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Gel migration is measured using a quantitative internal method * 6151 can be supplied with UV protection * Values concluded from the simulation of materials rheological data and modelling standard extrusion tooling Pressure: can affect extruder performance, higher pressure gives a lower output at the same rpm Shear rate: has a relation with self-cleaning of the walls and mixing conditions Stress: can affect the surface of the product, less stress gives a better surface aspect MIGRATION OF GEL COMPOUND Gel Compound ECCOH™ 6151* ECCOH™ 6153 UV ECCOH™ 6154 UV Unigel Average Good Excellent Teroson Average Excellent Good Itcogel Average Good Excellent ECCOH™ 6151 ECCOH™ 6153 UV ECCOH™ 6154 UV ∆P (bars) 101 63 60 Shear Rate (1/s) 9 9 9 Stress (kPa) 127 79 75 Application example: Gel-filled stranded loose tube optical fiber cable www.avient.com Copyright © 2020, Avient Corporation.

Reconciliation to Adjusted EPS Excluding Special Items and Impacts of February 2020 Equity Offering Three Months Ended March 31, 2020 Net income from continuing operations – GAAP $ 33.1 Special items, after tax (1) 8.6 After tax interest income earned on equity proceeds, included in Interest expense, net (0.7) Adjusted net income excluding special items and impact of interest income on equity proceeds $ 41.0 Diluted weighted-average shares used to compute earnings per common share 86.7 Weighted-average impact of 15.3 million shares issued in February 2020 equity offering (9.3) Diluted weighted-average shares excluding impact of shares issued in February 2020 equity offering 77.4 Adjusted EPS - excluding special items and the net impact of equity offering $ 0.53 Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to PolyOne shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to PolyOne shareholders, excluding special items, to assess performance and facilitate comparability of results.

Reconciliation to Adjusted EPS Excluding Special Items and Impacts of February 2020 Equity Offering Three Months Ended March 31, 2020 Net income from continuing operations – GAAP $ 33.1 Special items, after tax (1) 8.6 After tax interest income earned on equity proceeds, included in Interest expense, net (0.7) Adjusted net income excluding special items and impact of interest income on equity proceeds $ 41.0 Diluted weighted-average shares used to compute earnings per common share 86.7 Weighted-average impact of 15.3 million shares issued in February 2020 equity offering (9.3) Diluted weighted-average shares excluding impact of shares issued in February 2020 equity offering 77.4 Adjusted EPS - excluding special items and the net impact of equity offering $ 0.53 Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to PolyOne shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to PolyOne shareholders, excluding special items, to assess performance and facilitate comparability of results.

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Technical Data Sheets Safety Data Sheets Safety Data Sheets

Safety Data Sheets Important information about the health, safety and environmental impacts of Avient products. Safety Data Sheets

Sanders spent over 20 years at 3M Company with various roles of increasing responsibility, culminating as senior vice president and deputy general counsel supporting global business operations for all segments and manufacturing operations.

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.