EX-10.18





 Exhibit 10.18 

COPYRIGHT SECURITY AGREEMENT, dated as of December 13, 2019 (this “Agreement”), among Nelson Laboratories, LLC (the
“Grantor”) and Jefferies Finance LLC, as collateral agent (in such capacity, the “First Lien Collateral Agent”). 

Reference is made to (a) the First Lien Credit Agreement dated as of December 13, 2019 (as amended, restated, supplemented or otherwise modified
from time to time, the “First Lien Credit Agreement”) among SOTERA HEALTH TOPCO, INC., a Delaware corporation (“Holdings”), SOTERA HEALTH HOLDINGS, LLC, a Delaware limited liability company (the
“Borrower”), the Lenders and Issuing Banks from time to time party thereto and JEFFERIES FINANCE LLC, as First Lien Administrative Agent and (b) the First Lien Collateral Agreement dated of December 13, 2019 (as amended,
restated, supplemented or otherwise modified from time to time, the “First Lien Collateral Agreement”) among the Borrower, the other Grantors from time to time party thereto, Holdings, and the First Lien Collateral Agent. The
Lenders and the Issuing Banks have agreed to extend credit to the Borrower subject to the terms and conditions set forth in the First Lien Credit Agreement. The Grantor is an Affiliate of the Borrower and is willing to execute and deliver this
Agreement in order to induce the Lenders to make additional Loans and the Issuing Banks to issue additional Letters of Credit and as consideration for Loans previously made and Letters of Credit previously issued. Accordingly, the parties hereto
agree as follows: 
 SECTION 1. Terms. Capitalized terms used in this Agreement and not otherwise defined herein have the meanings specified in the
First Lien Collateral Agreement. The rules of construction specified in Section 1.01(b) of the First Lien Collateral Agreement also apply to this Agreement. 

SECTION 2. Grant of Security Interest. As security for the payment or performance, as the case may be, in full of the Secured Obligations, the Grantor
hereby grants to the First Lien Collateral Agent, its successors and assigns, for the benefit of the Secured Parties, a security interest (the “Security Interest”) in all of such Grantor’s right, title and interest in, to and
under the United States Copyrights listed on Schedule I attached hereto (collectively, the “Copyright Collateral”). This Agreement is not to be construed as an assignment of any copyright or copyright application. 

SECTION 3. First Lien Collateral Agreement. The Grantor hereby acknowledges and affirms that the rights and remedies of the First Lien Collateral Agent
with respect to the Copyright Collateral are more fully set forth in the First Lien Collateral Agreement, the terms and provisions of which are hereby incorporated herein by reference as if fully set forth herein. In the event of any conflict
between the terms of this Agreement and the First Lien Collateral Agreement, the terms of the First Lien Collateral Agreement shall govern. 
 SECTION 4.
Termination. Subject to Section 5.13 of the First Lien Collateral Agreement, upon the occurrence of the Termination Date, the security interest granted herein shall terminate and the First Lien Collateral Agent shall execute,
acknowledge, and deliver to the Grantors all instruments in writing in recordable form to evidence and release the collateral pledge, grant, assignment, lien and security interest in the Copyright Collateral under this Agreement.













 SECTION 5. Counterparts. This Agreement may be executed in counterparts (and by different parties
hereto on different counterparts), each of which shall constitute an original but all of which when taken together shall constitute a single contract. Delivery of an executed signature page to this Agreement by facsimile or other electronic
transmission shall be effective as delivery of a manually signed counterpart of this Agreement. 
 SECTION 6. Governing Law. This Agreement shall be
construed in accordance with and governed by the laws of the State of New York. 
 [Remainder of Page Intentionally Left Blank] 

  
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 IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement as of the day and year first above
written. 
  

			
	NELSON LABORATORIES, LLC, as Grantor
		
	By	 	/s/ Scott J. Leffler
		 	Name: Scott J. Leffler
		 	Title: Chief Financial Officer & Treasurer


  

			
	JEFFERIES FINANCE LLC, as First Lien Collateral Agent


 
			
		
	By:	 	/s/ John Kennedy


 
			
	Name:	 	Jason Kennedy
	Title:	 	Managing Director


 [Signature Page to Copyright Security Agreement]