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Although statistical significance could not be determined, a large effect size (d > 1) as described by Cohen's d was observed for all treatment groups relative to their respec- tive controls. All samples were tested in duplicate (n = 2); the bar graph represents the average, and the open circles represent the log10-transformed raw data. All substrates also exhibited heavy bacterial growth (>100 colonies) prior to washing during ASTM E1428-15a pink stain testing, with only PEI and polysulfone demonstrating resistance to staining (Figure 1; Table S1).

Avient Climate-related Scenario Analysis Summary SCOPE & TIME HORIZON AVIENT SCENARIO NET ZERO FUTURE PLEDGING PROGRESS STEADFAST POLICY CONVENTION 1.3-1.5°C 1.9-2.3°C 2.4-2.8°C TRANSITION RISK Net Zero Emissions Scenario Announced Pledges Scenario Stated Policies Scenario (IEA WEO 2021 1 scenarios) (NZE) | 1.4°C (APS) | 2.1°C (STEPS) | 2.6°C Emissions peak at 2050 and slowly decline through 2100 Emissions continue to rise beyond 2100 at slower rates Emissions continue to rise beyond 2100 at current rates BUSINESS IMPLICATIONS Increased transition risk: Business impacted by climate policies, carbon prices, market pressures and technological advancements Increased physical risk: Business impacted by direct damages and indirect discruption assocated with severe changes in climate driven weather events · Highly regulated policy environment · Moderate policy regulation · Few changes to current policy settings · Ambitious; net zero commitments achieved at most all levels · Government commitments and National Determined Contributions are achieved · Not all stated commitments are achieved · Improved air pollution in advanced and emerging market & developing economies · Rising air pollution levels especially in emerging market and developing economies · Doubling of the frequency of extreme heat events by 2050 and 120% increase in intensity & rising air pollution levels especially in emerging market and developing economies · Expectation of signifcant capital allocation for innovative product design, energy efficiency investments, and clean electrification of operations · Additional levels of R&D investment will be required to contribute to and attain announced commitments. · Continued R&D investment in current initiatives is expected · Steep increases in advanced economies' carbon prices · Considerable increases in emerging economies' carbon prices · Some change in carbon prices · Declining fuel prices · Regional variability in fuel prices, though slight net increase · Rising fuel prices 1 International Energy Agency World Energy Outlook 2021 The following summarizes Avient's climate-related risks and opportunities analyzed across multiple scenarios, in alignment with the Task Force on Climate-Related Financial Disclosures (TCFD) framework. CLIMATE-RELATED SCENARIOS ANALYZED Global operations through 2050 PARAMETERS & ASSUMPTIONS EXCEED 2.5°C EXCEED 2.0°C RETURN BELOW 1.5°C IMPACT DRIVER & TIME HORIZON NET ZERO FUTURE PLEDGING PROGRESS STEADFAST POLICY Policy & Legal Risk M L Carbon pricing exposure in USA, China, Germany and Spain Fines and/or compliance measures: · Clean electrification of operations; · Emissions intensive equipment phase-out; · Circular economic and materials efficiency strategies; · Net-zero carbon building standards; · Mandatory energy management systems and audits Carbon pricing exposure in USA, China, Germany, Spain, and Saudi Arabia Increased fines and compliance measures related to: · Phase-outs aligned with Nationaly Determined Contributions (NDC); · Renewable energy sourcing; · Material efficiency standards (minimum recycled content for packaging, and enhanced vechicle air quality) Some regional carbon pricing exposure in China, Germany and Spain Technology Risk S M Capital expenditures to subsitute emissions intensive technologies Declining price point competitiveness caused by decarbonization pass through costs R&D costs to transition to design and deploy lower-emissions technologies Slower substitution of materials with lower- emission options Market Risk S M Declining redundant supply and sourcing more sustainably causes raw material costs to rise Customers demand to lower their scope 3 emissions from purchased goods and services across all markets Increasing competition from existing and unforeseen polymer and non-polymer- based products that reduce further impact on climate Customer behaviors from advanced economies demand lower carbon products Rising degree of uncertainty in raw material prices Slow customer behavior changes in some advanced economies High degree of uncertainty in energy market signals Reputation Risk L Chemical sector or certain petrochemical materials (i.e., plastics) stigmatized Rising expectations for rapid innovation and displacement of older, heavily carbon- intensive designs and manufacturing processes NDC countries expected to innovate and seek rapid minimization of customers' scope 3 emissions Increased concern from stakeholders for not addressing climate change globally or for the chemicals sector Acute & Chronic Risk L Possible direct damage to fixed assets and logistics disruptions in both our value chain and operations More frequent and intense weather events and changing preciptation patterns are likely to damage manufaturing faciliites, disrupt logistics and sourcing activities, and negatively affect employee health and communities where we operate More frequent and intense weather events and changing preciptation patterns are likely to affect the performance of grids and thermal plants while pushing up demand for cooling, damage fixed assets, disrupt logistics and sourcing activities, and negatively affect employee health and communities where we operate IMPACT DRIVER & TIME HORIZON NET ZERO FUTURE PLEDGING PROGRESS STEADFAST POLICY Resource Efficiency Opportunity S M L More efficient production and distribution processes, reduced natural resource usage, continued use of recycling, and inclusion of recycled materials in our products such as reSoundTM R, ColorMatrix™ Capture™ Oxygen Scavenger, among others will contribute to increasing product revenues and reduced operating costs Resource efficiency efforts supported by capital allocation in NDC countries is more likely and may accelerate a path toward maximizing ROI and reducing operating costs Less regulatory and pressure to incentivize may cause gains from efforts to lag Energy Source Opportunity M L Use of greater external financing options, such as operating lease arrangements or energy performance shared savings contracts, to source lower emission-energy and new technologies, such as carbon capture, utilization & storage (CCUS), in our operations may reduce operating costs and maximize returns on investment Use of lower emission-sources of energy in operations will lower operating costs and contribute toward reductions of our scope 1 and 2 emissions and product carbon intensities Use of renewable energy, increased efficiency, and electrification initiatives will lower operating costs and contribute toward reductions of our scope 1 and 2 emissions and product carbon intensities. We are positioned to capture enhanced market share over expanding and emerging needs that will also enable climate resiliency High revenue growth opportunities to meet demand for highly efficient chemical materials that will contribute to lowering customers' emissions as part of our Sustainable Solutions label High to moderate revenue growth opportunities for new chemical materials pertinent to Avient's customers' strategies (low-carbon and otherwise) and are in compliance with any existing regulations (i.e., VOC reducing materials that address vehicle air quality standards) Impact Legend Time horizon Legend Low impact S - short-term 0-5 years Moderate impact M - medium-term 5-15 years High impact L - long-term 15-30 years BUSINESS IMPLICATIONS AND STRATEGIC RESPONSES BUSINESS IMPLICATIONS AND STRATEGIC RESPONSES IMPACT DRIVER & TIME HORIZON Policy & Legal Risk M L Technology Risk S M Market Risk S M Reputation Risk L Acute & Chronic Risk L IMPACT DRIVER & TIME HORIZON Resource Efficiency Opportunity S M L Energy Source Opportunity M L Products & Services and Markets Opportunities S M L · We have embedded an energy intensity KPI (covering process and builidng efficiencies) into the incentive structure for all employees. · By 2030, Avient will enable 100% of our products manufactured for packaging applications to be recyclable or reusable to advance the circular economy, for which approximately 90% of Avient’s products met this criteria in 2020.

All equipment is integrated into the unit, including the metering peristaltic pump. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

Recommended use: all air filtration applications SOFT TOUCH Cesa™ soft touch solutions provide a soft touch feel to nonwoven fabrics which come into contact with skin. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

DURABILITY High Impact Strength, Weatherability SOLUTION: PP, HDPE, ASA, Nylon Engineered Formulations AESTHETIC APPEAL Custom Color & Special Effects, Paint Replacement SOLUTION: Custom Polymer Colorants, Pre-Colored High-Gloss Thermoplastics THERMAL MANAGEMENT LED Heat Sinks, Design Flexibility SOLUTION: Thermally Conductive Formulations EXTREME PERFORMANCE Chemical & Fire Resistance, High Temperature Performance SOLUTION: Nylon Engineered Formulations, Long Fiber Reinforced Composites, Continuous Fiber Composite Tapes & Laminates, Flame Retardant Polyolefin Formulations STRUCTURAL INTEGRITY High Stiffness-to-Weight Ratio, Metal Replacement SOLUTION: Pultruded Rods, Tubes & Custom Profiles, Long Fiber Reinforced Composites SENSORY EXPERIENCE Vibration Damping, Durability, Customization, Custom Color, Low Friction SOLUTION: Thermoplastic Elastomers (TPEs), Custom Polymer Colorants, Internally Lubricated Formulations, Advanced Composite Springs STRENGTH & STABILITY Excellent Dimensional Stability, High Stiffness, Impact Resistance SOLUTION: Short & Long Fiber Formulations, Continuous Fiber Composite Tapes & Laminates SURFACE PROTECTION Performance Enhancements SOLUTION: Scratch & Mar Resistance, UV Stable Additives, Anti-Static Additives STRUCTURAL PERFORMANCE Corrosion Resistance, Lightweighting SOLUTION: Long Fiber Reinforced Composites, Nylon Engineered Formulations, Continuous Fiber Composite Tapes & Laminates, Chemical Foaming Additives METAL REPLACEMENT Lightweighting, Heat Management, Load Carrying Capability SOLUTION: Long Fiber Reinforced Composites, Continuous Fiber Composite Tapes & Laminates TACTILE EXPERIENCE Soft-Touch Feel, Durability SOLUTION: Thermoplastic Elastomers (TPEs) A COLLABORATION THAT BRINGS STYLE & GRIT To all thrill seekers, fans and enthusiasts, your brand says, “Bring it!” You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

Now let’s bring it all together. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.

Once the framework is established, the development process kicks into high gear, utilizing a comprehensive toolbox of cutting-edge technologies: • Mood boards for conceptualization • Extensive color libraries, both physical and digital • Rapid prototyping and sampling • Photorealistic 3D rendering • Accurate cost and feasibility assessment tools This iterative process allows for quick turnarounds and efficient approvals, ensuring that the final product meets all expectations. You have the responsibility to conduct full-scale end-product performance testing to determine suitability in your application, and you assume all risk and liability arising from your use of the information and/or use or handling of any product.