These customizable thermoplastics provide stable and controlled dielectric performance, plus ultra-low transmission loss at mmWave frequencies up to 220 GHz. Ideal applications include antennas, base stations, resonators, lenses, automotive radar, IoT (Internet of Things) devices, and service providers’ equipment that directly serves end-users, such as routers and modems. Some of the information arises from laboratory work with small-scale equipment which may not provide a reliable indication of performance or properties obtained or obtainable on larger-scale equipment.

AVIENT ADVANCED COMPOSITES OVERVIEW LOWER ENERGY COSTS Requires less energy during installation and use INCREASE COMPETITIVE ADVANTAGE Customizable solutions for specific application needs REDUCE PRODUCT LIFECYCLE COSTS Lower installation time, as well as warranty and �part replacement � expenses EXTEND PRODUCT LIFETIME Corrosion, flame, fatigue and UV resistant for improved durability DESIGN STRONG, LIGHTER WEIGHT COMPONENTS Up to 75% lighter than steel and up to 25% lighter than aluminum ADVANCED COMPOSITES An exceptional alternative to traditional materials such as wood, ceramic and metal, advanced composite solutions enable designers to: • Design lighter weight structural components for increased lifetime performance and improved fuel efficiency—higher strength-to-weight ratios to exceed the structural performance of traditional materials while significantly reducing weight—up to 75% lighter than steel and up to 25% lighter than aluminum • Extend product lifetime to reduce part replacement and decrease warranty expenses— the corrosion, weather, flame and fatigue resistance of composite solutions improve component durability • Reduce product lifecycle costs—the extended product lifetime, along with the potential for reduced installation time and cost due to the lighter weight of composite solutions, significantly reduces the associated cost over the lifetime of a part • Lower energy costs—by leveraging a higher strength-to-weight ratio, composite solutions allow designers to engineer products that require less energy or power during installation and use • Increase competitive advantage—Avient advanced composite solutions can be customized to provide electrical insulation, thermal insulation, radiopacity, low thermal expansion, flexural memory and load damping, while delivering desired performance and aesthetic specifications TRANSPORTATION Truck floors, liners and aerodynamic components, rail car doors and panels, automotive structural solutions, leaf springs, traffic safety markers and delineators, air cargo unit load devices (ULDs) The Avient advanced composites portfolio offers customized solutions to serve a full range of markets and industries, including: USES & APPLICATIONS ENERGY Wind turbine blade stiffening components, sucker rods, oil & gas production solutions BUILDING & CONSTRUCTION Structural blast protection, garage doors, modular construction, temporary shelters, architectural columns, concrete and masonry reinforcements, pipe reinforcement HEALTHCARE External orthopedic fixators, endoscopy wands, prosthetics MARINE Panels for decking, bulkheads, cabinets, doors, transoms, ceilings; reinforcements for stringers; sail battens CONSUMER & RECREATION Archery bow limbs and risers, furniture springs, diving board springs, golf flagpoles, snowsports equipment, sporting stick shafts, paddle shafts, lightweight and extendable mast structures ELECTRICAL & TELECOMMUNICATIONS Utility poles and cross-arms, high voltage transmission & distribution insulator cores, surge arresters, bus bar covers and electrical tool components INDUSTRIAL Pallet stiffeners, pipe reinforcement, conveyor springs, dock shelters PROCESSES & CAPABILITIES Avient’s reinforced composite technologies use carbon, glass and aramid fibers with custom formulated thermoset or thermoplastic resins in continuous forming processes. These methods include: PULTRUSION • Fibers are impregnated with liquid thermoset resins, then pulled through a heated die to cure the resin and form the product • This continuous, automated manufacturing process creates constant cross section profiles of any pre-determined length with consistent, uniform quality and exceptional mechanical performance • Applications include rods and profiles of various lengths and complexities, such as utility poles, insulator core rods and structural beams CONTINUOUS FILAMENT WINDING • Combines the principles of filament winding with pultrusion to create constant or tapered cross- sectional tubing in precision sizes • The unique axial and biaxial fiber orientation provides flexural and tensile strength, as well as crush and burst resistance • Applications include lightweight shelter frames and sporting goods components CONTINUOUS RESIN TRANSFER MOLDING (CRTM™) • Engineered core materials are sandwiched between structural composite laminate face sheets • Continuous composite sandwich panels feature high specific strength and stiffness-to-weight ratio • Applications include ballistic resistant panels, truck floors and rail car doors CONTINUOUS FIBER REINFORCED THERMOPLASTICS • Fully recyclable tape, X-Ply™ (0°/90°), and other multi-ply configurations with widths up to 10' wide • Sandwich panels in unlimited lengths, up to 6" thick and 10' wide • High volume production capacity • Applications include structural and aerodynamic components in transportation, and reinforcement of materials such as wood and metal THERMOSET COMPOSITE LAMINATES & BARSTOCK • Unidirectionally reinforced barstock, laminates and hybrid composites engineered to maximize deflection and fatigue resistance • Customizable shapes and sizes • Applications include archery bow limbs, flat springs, prosthetics, sporting equipment THERMOSET FINISHING OPERATIONS • Customized finishing capabilities for barstock and laminates including machining, water-jet cutting, profiling/shaping, sanding, slitting, laminating, molding and coatings TESTING CAPABILITIES • Mechanical – Flexural, tensile, compression, shear, fatigue, impact resistance • Physical – Specific gravity/density, Barcol hardness, water absorption, void content, resin/fiber content, dye penetrant, viscosity • Thermomechanical – Coefficient of linear thermal expansion, glass transition temperature, deflection temperature, degree of cure, curing properties • Electrical – High-voltage, low current dry arc resistance of solid electrical insulation, dielectric strength, water diffusion ABOUT AVIENT ADVANCED COMPOSITES The Avient advanced composites portfolio consists of Glasforms™, Gordon Composites™ and Polystrand™ branded materials. Some of the information arises from laboratory work with small-scale equipment which may not provide a reliable indication of performance or properties obtained or obtainable on larger-scale equipment.

From Cesa™ additives that extend equipment life, to OnColor™ colorants that provide creative special effects, to specialty engineered polymers, our technologies improve the performance and aesthetics of EV charging stations. Some of the information arises from laboratory work with small-scale equipment which may not provide a reliable indication of performance or properties obtained or obtainable on larger-scale equipment. Avient is a premier provider of specialized and sustainable material solutions and services that transform customer challenges into opportunities.

Regulatory advice and support services Our team of experts in global regulatory compliance can advise and provide required supporting documentation. Technical Support Services Our team of technical service engineers are located globally to provide full training and manufacturing support. Some of the information arises from laboratory work with small-scale equipment which may not provide a reliable indication of performance or properties obtained or obtainable on larger-scale equipment.

Compared to traditional pole materials, fiber reinforced polymer (FRP) composites are more durable, require less maintenance, and provide a longer service life. Some of the information arises from laboratory work with small-scale equipment which may not provide a reliable indication of performance or properties obtained or obtainable on larger-scale equipment. ABOUT AVIENT Avient Corporation (NYSE: AVNT) is a global provider of specialized and sustainable materials solutions, with 9,300 employees and a revenue of approx. $3.1 billion.

Apex’s sole responsibility was to provide independent verification on the accuracy of the GHG emissions reported, and on the underlying systems and processes used to collect, analyze and review the information. Page 3 WATER RESOURCES • ENVIRONMENTAL SERVICES • INDUSTRIAL HYGIENE  •  SAFETY  •  SUSTAINABILITY  Apex Companies, LLC • (800) 733‐2739 • www.apexcos.com  Statement of independence, impartiality and competence Apex is an independent professional services company that specializes in Health, Safety, Social and Environmental management services including assurance with over 30 years history in providing these services. Miami, Florida Lakewood, Colorado July 24, 2023 This verification declaration including the opinion expressed herein, is provided to Avient and is solely for the benefit of Avient in accordance with the terms of our agreement.

Apex’s sole responsibility was to provide independent verification on the accuracy of the GHG emissions reported, and on the underlying systems and processes used to collect, analyze and review the information. Page 3 WATER RESOURCES • ENVIRONMENTAL SERVICES • HEALTH & SAFETY • CLIMATE CHANGE Apex Companies, LLC • (800) 733-2739 • www.apexcos.com Statement of independence, impartiality and competence Apex is an independent professional services company that specializes in Health, Safety, Social and Environmental management services including assurance with over 30 years history in providing these services. Miami, Florida Santa Ana, California July 26, 2022 This verification opinion declaration, including the opinion expressed herein, is provided to Avient and is solely for the benefit of Avient in accordance with the terms of our agreement.

Abrasion  Yarn on Yarn Abrasion Ultraviolet (UV) Flame  Chemical (Acid) Chemical (Alkali) Chemical (Organic Solvent) P O X P P P P This data is provided for informational purposes only, and does not constitute a specification. For over 25 years, FIBER-LINE® has provided science- driven expertise that improves the performance and the end-use processing of high performance fibers.  • FIBER-LINE®’s ability to add value to the already attractive properties of both Kevlar®Para-Aramid & Nomex® Meta-Aramid creates more opportunity in the market place to provide solution driven products to a diverse range of markets. • Because FIBER-LINE® already processes so many dif- ferent types and deniers of both Kevlar® & Nomex®, we have been authorized by DuPont™ to distribute small quantities of these fibers to an ever-growing customer base

The TIN provided must match the name given on line 1 to avoid backup withholding. For mortgage interest paid, acquisition or abandonment of secured property, cancellation of debt, contributions to an individual retirement arrangement (IRA), and generally, payments other than interest and dividends, you are not required to sign the certification, but you must provide your correct TIN. Form 1099-INT (interest earned or paid) • Form 1099-DIV (dividends, including those from stocks or mutual funds) • Form 1099-MISC (various types of income, prizes, awards, or gross proceeds) • Form 1099-B (stock or mutual fund sales and certain other transactions by brokers) • Form 1099-S (proceeds from real estate transactions) • Form 1099-K (merchant card and third party network transactions) • Form 1098 (home mortgage interest), 1098-E (student loan interest), 1098-T (tuition) • Form 1099-C (canceled debt) • Form 1099-A (acquisition or abandonment of secured property) Use Form W-9 only if you are a U.S. person (including a resident alien), to provide your correct TIN.

Avient does not provide reconciliations of forward-looking non-GAAP financial measures, such as outlook for Adjusted EBITDA, Adjusted Earnings Per Share, Net Debt/Adjusted EBITDA and Free Cash Flow to the most comparable GAAP financial measures on a forward-looking basis because Avient is unable to provide a meaningful or accurate calculation or estimation of reconciling items and the information is not available without unreasonable effort. Management believes this provides comparability of the performance of the combined businesses. A reconciliation of these measures to their most directly comparable GAAP measures is provided in the tables below.