PolyOne Strand Coat Base

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatch joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe.

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe.

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe.

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joint together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe. 

At K 2016, Avient exhibited under its former name, PolyOne.

It’s in this spirit that we joined legacy PolyOne and the Clariant Masterbatch business, two complementary businesses, and formed a new one that we’ve named Avient. We are better together through: Keeping Safety First — PolyOne and Clariant are both ACC Responsible Care® companies, and nothing is more important than the health, safety and well-being of our people. Leading in Sustainability — PolyOne and Clariant are both founding members of the Alliance to End Plastic Waste, and we are committed to meeting the needs of the present without compromising the ability of future generations to do the same.

It’s in this spirit that we joined legacy PolyOne and the Clariant Color business, two complementary businesses, and formed a new one that we’ve named Avient. We are better together through: Keeping Safety First — PolyOne and Clariant are both ACC Responsible Care® companies, and nothing is more important than the health, safety and well-being of our people. Leading in Sustainability — PolyOne and Clariant are both founding members of the Alliance to End Plastic Waste, and we are committed to meeting the needs of the present without compromising the ability of future generations to do the same.

Avient was formed as PolyOne Corporation on August 31, 2000 from the consolidation of The Geon Company (Geon) and M.A. Wulfsohn 73 AVIENT CORPORATION Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the following Registration Statements: (1) Registration Statement (Form S-8 No. 333-238246) pertaining to the PolyOne Corporation 2020 Equity and Incentive Compensation Plan; (2) Registration Statement (Form S-8 No. 333-231236) pertaining to the PolyOne Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014); (3) Registration Statement (Form S-8 No. 333-217879) pertaining to the PolyOne Corporation 2017 Equity and Incentive Compensation Plan; (4) Registration Statement (Form S-8 No. 333-205919) pertaining to the Amended and Restated PolyOne Corporation 2010 Equity and Performance Incentive Plan; (5) Registration Statement (Form S-8 No. 333-181787) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; (6) Registration Statement (Form S-8 No. 333-166775) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; (7) Registration Statement (Form S-8 No. 333-157486) pertaining to the PolyOne Retirement Savings Plan; (8) Registration Statement (Form S-8 No. 333-47796) pertaining to Post-Effective Amendment No. 3 on Form S-8 to Form S-4 pertaining to the Geon Company 1993 Incentive Stock Plan, the Geon Company 1995 Incentive Stock Plan, the Geon Company 1998 Interim Stock Award Plan, the Geon Company 1999 Incentive Stock Plan, the PolyOne Corporation Deferred Compensation Plan for Non-Employee Directors and the M.A. Hanna Company Long-Term Incentive Plan; (9) Registration Statement (Form S-8 No. 333-141029) pertaining to the PolyOne Retirement Savings Plan and the DH Compounding Company Savings and Retirement Plan and Trust; and (10) Registration Statement (Form S-3 No. 333-236116) of PolyOne Corporation of our reports dated February 22, 2022, with respect to the consolidated financial statements of Avient Corporation and the effectiveness of internal control over financial reporting of Avient Corporation, included in this Annual Report (Form 10-K) of Avient Corporation for the year ended December 31, 2021.

Annex 2 – ISO 22000 certifications Avient Colorants Spain S.A, Avient Colorants Santa Clara Coatitla Mexico, and PolyOne Spain SLU have enhanced systems to support food packaging applications with an external ISO 22000 certification adding the following core processes: Change All changes concerning any product produced under ISO 22000 conditions are evaluated to determine whether there will be any impact the Supplier approval and supplier evaluation specification or in the quality of the product. . HACCP Avient Colorants Spain S.A., Avient Colorants Toluca Mexico, and PolyOne Spain SLU follow the structure of HACCP (Hazard Analysis and Critical Control Point) as a system for assessing compliance to food safety standards.