No. 0962.01) 09/05/2023 Page 1 of 1 SCOPE OF ACCREDITATION TO ISO/IEC 17025:2017 AVIENT CORPORATION 80 North West Street Norwalk, OH 44857 Craig Polta Phone: 419 660 4278 MECHANICAL Valid To: September 30, 2025 Certificate Number: 0962.01 In recognition of the successful completion of the A2LA evaluation process, accreditation is granted to this laboratory to perform the following tests on plastics: Test Method(s) Test Name ASTM D256; ISO 180 Notched Izod ISO 179 (1eA) Determination of Charpy Impact ASTM D523 Gloss ASTM D618 (Method A) Conditioning of Test Specimens ASTM D792 (Method A) Specific Gravity ASTM D1238 (Method B) Melt Flow Rate ASTM D3012 Thermal Oxidative Stability ASTM D3641 Injection Molding Test Specimens FMVSS 302 Flammability ASTM E1331; SAE J1545 Spectrophotometric Color Difference SAE J1885 (Rev. Accredited Laboratory A2LA has accredited AVIENT CORPORATION Norwalk, OH for technical competence in the field of Mechanical Testing This laboratory is accredited in accordance with the recognized International Standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories.

AVIENT CORPORATION GROUP’S PUBLICATION OF UK TAX STRATEGY Introduction This document summarizes Avient Corporation and its worldwide affiliates’ (together “The Avient Group”) policy and approach to conducting United Kingdom (“UK”) tax affairs and managing tax risk. This document has been approved by Avient Corporation’s Vice President, Tax, and by each of the UK sub-groups owned by the Avient Group through such appropriate board of directors of the UK sub-groups.

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Schematic representation of creep mechanism; chain alignment and void formation in response to applied stress. 3© 2021 Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 There are several key factors which can influence the timeline to ESC failure: 1. List of polymers tested and identifying features. 6© 2021 Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 To assess the results of the chemical resistance testing, an ESCR criteria was developed that took into consideration a visual observation as well as the mechanical data. - - 8© 2021 Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 Table 3B.

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Rev 12-05-2023 Avient Corporation: Quality Response for Manufacturing Facilities in North America, North LATAM, Europe, the Middle East, and Africa 2 Dear Customer, This Quality Response for Manufacturing Facilities in North America, Europe, the Middle East and Africa, is being provided in response to your request to complete and return your supplier questionnaire / assessment. Our internal policies and practices often go beyond compliance as part of our continuing commitment to corporate responsibility and sustainability. Our systems have been designed to comply with applicable laws and regulations and offer robust programs for supporting our quality and corporate responsibility initiatives.