CERTIFICATE Signed for the certification body: Eric Louys Chairman Certification Committee CERTIFICATE EN ISO 50001 : 2018 Energy Management System VINÇOTTE nv Jan Olieslagerslaan 35, 1800 Vilvoorde, Belgium This is to certify that Avient Located at Rue Melville Wilson 2 5330 Assesse Belgium has established and maintains an energy management system according the requirements of EN ISO 50001 : 2018 “Energy Management System” for: Design and manufacture of colour and additive concentrates, thermoplastic resins and speciality compounds This certificate is based on the result of an energy audit documented in the audit report 61231731.

Satisfied USP Class VI regulatory requirements for skin contact • Delivered a series of soft-touch TPEs capable of meeting the desired feel • Eased production of buckle design with injection moldable solutions Versaflex CL TPEs WHY AVIENT?

Hygiene fiber manufacturer HYGIENE FIBER MANUFACTURER P P N O N W O V E N M U L T I L A Y E R S • Meet FDA requirements specified by the customer • Provide technical support including specific color, processing and molding recommendations • Deliver the brighter white colorants to make the final product look whiter and cleaner • Developed an FDA colorant to meet customer regulatory specifications • Provided technical expertise throughout the design and manufacturing process • Offered a brighter white color for the final product Remafin Fiber Colorants for PP KEY REQUIREMENTS WHY AVIENT?

Appliance Manufacturer APPLIANCE MANUFACTURER P U S H B U T T O N S • Non-halogen to industry standards • Lower density • Good impact properties • Easy to process • High aesthetics • Provided a non-halogenated solution while improving the performance of the formerly used halogenated grade • Supported the project with various expertise in design, regulatory and technical support • Helped to reduce the system cost and make our customer more competitive in the market Maxxam NHFR Non-Halogen Flame Retardant Polyolefin Formulation KEY REQUIREMENTS WHY AVIENT?

They are based on management’s expectations that involve a number of business risks and uncertainties, any of which could cause actual results to differ materially from those expressed in or implied by the forward-looking statements. 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. To provide comparable results, the company references “pro forma” financial metrics, which include the business results of Avient Protective Materials for periods prior to the Acquisition Date, as if the transaction occurred on January 1, 2021 and reflect Distribution as a discontinued operation.

Any samples or developmental material provided by Seller are provided “AS IS” with no warranty as to its performance and such samples or materials shall not create any warranty by sample, which is hereby waived. The sale of Products or the providing of samples or developmental material shall not, by implication or otherwise, convey any license under any intellectual property right relating to the compositions and/or applications of the Products, sample, or developmental material, as applicable. Buyer shall not use Seller’s name or trademarks in any advertisements, product descriptions, packaging materials, websites, or any other promotional materials, except with the prior written consent of Seller. 20.

Avient is an intermediate supplier of specialty polymers and related raw materials designed to meet the specifications of its manufacturing customers. Avient Investor Presentation Longbow Basic Materials Conference - March 2016

Any samples or develop- mental material provided by Seller are provided “AS IS” with no warranty as to its performance and such samples or materials shall not create any warranty by sample, which is hereby waived. The sale of Products or the providing of samples or develop- mental material shall not, by implication or other- wise, convey any license under any intellectual property right relating to the compositions and/or applications of the Products, sample, or develop- mental material, as applicable. Seller has no liability for the failure of discharge or unloading equipment or materials used by Buyer, whether or not supplied by Seller 12.

IATF 16949:2016 The Quality Management System is applicable to: Certificate No: 39913 Effective Date: 30 November 2017 Expiration Date: 29 November 2020 Issue Date: 30 November 2017 IATF No: 0280241 Alex Weisselberg, President DESIGN AND MANUFACTURE OF COLOR CONCENTRATES (WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations PolyOne Corporation IATF 16949:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

IATF 16949:2016 The Quality Management System is applicable to: Certificate No: 38972 Effective Date: 04 September 2018 Expiration Date: 03 September 2021 Issue Date: 31 December 2018 IATF No: 0328156 Alex Weisselberg, President DESIGN AND MANUFACTURE OF CUSTOM PVC PLASTISOL AND PVC SLUSH MOLD POWDER (WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations PolyOne Corporation IATF 16949:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.