PLATINUM REGISTRATION INC. 1040 South Gaylord Street, Suite 71, Denver, CO 80209 www.platinumregistration.com | info@platinumregistration.com Polystrand, Inc. 8375 Highfield Parkway, Englewood, CO, 80112 Is certified by PLATINUM REGISTRATION as a company that has developed, implemented and maintains a quality management system that conforms to the requirements of the following International Standards: ISO 9001:2015 (Requirements not applicable:8.5.5 Post-delivery activities.)

This document is issued by the Company subject to SGS General Conditions of certification services available on Terms and Conditions | SGS.

Midea joined Avient in February 2015 and leads the company’s award-winning global operational excellence initiatives, including manufacturing process improvement, environmental health and safety, global sourcing and logistics, Lean Six Sigma training and deployment, and acquisition integration.

Kronimus joined Avient in March 1999, and in addition to leading the company’s engineered materials business in Europe and India, also serves as Avient’s legal representative in the region, responsible for building and maintaining relationships with local governments and associations.

In other roles with the company, Ms.

He joined Avient in 2010 and has since delivered success in multiple positions throughout the company thereafter.

PROHIBITED USES OF INFORMATION SYSTEMS Users shall not use Avient Information Systems for any of the following prohibited uses: • Any activity prohibited by applicable law; • Violating Avient Ethics and Corporate Policies; • Infringing on the intellectual property rights of another individual or company; • Soliciting for activities or products unrelated to Avient’s business interests in furtherance of an independent business; • Improper or unauthorized use of email and email distribution lists, including mass or unsolicited emails (such as chain letters) and forging email header information or signatures; • Exporting, transferring, downloading, copying, or saving Confidential Data or Information Systems to non-approved devices or locations; • Intentionally introducing security threats to Information Systems or effecting a Cyber or Data Incident; or • Engaging in any other activity similar to the above that, in Avient’s reasonable judgment, is disruptive to or not in the best interests of its business. ENFORCEMENT AND MONITORING Authorized individuals within Avient IT may monitor or audit Information Systems use, whether company or personal, including, without limitation, Internet traffic and e-mail content, at any time and without prior notice to the User. http://polynet/ethics/Portals/23/documents/Cyber%20and%20Data%20Incident%20Response%20Policy/Cyber_Incident_Response_Policy-September%202018_EN%20-%20v1.pdf http://polynet/ethics/Portals/23/documents/Cyber%20and%20Data%20Incident%20Response%20Policy/Cyber_Incident_Response_Policy-September%202018_EN%20-%20v1.pdf Confidential 6 Avient IT Department Information Systems Use Policy September 1, 2021 APPENDIX A: DEFINITIONS In addition to those terms defined within the body of this Policy, the following definitions are used: “Avient Data” – includes (a) all data and information generated, stored, collected, or processed by Avient through Information Systems; (b) all information under the control of Avient and originating from, belonging to, or received from customers, suppliers, or third parties; (c) all data and information regarding intellectual property of Avient; and (d) purely intra-Avient information connected to individual employees, such as Information System usernames, passwords, and company ID.

Each of such adjustments has not yet occurred, are out of the Company's control and/or cannot be reasonably predicted. For the same reasons, the Company is unable to address the probable significance of the unavailable information. To provide comparable financial results, the Company references “pro forma” financial metrics, which include the business results of CMB for periods prior to the Acquisition Date.

Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. GUIDANCE (TOTAL COMPANY PRO FORMA) $100 $107 Guidance Pro Forma $0.33 $0.42 Guidance Pro Forma Adjusted EBITDA Adjusted EPS (in millions) $200 $293 Guidance Actual Free Cash Flow (in millions) FY 2022 VS. The presentation of these measures may be different from non-GAAP financial measures used by other companies.

12950 Worldgate Drive, Suite 800, Herndon, VA 20170-6007 USA A Member of the BSI Group of Companies. Americas Headquarters: BSI Group America Inc., 12950 Worldgate Drive, Suite 800, Herndon, VA 20170-6007 USA A Member of the BSI Group of Companies.