No. 0514.02) 12/11/2023 Page 1 of 1 SCOPE OF ACCREDITATION TO ISO/IEC 17025:2017 AVIENT CORPORATION – ANALYTICAL SOLUTIONS 33587 Walker Road Avon Lake, OH 44012 Stephanie Mims Phone: 440-930-3499 CHEMICAL Valid To: September 30, 2025 Certificate Number: 0514.02 In recognition of the successful completion of the A2LA evaluation process, accreditation is granted to this laboratory to perform the following rubber and plastics tests: Test Description: Test Method or Standard: FTIR (Fourier Transform Infrared) Spectroscopy ASTM E1252 (Except 7.6, 11.2, and 11.4) Flammability Horizontal Burn of Self-Supporting Plastics ASTM D635; UL 94; IEC 60695-11-10 Horizontal Burn of Materials Used in Occupant Compartments of Motor Vehicles ASTM D5132; FMVSS 302 (49 CFR 571.302); ISO 3785 Vertical Burn, 20 mm ASTM D3801; UL 94; IEC 60695-11-10 Vertical Burn, 125 mm ASTM D5048; UL 94; IEC 60695-11-20 Thin Material Burning Test UL-94 Glow Wire Test IEC 60695 2-10, 2-11, 2-12, 2-13 Thermal Analysis DSC (Differential Scanning Calorimetry) ASTM D3418, E794, E1356 TGA (Thermogravimetric Analysis) ASTM E1131 TMA (Linear Thermal Expansion of Solid Materials by Thermomechanical Analysis) ASTM E831; ISO 11359-2 Karl Fischer Moisture Content ASTM D6869 For the tests to which this accreditation applies, please refer to the laboratory’s Chemical Scope of Accreditation. Accredited Laboratory A2LA has accredited AVIENT CORPORATION – ANALYTICAL SOLUTIONS Avon Lake, OH for technical competence in the field of Chemical 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.

In addition, the cross- selling opportunities that leverage Avient’s Engineered Materials and Distribution segments will identify and deliver additional growth. Whether an additional line at an existing manufacturing plant, or a new facility in a growing region, we ramp-up quickly and cost-efficiently. 17 Capex / Revenue 2021E (%) Source: Bloomberg market data as of November 9, 2020 AVIENT IS ASSET LIGHT Avient Specialty Formulators Other Chemical/Specialty Companies 2 3 2 2 3 3 3 6 3 4 5 5 5 5 5 6 6 7 7 9 24 A v ie n t A v ie n t (E x c l. We are Avient.

Learn how Avient’s chemically compatible Versaflex™ PKG thermoplastic elastomers provide a wide range of tactile finishes and surface textures Color and Additives Solutions Overview Soft Foam Ammo for Toy

Colorant & Additive Dispersions Brochure Learn how Avient's pre-dispersed colorants and additives give you the consistency and quality your products deserve Give your silicone products a boost of color and maintain chemical standards with these specialty color dispersions

Provide durable, reliable, and easy-to-use at-home pulse oximeters and ECG monitors with chemically resistant, medically compliant thermoplastics and elastomers from Avient. With Avient’s medical-grade thermoplastic elastomers, colorants, and functional additives, you can design with the latest on-trend colors in mind and optimize material performance. Learn more about how Avient's medical-grade polymers, colorants and additives can enhance effectiveness and safety.

Avient’s chief operating decision maker uses these financial measures to monitor and evaluate the ongoing performance of Avient and each business segment and to allocate resources. Avient reflects 2023 adjusted EBITDA guidance of $500M and estimated run-rate CAPEX of $110M. 2023E (%) 27 78 89 83 80 78 74 86 79 76 67 66 55 50 (39) Av ie nt KW R FU L PP G AV Y R PM FM C C E EC L AS H H XL H U N EM N SC L Avient Specialty Formulators Other Specialty / Chemical Companies MULTIPLE EXPANSION Source: Peer data per Bloomberg as of December 29, 2023 Note: Avient reflects 2023 adjusted EBITDA guidance of $500M and closing share price of $41.57. In addition, operating income before the effect of special items is a component of Avient’s annual incentive plans and is used in debt covenant computations.

Color and Additive Concentrates Browse and download our literature to learn more about Avient solutions and services. Additives for Polyolefin Films: Cesa™

Polymer Additives Learn more about how Avient's medical-grade polymers, colorants and additives can enhance effectiveness and safety. Healthcare Additives

Avient has served the healthcare industry for decades with a full portfolio of innovative materials and services. After three days of exposure to the hospital disinfectants, a 20x magnified image was taken of each set of bars to demonstrate the effect of the chemical. Avient makes no warranties or guarantees respecting suitability of either Avient’s products or the information for your process or end-use application.

Cesa™ Nox A4R Additive for Enhanced Recycling Browse and download our literature to learn more about Avient solutions and services. Learn more about Avient's portfolio for recycled resins used in electrical and electronic applications.