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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. Presented this 05th day of September 2023. _______________________ Mr. Trace McInturff, Vice President, Accreditation Services For the Accreditation Council Certificate Number 0962.01 Valid to September 30, 2025

GUIDANCE 6 $845 $846 $125 $134 Sales Adjusted EBITDA (in millions) $0.55 $0.63 Adjusted EPS (in millions) Q1 2023 PERFORMANCE VS. Avient reflects 2023 adjusted EBITDA guidance of $530M and estimated run-rate CAPEX of $110M. Avient Specialty Other Specialty / 2023E(%) 32 79 87 83 81 76 73 90 79 77 76 73 69 60 22 MULTIPLE EXPANSION Avient Specialty Other Specialty / Note: Avient reflects 2023 adjusted EBITDA guidance of $530M and closing share price of $38.51.

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March 30, 2021 LUXEMBOURG – March 30, 2021 – Avient today announced global expansion of its reSound™ R recycled-content thermoplastic elastomer (TPE) range. The grade contains 30 percent PIR content at 80 Shore A hardness and is compatible with consumer electronics applications such as phone cases.  

2200051B VBX3523 BK PWD MOLD RELEASE B 2200051A VBX3523 BK PWD MOLD RELEASE A

5-BK-80 PP BLACK MASTERBATCH - AQP PP-8027 BK PP

6-BK-40 BLACK EVA CONCENTRATE 65-BK-20 BLACK TPU CONCENTRATE

PG 111564.05 BK PP PG 111564.06 BK PP