Figure 12 is one example of gussets used to help reduce warp on long flat faces by adding strength to the wall, preventing it from buckling or curling in on itself. FIGURE 11 - Molded-in inserts FIGURE 12 - Gusset placement on side wall FIGURE 13 - Side wall boss design guidelines FIGURE 14 - Gusset design guidelines ESCR Design Guide 5 Holes should follow best practices for a polymer’s viscosity and tensile strength when determining the ideal distance to the edge versus the wall thickness.

Rev 12-05-2023 Avient Corporation: Quality Response for Manufacturing Facilities in North America, North LATAM, Europe, the Middle East, and Africa 2 Dear Customer, This Quality Response for Manufacturing Facilities in North America, Europe, the Middle East and Africa, is being provided in response to your request to complete and return your supplier questionnaire / assessment.

Q 4 AN D FU LL Y EA R 2020 PE RF O RM AN CE $0.30 $0.52 2019 PF 2020 Q4 2020 ORGANIC PERFORMANCE 9 Sales $922 $997 2019 PF 2020 +8% Adjusted Operating Income Adjusted EPS $58 $80 2019 PF 2020 +38% +73% • Record 4th quarter sales, adjusted operating income and adjusted EPS performance • All segments delivered year-over-year sales and operating income growth, led by consumer and healthcare end markets • Clariant Masterbatch integration synergy capture ahead of schedule: $5 million realized in 2020 ($ in millions except EPS) (1) (1) (1) (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition Q4 2020 SEGMENT PERFORMANCE 10 Sales Operating Income $100 $100 $100 $922 $100 $100 $100 $997 Distribution CAI SEM Total 2019 2020 $178 $272 $490 $191 $305 $526 SEM Distribution CAI 2019PF 2020 +8% +7% +7% +12% $5 $5 $5 $58 $5 $5 $5 $80 Avient CAI SEM Total 2019 PF 2020 $17 $19 $40 $18 $30 $58 Distribution SEM CAI 2019PF 2020 +38% +45% +58% +6% (3) (3) ($ in millions) (1) (2) (1) Total company sales include intercompany sales eliminations (2) Total company reflects adjusted operating income and includes corporate costs (3) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition 2020 HIGHLIGHTS 11 • Completed transformational Clariant Masterbatch acquisition and created new brand name Avient • Increased pro forma adjusted EPS 11% from $1.74 to $1.93 as an essential supplier during the pandemic and due to growth in demand for consumer applications • Specialty Engineered Materials delivered record operating income on gains from composites • Achieved record free cash flow, increased dividend for 10th year in a row and delevered from 3.5x to 2.7x net debt to pro forma adjusted EBITDA • Culture is everything: Certified as a Great Place to Work® $133 $150 2019PF 2020PF 10% 23%8% 21% 4% 15% 2006 2020PF Healthcare Consumer Packaging Avient Portfolio Transformation 22% 59% CLARIANT MASTERBATCH: TRANSFORMATIONAL ACQUISITION 12 Clariant MB EBITDA Growth Purchase Price Multiple 10.8 9.6 6.5 2019PF 2020PF 2020PF w/ Full Synergies x x x • Acquisition of Clariant Masterbatch significantly expands presence in healthcare, packaging and consumer end markets • Strength of portfolio – 13% EBITDA growth as an essential supplier in COVID response and recovery • Acquisition completed on July 1, 2020 for $1.4 billion. Purchase price multiple rapidly declining on strength of business and synergy capture (1) (1) (1) (1) (1) (1) (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition ($ in millions) 13 SEM CAI Avient • Composites and Outdoor High Performance applications drove positive mix within SEM • Clariant Masterbatch synergy realization under way and expected to drive further margin expansion in 2021 • Portfolio transformation to high growth end markets with focus on sustainable solutions megatrend 10.1% 11.8% 2019PF 2020 (1) (1) EBITDA MARGIN EXPANSION Distribution 6.3% 6.0% 15.2% 17.6% 11.1% 12.1% 2019PF 2020PF 14.5% 19.8% 13.5% 16.1% 6.4% 6.3% 15.2% 16.2% (1) (1) Full YearQ4 (2) (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition (2) Total company reflects adjusted EBITDA margins SPOTLIGHT: COMPOSITES 14 • SEM delivers a record year in 2020 – 13% operating income growth and over 200 bps in margin expansion year-over-year • Prior investments in composites platform and outdoor high performance applications paying off, resulting in substantial growth over the last two years SEM Operating Income (OI % of Sales) ($ in millions) $(0.1) $(1.0) $2.2 $19.1 $26.8 2016 2017 2018 2019 2020 Composites Performance (Operating Income) $83.7 $94.4 2019 2020 (11.2%) (13.3%) 0.1 0.1 0.2 0.5 0.6 0.7 0.8 0.9 0.9 1.0 11 12 13 14 15 16 17 18 19 20 $19 $160 $338 2011 2019 2020 0.16 0.20 0.26 0.34 0.42 0.50 0.58 0.72 0.79 0.81 0.85 11 12 13 14 15 16 17 18 19 20 21E FREE CASH FLOW AND CAPITAL ALLOCATION 15 Free Cash Flow Dividends Share Repurchases Deleveraging 3.5x 2.7x 2019PF 2020PF Growing Dividend Cumulative Buybacks Net Leverage $B n $ p e r sh ar e Cash Generation (1) (1) ~$1Bn REPURCHASED OVER LAST 10 YEARS ~$350MM PAID OVER LAST 10 YEARS ~$338MM 2.7x NET LEVERAGE (1) Financial information is pro forma to include a full year of Clariant Masterbatch business acquisition GREAT PLACE TO WORK! SEGMENT HIGHLIGHTS U.S. & Canada 50% EMEA 26% Asia 16% Latin America 8% 2020 SEGMENT, END MARKET AND GEOGRAPHY 30 GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 23% Packaging 21%Industrial 15% Wire & Cable 6% Building & Construction 6% Electrical & Electronics 4% END MARKET REVENUE Transportation 10% Healthcare 15% All data reflects 2020 Pro forma for acquisition of the Clariant Masterbatch business. (1) The total company sales and EBITDA of $3,783M and $457M, respectively, include intercompany sales eliminations and corporate costs $2,043M $331M $709M $124M $1,110M $70M Sales EBITDA Distribution Specialty Engineered Materials Color Additives and Inks $457M$3,783M (1) Packaging 35% Consumer 23% Healthcare 8% Industrial 14% Building & Construction 8% Transportation 7% Wire & Cable 3% Electrical & Electronics 2% C O L O R , A D D I T I V E S & I N K S 2020 PF REVENUE | $2 .0 BILLION US & Canada 31% EMEA 40% Asia 22% Latin America 7% END MARKET REGION 31 2020 figures Pro forma for acquisition of the Clariant Masterbatch business S P E C I A LT Y E N G I N E E R E D M AT E R I A L S Consumer 24% Healthcare 10% Packaging 6% Wire & Cable(1) 24% Electrical & Electronics 13% Transporation 11% Industrial 10% Building & Construction 2% 2020 REVENUE | $709 MILLION END MARKET US & Canada 58% EMEA 23% Asia 19% REGION 32 (1) Approximately 50% of Wire and Cable sales are associated with Fiber Optic Cabling DI S TR IBU T I ON 2020 REVENUE | $1 .1 B ILL ION Healthcare 29% Consumer 25% Packaging 2% Industrial 20% Transportation 14% Electrical & Electronics 5% Building & Construction 4% Wire & Cable 1% US & Canada 82% Asia 3% Latin America 15% END MARKET REGION K E Y S U P P L I ER S 33 AMERICAS EMEA ASIA Consumer 26% Healthcare 19% Packaging 13% Industrial 16% Wire & Cable 7% Building & Construction 5% Electrical & Electronics 4% Packaging 34% Consumer 16%Healthcare 5% Industrial 17% Wire & Cable 10% Building & Construction 8% Electrical & Electronics 3% Packaging 32% Consumer 27% Healthcare 12% Industrial 6% Wire & Cable 6% Building & Construction 4% Electrical & Electronics 9% Transportation 10% Transportation 7% Transportation 4% 2020 figures Pro forma for acquisition of the Clariant Masterbatch business TOTA L C O M PA N Y R E G I O N A L S A L E S BY END MARKET (58% of sales) (26% of sales) (16% of sales) 34 Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

Sono stati allegati al suddetto documento: - il consenso espresso per iscritto dal Consiglio di Ammini- strazione della Società, redatta in inglese, debitamente au- tenticata e apostillata; - copia conforme della delibera del socio unico in data 8 no- vembre 2021, redatta in doppia lingua inglese e francese, de- bitamente autenticata e apostillata; - lo statuto aggiornato della Società, redatto in doppia lin- gua inglese e francese, debitamente apostillato; 2. estratto della Società dal Registro delle Società e del Commercio del Lussemburgo in data 12 novembre 2021, redatto in lingua francese e debitamente apostillato, portante la nuova denominazione sociale.

Button 6: Button 11: Button 7: Button 12: Button 3: Button 8: Button 13: Button 4: Button 9: Button 5: Button 10: 200: 287: 021: 293: 806: 1235: 2695: 814: Yellow C: 226: 2245: Button 29: Button 30: 809: 805:

ONFLEX™ LO 7120-45 ONFLEX™ HT 40A-3S2131 BERGAFLEX™ BFIG 45A-300 Applications HVAC Seals HVAC Seals HVAC Seals Interior - direct airflow Interior & exterior Interior - direct airflow HVAC feature Low VOC/FOG & odor Low VOC/FOG & odor Low odor Cold air Hot air Cold air VDA 270 ≤3.0 ≤3.0 ≤3.0 VOC/FOG VDA 278 (VOC) 97µg/g 100µg/g 196µg/g VDA 278 (FOG) 1131µg/g 1116µg/g 1707µg/g DIN 75201 (FOG) 0.3mg 1.7mg 1.1mg 73°F (23°C) 72 hrs 15% 12% 15% 158°F (70°C) 22 hrs 45% 28% 50% 212°F (100°C) 22 hrs 70% 45% 90% Density 1.15 g/ml 1.00 g/ml 1.17 g/ml Processing Injection Molding Injection Molding/ Extrusion Injection Molding Bonds to Polypropylene Polypropylene/ Polyethylene Polypropylene Hardness range 35–65 Shore A 40–70 Shore A 35–65 Shore A HOW GLS TPEs MAKE THE DIFFERENCE IN AUTOMOTIVE HVAC APPLICATIONS • Low VOC/FOG – externally tested to VDA 278 and shows significant reductions in volatile organic compounds and fogging when compared to current TPE technologies • Industry standards – helps to achieve VOC/ FOG performance standards for improved VIAQ • Reduced manufacturing steps – does not require pre-drying or post heating to reduce VOC in parts produced • Design optimization – color can be added at the machine • Easy to process – can be extruded, injection molded and extrusion blow molded • Recyclable – Our automotive TPEs are compatible with most municipal recycle streams • Global support – Avient automotive TPEs can be manufactured in locations that are convenient to your operations, including North America, Europe or China To learn more about GLS TPEs for automotive applications, contact Avient at +1.844.4AVIENT (+1.844.428.4368).

OnColor™ UL 94 Colorants* • More than 2,000 recognized concentrates available worldwide in all color options • HB rating for most of PP, PS, ABS, PC/ABS, PBT, PA, PA-GF, TPU generic resins • V-0, V-1, V-2 and 5VA/5VB ratings for more than 200 specific engineering resins • Master file of recognized concentrates with scope of use accessible in the UL product finder • Development of custom products for specific resins upon request • Compliance Letters available for REACH and RoHS Cesa™ Flame Retardant Additives for Glow Wire • Fire performance in line with different levels of Glow Wire temperatures (IEC 60695-2-12) • Let-Down Ratio adjustable to reach different levels of Glow Wire temperatures • Non-halogen (in accordance with IEC 61249- 2-21) and non-HBCD** solutions • Wide range of solutions adapted to different polymers (PP, PS, PC) • Color and flame retardants can be combined in one product • Compliance Letters available for REACH and RoHS APPLICATION BULLETIN * Solutions also sold as Renol™ UL 94 Colorants APPLICATION POLYMER GWFI TEMPERATURE TYPICAL LET-DOWN RATIO CONTENT HIPS 750–960°C 5–10% Non-HBCD flame retardant** PC 850–960°C 2–4% Non-halogen in accordance with IEC 61249-2-21 PP homopolymer 850–960°C 4% Non-halogen in accordance with IEC 61249-2-21 PP copolymer 850–960°C 4–8% Antioxidant - metal deactivator ** Non-HBCD means that Hexabromocyclododecane (HBCD) is neither used as starting material during the mixing phase of our products nor intentionally added during production, but it cannot be excluded that it is not present at level of ubiquitous traces in any of the raw materials used in manufacturing of our products.

Performance advantages: • High dielectric strength: composite material is custom formulated to optimize electrical properties resulting in exceptional insulation • Lightweight: insulators are up to 80% lighter than porcelain and utility poles are more than 50% lighter than wood equivalents • High strength: high tensile, compressive, flexural and inter-laminar shear strength to support various design configurations and line loads • Resilient: deflect and return to original shape for structural damping to minimize damages and outages • Durable: insulators are durable and shatter resistant vs. ceramic and glass; composite utility poles are UV corrosion resistant for a long service life Arrestors Electrical Transmission & Distribution Applications COMPONENT DESCRIPTION SIZES Insulators for transmission and distribution Suspension insulators Epoxy/glass fiber rods 0.625" to 1.25" diameter Line post and station post insulators Epoxy/glass fiber rods 1.50" to 4.74" diameter Arresters Cage type Polyester or vinyl ester/glass fiber rods 0.125" to 0.50" diameter Custom tubular Polyester, vinyl ester or epoxy/ glass fiber custom shapes 2.0" to 6.0" envelope size Pole line construction Conductor standoff and equipment support arms Polyester/glass fiber rods 1.50" to 2.00" diameter Guy strain insulators Polyester/glass fiber rods 0.50" to 0.812" diameter Cross arms Tangent and deadend, support braces Polyester/glass fiber rectangular tubes 3.62" x 4.62" and 4.0" x 6.0" rectangular Utility poles GridCore™ Composite Utility Poles Polyester/glass fiber hollow custom tubes 12" to 14" diameter, typical lengths from 35' to 75' Pole line construction, cross arms, rods, and utility poles feature an integral fabric surfacing veil for long-term weather resistance and retention of properties.

Gebze, Kocaeli 41448 Turkey Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Facility: Avient Corporation - Guangzhou, China 2#, Nanyunsan Rd, Huangpu District, Science City Guangzhou Hi-Tech Industrial Development Zone Guangzhou, Guangdong Province 510663 People's Republic of China Facility: Avient Corporation - Guatemala City 27 Avenida 34-11, Zona 12 Complejo Parque Guatemala City 01012 Guatemala Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colorants and Additives for Plastics Facility: Avient Corporation - Binh Duong, Vietnam 03 Street 02, VSIP Thu n An, Binh Duong 820000 Vietnam Facility: Avient Corporation - Butterworth, Malaysia Lot 1232, MK. 15, Kawasan Industri Kecil & Sederhana Butterworth, Penang 14120 Malaysia Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 4 of 10 ABS Quality Evaluations Avient Corporation ISO 14001:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. All rights reserved. 65537Certificate No: Facility: Avient Corporation - Lomagna, Italy Via Piave 12 23871, Lomagna, Lecco Italy Facility: Avient Corporation - Lomas de Zamora, Argentina AV .

Gebze, Kocaeli 41448 Turkey Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Facility: Avient Corporation - Guangzhou, China 2#, Nanyunsan Rd, Huangpu District, Science City Guangzhou Hi-Tech Industrial Development Zone Guangzhou, Guangdong Province 510663 People's Republic of China Facility: Avient Corporation - Guatemala City 27 Avenida 34-11, Zona 12 Complejo Parque Guatemala City 01012 Guatemala Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colorants and Additives for Plastics Facility: Avient Corporation - Binh Duong, Vietnam 03 Street 02, VSIP Thu n An, Binh Duong 820000 Vietnam Facility: Avient Corporation - Butterworth, Malaysia Lot 1232, MK. 15, Kawasan Industri Kecil & Sederhana Butterworth, Penang 14120 Malaysia Activity: Design and Manufacture of Colorants and Additives for Plastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 4 of 10 ABS Quality Evaluations Avient Corporation RC14001®:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. All rights reserved. 65536Certificate No: Facility: Avient Corporation - Lomagna, Italy Via Piave 12 23871, Lomagna, Lecco Italy Facility: Avient Corporation - Lomas de Zamora, Argentina AV .