MSC Certificate Place and date: For the issuing office: Shanghai, 20 March 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 1614-2000-AE-RGC-RvA Initial certification date: 23 May 2000 Valid: 24 May 2024 – 23 May 2027 This is to certify that the management system of PolyOne-Shanghai, China No. 88, Guo Shou Jing Road, Z. Park, China (Shanghai) Pilot Free Trade Zone, Shanghai, China 201203 has been found to conform to the Environmental Management System standard: ISO 14001:2015 This certificate is valid for the following scope: Design and Manufacture of Colour and Additive Concentrates http://www.dnv.com/assurance

MSC Certificate Place and date: For the issuing office: Høvik, 23 January 2025 DNV Product Assurance AS Veritasveien 1, 1363 Høvik, Norway Cecilie Gudesen Torp Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ICP-4-5-i5-ISO13485-f1 rev2 ACCREDITED UNIT: DNV Product Assurance AS, Veritasveien 1, 1363 Høvik, Norway - TEL: +47 67 57 99 00. www.dnv.com MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 240625-2017-AQ-RGC-NA-PS Initial certification date: 14 September 2017 Valid: 08 February 2025 – 07 February 2028 This is to certify that the management system of PolyOne-Shanghai, China 88 Guoshoujing Road, Z.J.Hi-Tech Park, Pudong Shanghai, China (Unicode: 91310000607342402D) has been found to conform to the Quality Management System standard: ISO 13485:2016 This certificate is valid for the following scope: Design, Manufacture, Sales and Distribution of Medical Colour and Additive Concentrates Used for the Plastic Parts of Medical Devices http://www.dnv.com

Certificate of Registration 9001:2015 MSP 9001:2015–MSP-ANAB-US (2.0) Page 1 of 2 Certificate of Registration of Quality Management System to ISO 9001:2015 The National Standards Authority of Ireland certifies that: Colorant Chromatics Ab Kroklundsvagen 346 AX-22 320 Odkarby Aland Finland has been assessed and deemed to comply with the requirements of the above standard in respect of the scope of operations given below: The Design, Manufacture and Sales of Fluoropolymer Color Concentrates and Compounds Additional sites covered under this multi-site certification are listed on the Annex (File No. 19.2540/C) Approved by: Geraldine LarkinChief Executive Officer Approved by: Lisa Greenleaf Operations Manager Registration Number: 19.2540/C Certification Granted: May 15, 1997 Effective Date: Oct 20, 2018 Expiry Date: Oct 19, 2021 National Standards Authority of Ireland, 20 Trafalgar Square, Nashua, New Hampshire, NH 03063, USA T +1 603 882 4412 9001:2015–MSP-ANAB-US (2.0) Page 2 of 2 Annex to Certificate Number: 19.2540/C Scope of Registration: The Design, Manufacture and Sales of Fluoropolymer Color Concentrates and Compounds Activity Location Central Management Group, Design, Manufacture Colorant Chromatics Kroklundsvagen 346 AX-22 320 Odkarby Aland Finland File No.: 19.2540/C Headquarters, Sales, Distribution Colorant Chromatics Europe B.V.

Certification awarded to Avient Protective Materials Urmonderbaan 22 6167 RD Geteen The Netherlands This is a multisite certificate. Standard ISO 900 1:2O15 Scope of supply c II +t U t-r- '.F t- () (n rU '- c) l cu q) t_ l m Design, development, marketing & sales and related application support of UHMWPE, Ultra-High-Motecutar-Weight PolyEthytene fibers and UniDirecfionat sheets. Standard ISO 900 1:2015 Scope of suppty Version: 1 Revision date: 06 March 2024 Kerbusch - Director Certification Benelux Managing office: Bureau veritas lnspecLion and certification The Nethertan

This is to certify that Fiber-Line, LLC 280 Performance Drive SE, Hickory, North Carolina 28602 USA Quality Management System ISO 9001:2015 Manufacture of textile components to cable manufacturers. Certificate No.: CERT-0116814 Original Certification Date: November 24, 2010 File No.: 1616267 Certification Effective Date: April 1, 2021 Issue Date: March 30, 2021 Certificate Expiry Date: March 31, 2024 ________________________________________________________________________________ ISO 9001 Registered by: QMI-SAI Canada Limited (SAI Global), 20 Carlson Court, Suite 200, Toronto, Ontario M9W 7K6 Canada. This registration is subject to the SAI Global Terms and Conditions for Certification.

SKZ Standart-Dokumentvorlage This certificate is valid from: 23.05.2024 bis: 19.05.2027 Certificate No.: 000870.E/24.R Würzburg, 23.05.2024 Benjamin Kirchgeßner Certification Body Certificate The SKZ - Cert GmbH certifies to the company Avient Th. Bergmann GmbH Adolf-Dambach-Str. 2-4 76571 Gaggenau the introduction and application of a management system according to ISO 50001:2018 scope: Delelopment and production of technical Polymers; at the sites according to appendix. This certificate is valid from: 23.05.2024 bis: 19.05.2027 Certificate No.: 000870.E/24.R Würzburg, 23.05.2024 Benjamin Kirchgeßner Certification Body Appendix to certification number: 000870.E/24.R Avient Th.

Robert Schmitt Certification Body This certificate is valid from: 20.05.2021 to: 19.05.2024 Certificate No.: 000461.1.E/21.R This is a sub-certificate of the PolyOne Deutschland GmbH, Certificate No.: 000461.E/21.R. Certificate The SKZ-Cert GmbH Zertifizierungen certifies to the company PolyOne Th. Bergmann GmbH Adolf-Dambach-Str. 2-4 76571 Gaggenau the introduction and application of a management system according to ISO 50001:2018 Scope: DEVELOPMENT AND PRODUCTION OF TECHNICAL POLYMERS The proof has been furnished by an audit.

GenericCertificate_NewLayout Certificate TH04/3852 The management system of Avient (Thailand) Co., Ltd. 79 Moo 11, Soi Kingthong, Kingkaew Road, Rachatewa, Bangplee, Samutprakarn, 10540, Thailand This document is an authentic electronic certificate for Client’ business purposes use only. Printed version of the electronic certificate are permitted and will be considered as a copy. Page 1 / 1 has been assessed and certified as meeting the requirements of ISO 9001:2015 For the following activities The Design and Manufacturing of Plastic Color Concentrated, Plastic Additive Concentrated and Pigment Powder for Thermoplastic & Rubber Industries.

Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. ISO 9001:2015 The Quality Management System is applicable to: Certificate No: 47804 Certification Date: 07 January 2013 Effective Date: 17 December 2018 Expiration Date: 06 January 2022 Issue Date: 17 December 2018 Alex Weisselberg, President This certificate may be found on the ABS QE Website (www.abs-qe.com). For certificates issued in the People's Republic of China information may also be verified on the CNCA website (www.cnca.gov.cn).

Additionally, Avient’s ISO 13485 manufacturing site in Singapore for its Mevopur™ formulations recently achieved ISO/IEC 17025 accreditation for Biological Evaluation of Medical Devices–Part 5: Tests for In-Vitro Cytotoxicity.  Mevopur™ Healthcare Colorants and Functional Additives: formulations pre-tested to support compliance with regulatory requirements, such as USP Class VI, ISO 10993, EP3.1, USP661.1, and ICH Q3D and manufactured across a global network of ISO 13485-certified facilities or under GMP certifications. PCF values are available for these products and are based upon a TUV-certified ISO-14067: 2018 process.