Trinseo Releases Annual Sustainability and Corporate Social Responsibility Report

Company achieves best safety results in six years and continues to
reduce environmental footprint

BERWYN, Pa.–(BUSINESS WIRE)–$TSE #CSR—Trinseo
(NYSE: TSE), the global materials company and manufacturer of plastics,
latex binders, and synthetic rubber, today has published its 2017
Sustainability and Corporate Social Responsibility (CSR) Report,
which showcases how Trinseo is meeting or exceeding the highest
standards of safety and environmental performance, and developing
innovative solutions that benefit our world. This marks Trinseo’s
seventh report since the company’s formation in 2010.

In 2016, Trinseo continued its trend of reducing its environmental
footprint, as measured by a range of environmental performance
indicators. Since its first report in 2011, the company achieved
reductions in the following areas:

• Total waste, down 59%
• Volatile organic chemical (VOC) emissions, down 50%
• Greenhouse gas emissions from sources that are owned or controlled by
  Trinseo, down 25%
• Electricity usage, down 9%

The 2017 Sustainability and CSR Report profiles how the company’s
products help its customers improve their own sustainability in areas
such as vehicle lightweighting to improve fuel efficiency, green tire
technology, medical device design flexibility and parts consolidation,
home appliance manufacturing, LED horticulture lighting, and more. The
report also outlines Trinseo’s programs in product quality, safety,
ethics and compliance, volunteerism, and Responsible Care®.

“At Trinseo, our commitment to sustainability and corporate social
responsibility is innate to our culture, and every employee plays a
crucial role in advancing our mission to improve the world around us,”
said Chris Pappas, President and CEO. “In accordance with our Core
Values of innovation, respect, and integrity, we are continually looking
for ways to green the value chain —to allow and empower our customers to
deliver end-products that are more advanced and sustainable, all the
while ensuring our own operations are as efficient as possible.”

The report also details Trinseo’s record environmental, health, and
safety (EH&S) performance. Trinseo’s recordable injury rate for 2016 was
0.07, the lowest it has ever been, and a rate that is significantly
lower in comparison to other manufacturers and American Chemistry
Council (ACC) member companies. Trinseo achieved its best safety results
since the company’s formation in 2010, placing Trinseo in the top tier
of all chemical companies.

“Trinseo believes in the vision of zero, with the ultimate goal of zero
on-the-job incidents,” said Catherine Maxey, Trinseo’s Vice President,
Public Affairs, Sustainability, and EH&S. “We are proud to report that
in 2016, 83 percent of eligible teams earned our Triple Zero recognition
for zero incidents, making 2016 a remarkable year for Trinseo in EH&S
performance. Our record safety performance is a testament to the
commitment to safety embedded within our culture, which reflects our
focus on safeguarding the well-being of every person at every site,
every day.”

The 2017 Sustainability and CSR report is available online at www.trinseo.com/sustainability.

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and
manufacturer of plastics, latex binders, 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 $3.7 billion in net
sales in 2016, with 15 manufacturing sites around the world, and nearly
2,200 employees. For more information visit www.trinseo.com.

Note on Forward-Looking Statements

This press release may contain “forward-looking statements” within the
meaning of the safe harbor provisions of the United States Private
Securities Litigation Reform Act of 1995. Words such as “expect,”
“estimate,” “project,” “budget,” “forecast,” “anticipate,” “intend,”
“plan,” “may,” “will,” “could,” “should,” “believes,” “predicts,”
“potential,” “continue,” and similar expressions are intended to
identify such forward-looking statements. Forward-looking statements in
this press release may include, without limitation, forecasts of growth,
revenues, business activity, acquisitions, financings and other matters
that involve known and unknown risks, uncertainties and other factors
that may cause results, levels of activity, performance or achievements
to differ materially from results expressed or implied by this press
release. As a result of the foregoing considerations, you are cautioned
not to place undue reliance on these forward-looking statements, which
speak only as of the date of this press release. The Company undertakes
no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information, future events or
otherwise.

® Responsible Care is a registered service mark of the American
Chemistry Council in the United States.

Contacts

Press contact:
Vault Communications
Stephanie Kensy, +1
610-455-2767
[email protected]
or
Investor
contact:
Trinseo
Donna St.Germain, +1 610-240-3307
[email protected]