therein set forth, Notes of this series are exchangeable for a like aggregate principal amount of Notes of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same. 

No service charge shall be made to a Holder for any such registration of transfer or exchange, but the Company may require payment of a
sum sufficient to cover any tax or other governmental charge payable in connection therewith. 
 Prior to due presentment of
this Note for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and
neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 
 All terms used in this Note
which are defined in the Indenture shall have the meanings assigned to them in the Indenture. 

  
 A-1-7

 ANNEX A-2 
 THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY (AS DEFINED IN THE INDENTURE) OR A NOMINEE OF THE DEPOSITORY.
THIS GLOBAL SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF ANY PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE AND IN
PART FOR SECURITIES IN DEFINITIVE FORM, MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH
NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY. 
 UNLESS THIS CERTIFICATE IS PRESENTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME
OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE
OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN. 
 CABOT CORPORATION 
 3.70% Notes due 2022 

 

			
	No.         	  	CUSIP NO. 127055 AH4
		  	$                         

 Cabot Corporation, a corporation duly incorporated and subsisting under the laws of the State of Delaware
(herein called the “Company”, which term includes any successor corporation under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of
            MILLION U.S. Dollars (U.S. $             ) on July 15, 2022 and to pay interest thereon from July 12, 2012
or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on January 15 and July 15 in each year, commencing January 15, 2013, at the rate of 3.70% per annum, until the
principal hereof is paid or made available for payment. 
 The interest so payable, and punctually paid or duly provided for, on
any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Note (or one or more predecessor securities) is registered at the close of business on the regular record date for such interest, which shall be
the January 1 or July 1 (whether or not a Business Day), as 

  
 A-2-1

 
the case may be, next preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such regular record
date and may either be paid to the Person in whose name this Note (or one or more predecessor securities) is registered at the close of business on a special record date for the payment of such defaulted interest to be fixed by the Trustee, notice
whereof shall be given to Holders of Notes of this series not less than 5 days prior to such special record date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes
of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. 
 Payment of the principal of (and premium, if any) and interest on this Note shall be made at the office or agency of the Trustee maintained for that purpose in New York, New York, in such currency of the
United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, for so long as the Notes are represented in global form by one or more Global Securities, all payments of
principal (and premium, if any) and interest shall be made by wire transfer of immediately available funds to the Depository or its nominee, as the case may be, as the registered owner of the Global Security representing such Notes. In the event
that definitive Notes shall have been issued, all payments of principal (and premium, if any) and interest shall be made by wire transfer of immediately available funds to the accounts of the registered Holders thereof; provided, that the
Company may at its option pay interest by check to the registered address of each Holder of a definitive Note. 
 Reference is
hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place. 

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature,
this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 

  
 A-2-2

 IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its
corporate seal. 
  

			
	CABOT CORPORATION
		
	By: 	 	 
		 	Name:
		 	Title:
	
	[Seal]
		
	By: 	 	 
		 	Name:
		 	Title:

 This is one of the Securities of the series designated therein issued under the within mentioned
Indenture. 
  

			
	 U.S. BANK NATIONAL ASSOCIATION,
   as Trustee

		
	By: 	 	 
		 	Name:
		 	Title:

  
 A-2-3

 [Form of Reverse of 2022 Note] 

This Note is one of a duly authorized issue of securities of the Company (herein called the “Notes”), issued and to be
issued in one or more series under an Indenture, dated as of September 21, 2009 (herein called the “Base Indenture”, which term shall have the meaning assigned to it in such instrument), as supplemented by a Second Supplemental
Indenture, dated as of July 12, 2012 (herein called the “Second Supplemental Indenture”, and together with the Base Indenture, the “Indenture”), between the Company and U.S. Bank National Association, as
Trustee (herein called the “Trustee”, which term includes any successor trustee under the Indenture), and reference is hereby made to the Indenture for a statement of the respective rights, limitations of rights, obligations, duties
and immunities thereunder of the Company, the Trustee and the Holders of the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof, initially limited
in aggregate principal amount to $350,000,000. The Company may at any time issue additional securities under the Indenture in unlimited amounts having the same terms as the Notes so that such additional securities shall be consolidated with the
Notes, including for purposes of voting and redemption; provided that no additional securities of a series may be issued if an Event of Default has occurred and is continuing with respect to such series of securities. Any such additional
securities shall, together with the outstanding Notes, constitute a single series of debt securities under the Indenture. 
 The
Notes of this series are subject to a special mandatory redemption feature. Within five Business Days following the earlier of (a) the date on which an Acquisition Termination Event occurs and (b) 5:00 p.m. (New York City time) on
December 31, 2012, if the Norit Acquisition has not closed by such date, the Company shall be required to mail a notice of mandatory redemption to the Holders of the Notes of this series fixing the date of such mandatory redemption (such date
to be 30 days from the mailing of the notice of mandatory redemption) (the “Special Mandatory Redemption Date”). On such Special Mandatory Redemption Date, the Company shall be required to redeem the Notes of such series, in whole
but not in part, at a redemption price equal to 101% of the aggregate principal amount of the Notes, plus accrued and unpaid interest on the Notes to the Special Mandatory Redemption Date. 

“Acquisition Agreement” means the signing protocol letter agreement entered into between the Company and N Beta
S.à r.l. (the “Seller”), dated June 21, 2012 and the Agreement for the Sale and Purchase of the Entire Issued Share Capital of Norit N.V. among the Company, the Seller and Norit attached to such letter agreement as
Schedule 1. 
 “Acquisition Termination Event” means either (1) the Acquisition Agreement being rescinded
or terminated or (2) the Company determines in its reasonable judgment that the Acquisition will not occur. 

“Norit Acquisition” means the proposed acquisition by the Company of all of the issued and outstanding equity interests
of Norit N.V., a Dutch public limited liability company (naamloze vennootschap) (“Norit”). 

  
 A-2-4

 The Notes of this series are also subject to redemption, at the option of the Company, at
any time and from time to time, in whole or in part, upon not less than 30 nor more than 60 days’ prior notice mailed to each Holder of Notes to be redeemed at his address as it appears in the register, on any date prior to their stated
maturity at a Redemption Price, plus accrued and unpaid interest to the Redemption Date, equal to the greater of (i) 100% of the principal amount of such Notes to be redeemed or (ii) the sum of the present values of the remaining scheduled
payments of principal and interest thereon to be redeemed that would be due after the related Redemption Date but for such redemption (except that, if such Redemption Date is not an Interest Payment Date, the amount of the next succeeding schedule
interest payment will be reduced by the amount of interest accrued thereon to the Redemption Date), discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate (as
defined below), plus 35 basis points; provided that the principal amount of a Note remaining outstanding after redemption in part shall be $2,000 or on an integral multiple of $1,000 in excess thereof. 

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield
to maturity or interpolated maturity (computed as of the second Business Day immediately preceding such Redemption Date) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such Redemption Date. 
 “Comparable Treasury Issue” means
the United States Treasury security selected by an Independent Investment Banker that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the Notes to be redeemed. “Independent Investment Banker” means one of the Reference Treasury Dealers appointed by the Company. 

“Comparable Treasury Price” means, with respect to any Redemption Date, (i) the average of the Reference Treasury
Dealer Quotations for such Redemption Date, after excluding the highest and lowest of such Reference Treasury Dealer Quotations, or (ii) if the Trustee obtains fewer than four such Referenced Treasury Dealer Quotations, the average of all
Reference Treasury Dealer Quotations so obtained. 
 “Reference Treasury Dealer” means each of J.P. Morgan
Securities LLC, Citigroup Global Markets Inc. and their respective successors and two other nationally recognized investment banking firms that are Primary Treasury Dealers specified from time to time by the Company, except that if any of the
foregoing shall cease to be a primary U.S. government securities dealer in the United States (a “Primary Treasury Dealer”), the Company shall be required to designate as a substitute another nationally recognized investment banking
firm as Primary Treasury Dealer. 
 “Reference Treasury Dealer Quotations” means, with respect to each
Reference Treasury Dealer and any Redemption Date, the average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the
Trustee by such Reference Treasury Dealer at 3:30 p.m., New York City time, on the third Business Day preceding such Redemption Date. 

  
 A-2-5

 In the event of redemption of this Note in part only, a new Note or Notes of this series and
of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof. 

On and after any Redemption Date, interest will cease to accrue on the Notes called for redemption. Prior to any Redemption Date, the
Company shall deposit with the Paying Agent money sufficient to pay the Redemption Price of and accrued interest on the Notes to be redeemed on such date. If the Company is redeeming less than all of the Notes, the Trustee shall select the Notes to
be redeemed by such method as the Trustee deems fair and appropriate in accordance with methods generally used at the time of selection by fiduciaries in similar circumstances. 

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Note and certain restrictive covenants
and Events of Default with respect to this Note, in each case upon compliance with certain conditions set forth in the Indenture. 
 If an Event of Default with respect to Notes of this series shall occur and be continuing, the principal of the Notes of this series may be declared due and payable in the manner and with the effect
provided in the Indenture. 
 Subject to certain exceptions, the Indenture or the Notes of any series thereunder may be amended
or supplemented with the consent of the Holders of at least 66-2/3% in principal amount of the outstanding Notes of each series to be affected, and compliance in a particular instance with any provisions may be waived with the consent of the Holders
of a majority in principal amount of the Notes of each series affected. Without the consent of any Holder, the Indenture or this Note may be amended or supplemented to: (i) cure any ambiguity, omission, defect or inconsistency or make other
formal changes, (ii) to comply with Article Four or Five of the Indenture, (iii) to provide for uncertificated Notes in addition to or in place of certificated Notes, (iv) to add to the covenants of the Company or to add any
additional Events of Default for the benefit of all or any series of Notes, (v) to provide for the issuance of Notes in bearer form and/or coupon form, (vi) to add or change any provisions of the Indenture necessary to provide for or
facilitate the administration of the trusts under the Indenture by more than one Trustee, (vii) to establish the form or terms of the Notes of any series pursuant to Section 2.01 of the Indenture, or (viii) to make any change that
does not adversely affect the rights of any Holder, provided that, none of such changes shall adversely affect the rights of any Holder. 
 As provided in and subject to the provisions of the Indenture, the Holder of this Note may pursue a remedy with respect to the Indenture or this Note only if (i) the Holder gives to the Trustee
written notice of a continuing Event of Default; (ii) the Holders of at least 25% in principal amount of the outstanding Notes of that series make a written request to the Trustee to pursue the remedy; (iii) such Holder or Holders offer to
the Trustee indemnity satisfactory to the Trustee against any loss, liability or expense; (iv) the Trustee does not comply with the request within 60 days after receipt of the request and the offer of indemnity; and (v) during such 60-day
period the Holders of a majority in principal amount of the outstanding Notes of that series do not give the Trustee a direction inconsistent with the request. The foregoing shall not apply to any suit instituted by the Holder of this Note for the
enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein. 

  
 A-2-6

 No reference herein to the Indenture and no provision of this Note or of the Indenture shall
alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Note at the times, place and rate, and in the currency, herein prescribed. 

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Note is registrable in the
Registrar’s books, upon surrender of this Note for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Note are payable, duly endorsed by, or accompanied by a
written instrument of transfer in form satisfactory to the Company and the Registrar duly executed by, the Holder hereof or the Holder’s attorney duly authorized in writing, and thereupon one or more new of this series and of like tenor, of
authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. 
 The Notes of this series are issuable only in registered form in denominations of $2,000 and any integral multiple of $1,000 thereof. As provided in the Indenture and subject to certain limitations
therein set forth, Notes of this series are exchangeable for a like aggregate principal amount of Notes of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same. 

No service charge shall be made to a Holder for any such registration of transfer or exchange, but the Company may require payment of a
sum sufficient to cover any tax or other governmental charge payable in connection therewith. 
 Prior to due presentment of
this Note for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and
neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 
 All terms used in this Note
which are defined in the Indenture shall have the meanings assigned to them in the Indenture. 

  
 A-2-7

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