Figure 4 shows a top and side view of a corner with constant wall thickness where coring has been applied. Wall Thickness (mm) C o o li n g T im e ( S e c ) 40 35 30 25 20 15 10 5 0 0 1 2 3 4 ABS PC Nylon 6/6 FIGURE 1 - Wall thickness vs. cooling time of various plastics FIGURE 2 - Designing for wall thickness changes FIGURE 3 - Internal and external radius guidelines FIGURE 4 - Coring for tight radius design ESCR Design Guide 2 CONTOUR Where possible, contouring the products’ exterior form, as shown in Figure 5, can help to eliminate pooling of fluids. The heat will melt the plastic around FIGURE 9 - Proper boss design FIGURE 10 - Boss design guidelines ESCR Design Guide 4 it, allowing the plastic to relax, reflow, and solidify.

Date Of Certification: 11 December 2024 Date Of Expiration: 10 December 2027 IATF Certificate N°: 0558656 Bureau Veritas Certification Certificate No: FR094003 - IATF Revision: 1 For Bureau Veritas Certification Holding, Tour ALTO, 4 place des saisons, 92400 COURBEVOIE – France (The official document is in English. Any translations of this document shall be used for reference only.) 1/2 Certificate of Approval AWARDED TO PolyOne France Tossiat Route de la vavrette, 01250, Tossiat - France IATF USI: LWZS4P Bureau Veritas Certification certify that the Quality Management System of the above organisation has been audited and found to be in accordance with the requirements of IATF 16949 - FIRST EDITION and the applicable customer specific requirements SCOPE Design and manufacturing PERMITTED EXCLUSION(S) None PRODUCT(S) DELIVERED colour with additive concentrates for thermoplastic resins and speciality compounds obtained by mixing and extrusion https://e-cer.bureauveritas.com/68LJQE0ZV0CO6I7YW0YSXOUMV9WWROQPHPI2AOHRRLFFVRAVTFVZGXKWIE3TOWLTTKEWCPQB9UNAPXHH6T0HXOMUEDVYPRPJLEXBBTKQYPBRICYOKY143TECQ5UMHGA3JX Date Of Certification: 11 December 2024 Date Of Expiration: 10 December 2027 IATF Certificate N°: 0558656 Bureau Veritas Certification Certificate No: FR094003 - IATF Revision: 1 For Bureau Veritas Certification Holding, Tour ALTO, 4 place des saisons, 92400 COURBEVOIE – France (The official document is in English.

& Canada EMEA Asia Latin America 64% 36% Specialty Engineered Materials Color Additives and Inks 40% 37% 18% 5% 6% 8% 24% 20% 10% 15% 9% 4% 4% Defense Healthcare Packaging Consumer Building & Construction Industrial Transportation Energy Telecom 4 CREATING A WORLD-CLASS SUSTAINABLE ORGANIZATION 1. 6.5% annualized long term sales growth leveraging sustainable solutions, composites, healthcare and emerging regions 2. Deliver annual EBITDA and EPS growth of 10% and 15% 4. GUIDANCE (TOTAL COMPANY) 12 14.8% 15.8% Guidance Actual Adjusted EBITDA Margin % Better-than-expected margins driven by: • Resilient demand for composites and sustainable solutions which improved mix of higher margin applications • Deceleration of raw material inflation • Cost reduction activities Q1 EBITDA BRIDGE (TOTAL COMPANY) 13 $ millions CAI: Price / Mix 19) Inflation (4) SEM: Price / Mix 6) Inflation (4) Net Price Benefit 17) Wage and Energy Inflation (13) Cost Reductions 8) FX (6) Q1 2023 Actual $134) Adjusted EBITDA Q1 2022 Pro Forma $ 176) Demand (48) • Weak demand conditions in-line with previous expectations • Pricing continues to cover inflation of raw materials, wages and energy U.S. & Canada 40% EMEA 38% Asia 17% Latin America 5% Q1 2023 SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 18% Packaging 23% Healthcare 7% Industrial 16% Building and Construction 10% Defense 6%Telecommunications 4% Energy 5% END MARKET REVENUE (1) Total company sales and adjusted EBITDA of $846M and $134M, respectively, include intercompany sales eliminations and corporate costs $537M $91M $310M $64M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $134M$846M (1) 14 Transportation 11% Q1 2023 SALES BY REGION Yo Y C H A N G E ( E X C L .

AVIENT: WHO WE ARE 38 21 9 34 • U.S. and Canada • Latin America • Europe, Middle East & Africa • Asia 25,000+ CUSTOMERS Headquartered in Avon Lake, OH (Cleveland) 8,800+ employees 100+ manufacturing plants Key Financial Data 2022E Sales $5.1 billion 2022E EBITDA $635 million 2022E EPS $3.50 >70% ARE CUSTOMIZED SOLUTIONS TO UNIQUE SPECIFICATIONS of sales 3 WHO WE ARE – VISION, STRATEGY, CULTURE 4 Avient Corporation (NYSE: AVNT) provides specialized and sustainable material solutions that transform customer challenges into opportunities, bringing new products to life for a better world. WHAT WE DO: MATERIAL SCIENCE 5 CUSTOM FORMULATION SUSTAINABILITY FOR A BETTER TOMORROW Revenue From Sustainable Solutions* 2016-2021 $310 205 140 80 75 45 40 20 $915M2021 Sales ($ in millions) *Avient Sustainable Solutions definitions aligned with FTC 2012 Guide for the Use of Environmental Marketing Claims (“Green Guides”) **2020 is Pro Forma to include full year of the Clariant Color business Future Growth Revenue Assumptions From Sustainable Solutions: 8 - 12% 6 S E CO N D Q UART E R 2022 RE S U LT S $122 $134 2021 2022 $0.87 $0.98 2021 2022 Q2 2022 PERFORMANCE (TOTAL COMPANY) 8 Sales Adjusted Operating Income $1,235 $1,302 2021 2022 + 5% Adjusted EPS + 10% + 13% (in millions) (in millions) (+ 10% excluding FX) (+ 16% excluding FX) (+ 20% excluding FX) Q2 2022 SEGMENT PERFORMANCE 9 CAI $624 $649 Sales ($ in millions) SEM Distribution $86 $94 Operating Income + 4% + 9% $404 $443 Sales $24 $27 Operating Income + 10% + 13% (1) $241 $244 Sales $37 $37 Operating Income + 1% Flat (+ 10% excluding FX) (+ 16% excluding FX) (+ 6% excluding FX) (+ 3% excluding FX) Q2 2021 $1,235 $122 Sustainable Solutions 17 7% 7 Healthcare 23 14% 5 Composites (ex Outdoor High Performance) 10 20% 4 Growth in Asia / LATAM 5 3% 1 Other 69 11% 5 Sub-total $1,359 10% $144 Outdoor High Performance Impact (9) (5) Wage Inflation and Overtime (7) Other Supply Chain Costs (2) Clariant Color Integration Synergies 7 Incentives, Other Employee Costs 4 FX (48) (7) Q2 2022 $1,302 5% $134 Q2 2022 SALES AND OPERATING INCOME (TOTAL COMPANY) 10 Sales Growth Rate Adjusted Operating Income$ millions Adjusted EBITDA Q2 EBITDA BRIDGE 11 Price increases more than offsets raw material and supply chain impacts Q2 2021 $ 159 Demand (29) $ millions CAI: Price / Mix 87 Inflation (58) SEM: Price / Mix 36 Inflation (24) Distribution: Price / Mix 45 Inflation (41) Net Price Benefit 45 Wage Inflation and Overtime (7) Other Supply Chain Costs (2) Clariant Color Integration Synergies 7 Incentives, Other Employee Costs 4 FX (7) Q2 2022 $ 170   China Lockdowns / Russia Impact $ (14) Outdoor High Performance (5) Transportation (5)  12 Q2 '21 Adjusted EPS 0.87$ Color, Additives and Inks 0.11 Specialty Engineered Materials 0.01 Distribution 0.03 Corporate Costs 0.01 F/X (0.05) Segment OI 0.11$ Interest Expense 0.03 Tax Rate (0.03) Q2 '22 Adjusted EPS 0.98$ Q2 EPS BRIDGE Key Updates • Provided progress on 2030 Sustainability Goals • Emphasized commitment to U.N. EPS (ex Amort) 3.96$ 0.13$ 4.09$ (0.58)$ 3.51$ Pro Forma Leverage (12/31/2022E) Net Debt / Adjusted EBITDA 1.6x 3.4x 2.8x Forecast Dyneema Forecast + Dyneema Sale of Distribution Pro Forma 2022 TWO-YEAR LEVERAGE MODEL 20 3.5x 2.7x 1.6x 2.8x 2.4x 2.0x 2019PF 2020PF 2022E 2022PF 2023E 2024E Dyneema® AcquisitionClariant Color Acquisition (1) Pro forma for the acquisition of the Clariant Color business (2) Pro forma for the acquisition of Dyneema® and potential divestiture of Distribution, including repayment of senior notes due 2023 and Term Loan (1) (1) (2) OUR SPECIALTY JOURNEY CONTINUES 21 • Dyneema® brings leading technology and brand with the World’s Strongest Fiber™, deep history of application development and strong management team focused on specialty applications • Dyneema® transaction is aligned with our previously stated acquisition goal of expanding our composites and fiber capabilities • Similar to our other technology expansion acquisitions, Dyneema® allows us to leverage our invest-to-grow strategy • The possible sale of our Distribution business also presents potential benefits with respect to leverage and EBITDA margins 7% 46% 66% 86% 100% 0% 20% 40% 60% 80% 100% 2005 2010 2015 2021 2022 PF % o f A dj us te d EB IT D A(1 ) JVs Distribution Performance Products & Solutions Specialty (1) Adjusted EBITDA is EBITDA excluding corporate costs and special items (2) Pro forma for the acquisition of Dyneema® and potential divestiture of Distribution (2) Healthcare 4% Packaging 8% Consumer 10% Building & Construction 43% Industrial 15% Transportation 14% Energy 4% Telecom. 2% 2006 2022 Pro forma Healthcare 8% Packaging 23% Consumer 21% Building & Construction 10% Industrial 15% Transportation 9% Energy 4% Telecom. 4% Defense 6% END MARKET TRANSFORMATION TO LESS CYCLICAL INDUSTRIES (W ITH DY N EEM A , EX .

I am a U.S. citizen or other U.S. person (defined below); and 4. No. 10231X Form W-9 (Rev. 10-2018) AVIENT CORPORATION AVIENT COLORANTS USA LLC ✔ 5 E 33587 WALKER ROAD AVON LAKE, OH 44012 3 4 1 7 3 0 4 8 8 1/15/2021 Form W-9 (Rev. 10-2018) Page 2 By signing the filled-out form, you: 1. You may cross out item 2 of the certification. 4.

MSC Certificate Place and date: For the issuing office: Shanghai, 12 June 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 462307-2021-AQ-RGC-RvA Initial certification date: 23 June 2021 Valid: 24 June 2024 – 23 June 2027 This is to certify that the management system of Avient China Company Limited No. 188, Quanzhou Road, Zhongxin Suchu High-Tech Industrial Development Park, Chuzhou, Anhui, China has been found to conform to the Quality Management System standard: GB/T 19001-2016 / ISO 9001:2015 This certificate is valid for the following scope: Design and Manufacture of Color Concentrates, Filling Concentrates and Additive Concentrates http://www.dnv.com/assurance

© 2019, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 BUILDING AND CONSTRUCTION SUPPLIER H E A T E X C H A N G E R : G A S R E C O V E R Y • Resistance to corrosion and fouling • Good thermal conductivity • Good pressure resistance • Compatible with current processing methods – extrusion • Eliminated the effects of corrosion and fouling by replacing aluminum • Improved thermal performance over time • Developed a customized solution that utilized the customers existing extrusion processing methods Therma-Tech™ Thermally Conductive Formulation KEY REQUIREMENTS WHY AVIENT? THERMAL CONDUCTIVITY LEARN MORE AVIENT SOLUTION LEARN MORE © 2020, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 https://www.polyone.com/products/engineered-polymer-formulations/conductive-signal-radiation-shielding-formulations/therma Building and construction supplier

OFF-ROAD VEHICLE MANUFACTURER E N G I N E B R A C K E T • Exceptional structural properties with extremely high stiffness and strength across a broad temperature range (-40 to 160°F) • Excellent creep resistance and fatigue endurance • Lower weight with no reduction in performance • Reduced weight by 40% with zero fatigue failures during extensive field testing • Provided technical support to optimize design for metal-to-composite conversion • Delivered composite solution with similar system cost and more robust performance than failure prone aluminum version Complēt™ Long Carbon Fiber PA66 Composite KEY REQUIREMENTS WHY AVIENT? All Rights Reserved. https://www.avient.com/products/engineered-polymer-formulations/high-temperature-polymer-formulations/compl%C4%93t-long-fiber-reinforced-structural-thermoplastics Off-road vehicle manufacturer

© 2019, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 TRANSPORTATION LIGHTING SUPPLIER H E A T S I N K F O R H I G H P O W E R L E D • A material to replace aluminum • High thermal conductivity - 20 W/mK • Electrically conductive • Increase production rate by 50%, as three secondary operations were eliminated • Reduced the weight of each part by 30% • Collaborated with the customer to participate in the SPE Automotive Innovation Awards Therma-Tech™ TT6600-5001 EC Grey KEY REQUIREMENTS WHY AVIENT? THERMAL + ELECTRICAL CONDUCTIVITY LEARN MORE AVIENT SOLUTION LEARN MORE © 2020, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 https://www.polyone.com/products/engineered-polymer-formulations/conductive-signal-radiation-shielding-formulations/therma Transportation lighting supplier

© 2019, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 LED LIGHT MANUFACTURER H E A T E X C H A N G E R F O R A N E L E C T R O N I C C I R C U I T B O A R D • Looking to replace aluminum • Reduce corrosion • Light weighting • Eliminated the effects of corrosion • Provided a lightweight alternative to aluminium • Redesigned the part for easier processing and further weight reduction • Enabled the customer to take a new, innovative product in to the market Therma-Tech™ Thermally Conductive Formulation KEY REQUIREMENTS WHY AVIENT? THERMAL CONDUCTIVITY & LIGHT WEIGHTING AVIENT SOLUTION LEARN MORE © 2020, All Right Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 https://www.polyone.com/products/engineered-polymer-formulations/conductive-signal-radiation-shielding-formulations/therma Led light manufacturer