Trinseo Releases its 10th Annual Sustainability & Corporate Social Responsibility Report

HONG KONG,Aug.12,2020 -- Trinseo(NYSE: TSE),a global materials solutions provider and manufacturer of plastics,latex binders,and synthetic rubber,announced the release of its 2020 Sustainability & Corporate Social Responsibility (CSR) Report. The Report showcases how Trinseo excels in its safety and environmental performance while developing innovative solutions that shape a more sustainable world.

Trinseo Sustainability 2020

This is the 10th report since the Company's formation in 2010 and has been prepared in accordance with the Global Reporting Initiative (GRI) Standards Core Option.GRI is the leading independent organization providing a common language and framework for public sustainability reporting,allowing more global comparability and better quality of information about company sustainability impacts.

"Since our founding a decade ago,Trinseo has maintained sustainability as a core value," said Frank Bozich,President and Chief Executive Officer. "After joining Trinseo as CEO last year,I've come to understand this is deeply embedded within the Company and our employees are truly passionate about improving our world by addressing complex materials challenges and delivering products that are intrinsic to daily life."

As Trinseo celebrates its 10th anniversary this year,the Company believed it was high time to embark on an ambitious,measurable,and achievable longer-term sustainability journey by announcing its 2030 Sustainability Goalsearlier this month. This ambitious plan includes 15 long-term goals under five main categories that target climate change,sustainable products,supplier responsibility,responsible operations,and a sustainable workforce. These goals were created,in part,from a critical assessment of the Company's capabilities as well as valuable feedback from customers and suppliers.

Products and innovations highlighted in the 2020 Sustainability & CSR Report include:

Plastics

Establishment of value chain partnerships to advance the quality and use of recycled polystyrene

Launching a line of thermoplastic elastomers (TPE) for medical devices

Latex Binders

Introduction of a new self-cross-linking latex binder technology for the textile industry

Assisting in the development and design of an innovative "non-wood" paper product

Synthetic Rubber

Continuing to advance the capabilities of S-SBR Rubber used in high performance tires to reduce rolling resistance and improve fuel efficiency of motor vehicles

Safety

Achieving an injury rate of 0.11,which places Trinseo in the upper echelons of the chemical industry for safety

Recording no Process Safety Incidents for the fifth year in a row

"Industry and society have reached a pivotal crossroads on the path toward a more sustainable future," said Walter van het Hof,Global Industry Affairs & Sustainability Leader. "Intense consumer and regulatory pressure,rapid climate change,shifting societal norms,the threat of plastics in our oceans,and most recently,the global devastation of COVID-19 have coalesced and thrust us into a new era of sustainability."

Trinseo's 2020 Sustainability & CSR report is available online at trinseo.com/sustainability.

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and manufacturer of plastics,and synthetic rubber. We are focused on delivering innovative and sustainable solutions to help our customers create products that touch lives every day — products that are intrinsic to how we live our lives — across a wide range of end-markets,including automotive,consumer electronics,appliances,medical devices,lighting,electrical,carpet,paper and board,building and construction,and tires. Trinseo had approximately $3.8 billion in net sales in 2019,with 17 manufacturing sites around the world,and approximately 2,700 employees. For more information visit www.trinseo.com.

Cautionary Note on Forward-Looking Statements

This press release may contain "forward-looking statements" including,without limitation,statements concerning plans,objectives,goals,projections,expectations,strategies,future events or performance,and underlying assumptions and other statements,which are not statements of historical facts. Forward-looking statements may be identified by the use of words like "expect","estimate","will","may",or expressions of similar meaning. Forward-looking statements reflect management's evaluation of information currently available and are based on the Company's current expectations and assumptions regarding its ability to meet its sustainability goals,the impact from the COVID-19 pandemic,the Company's business,the economy and other future conditions. Specific factors that could cause future results to differ from those expressed by the forward-looking statements include,but are not limited to,risks related to the ongoing impact of the COVID-19 pandemic and those discussed in the Company's Annual Report for the year ended December 31,2019 filed with the Securities and Exchange Commission ("SEC"),in subsequent Quarterly Reports on Form 10-Q and in other filings and furnishings made by the Company with the SEC from time to time. Other unknown or unpredictable factors could also have material adverse effects on the Company's performance. As a result of these or other factors,the Company's actual results may differ materially from those contemplated by the forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof and are not a guarantee of future performance. The Company undertakes no obligation to publicly update or revise any forward-looking statement as a result of new information,future events or otherwise,except as otherwise required by law.

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