Company completes acquisition of Hexion Inc.’s global epoxy business for ~$1.2 billion Leading global supplier of coatings and composites used in wind turbine blades and automotive structural components to expand Westlake’s chemical materials portfolio Epoxy addition reaffirms Westlake commitment to sustainability with materials that benefit renewable energy and the light-weighting of aerospace and automotive industries Westlake Chemical Corporation (NYSE: WLK) today announced that it has completed the acquisition of Hexion Inc.’s global epoxy business for approximately $1.2 billion in an all-cash transaction. Based in Rotterdam, The Netherlands, the epoxy business, which will be branded as Westlake Epoxy, is an industry leader in the manufacture and development of specialty resins, coatings and composites for a variety of industries, including high-growth and sustainability-oriented end-uses such as wind turbine blades and light-weight automotive structural components. “With this

Westlake Chemical Corporation (NYSE: WLK) will release its fourth quarter and full year earnings for 2021 prior to the market opening on Tuesday, February 22, 2022. The company will host a conference call at 11:00 a.m. Eastern Time (10:00 a.m. Central Time) on the same day to discuss the earnings release. To access the conference call, dial (855) 760-8160, or (704) 288-0624 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 8356311. The conference call will also be available via webcast at https://edge.media-server.com/mmc/p/bty22e28 and the earnings release can be obtained via the company’s Web page at https://investors.westlake.com/news/default.aspx . A replay of the conference call will be available beginning two hours after its conclusion for seven days. To hear a replay, dial (855) 859-2056 or (404) 537-3406 for international callers. The replay passcode is 8356311. About Westlake: Westlake is a global manufacturer and

Westlake Chemical Partners (NYSE: WLKP) will release its fourth quarter and full year earnings for 2021 prior to the market opening on Tuesday, February 22, 2022. The company will host a conference call at 1:00 p.m. Eastern Time (12:00 p.m. Central Time) on the same day to discuss the earnings release. To access the conference call, dial (855) 765-5686, or (234) 386-2848 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 6369819. The conference call will also be available via webcast at https://edge.media-server.com/mmc/p/vb94ivzb and the earnings release can be obtained via the company's Web page at https://investors.wlkpartners.com/corporate-profile/default.aspx . A replay of the conference call will be available beginning two hours after its conclusion for seven days. To hear a replay, dial (855) 859-2056 or (404) 537-3406 for international callers. The replay passcode is 6369819. About Westlake Chemical Partners: Westlake

$0.4714 cents per unit distribution declared payable on February 17, 2022 The Board of Directors of Westlake Chemical Partners GP LLC, the general partner of Westlake Chemical Partners LP (the "Partnership") (NYSE:WLKP), has declared a distribution of $0.4714 per unit. This is the 30th quarterly distribution announced by the Partnership since its initial public offering. The distribution will be payable on February 17, 2022, to unit holders of record on February 3, 2022. This release is intended to be a qualified notice under Treasury Regulation Section 1.1446-4(b). Brokers and nominees should treat one hundred percent (100.0%) of the Partnership’s distributions to non-U.S. investors as being attributable to income that is effectively connected with a United States trade or business. Accordingly, the Partnership’s distributions to non-U.S. investors are subject to federal income tax withholding at the highest applicable effective tax rate. About Westlake Chemical Partners LP Westlake

New PVC Pipe Features Higher Performance and a Lower Carbon Footprint Than Past Products North American Pipe Corporation (NAPCO), a subsidiary of Westlake Chemical Corporation (NYSE: WLK), today announced the launch of a new product, molecular oriented PVC (PVCO) pipe. The new PVCO pipe features a lower manufacturing carbon footprint than other water main materials. This investment in state-of-the-art technology expands NAPCO’s production capacity at the company’s Woodbridge, Ontario, pipe and fittings facility. “Our focus is on delivering pipe and fitting systems that address our customers’ most difficult infrastructure challenges, including product longevity, ease of installation and enhancing water flow,” said Andre Battistin, vice president, NAPCO Pipe & Fittings. “With sustainability and innovation firmly anchored in our corporate culture, we are actively bringing new products to market with lower environmental impacts throughout the life cycle assessment. The new PVCO

Leading global supplier of coatings and composites used in wind turbine blades and automotive structural components to expand Westlake’s chemicals portfolio Westlake Chemical Corporation (NYSE: WLK), today announced that it has entered into a definitive agreement with Hexion Inc. to acquire Hexion’s global epoxy business for approximately $1.2 billion. Based in Rotterdam, The Netherlands, Hexion’s epoxy business is an industry leader in the manufacture and development of specialty resins, coatings and composites for a variety of industries, including high-growth and sustainability-oriented end-uses such as wind turbine blades and light-weight automotive structural components. In the twelve months ended September 30, 2021, Hexion’s epoxy business had net sales of approximately $1.5 billion. With this transaction, which is anticipated to be completed in the first half of 2022 following customary closing conditions, Westlake will significantly expand its integrated business by adding a

Company Rolls Out Second Lower-Carbon Product in 2021 Following its Introduction of Lower Carbon Caustic Soda in February 2021. Westlake Chemical Corporation (NYSE: WLK) today announced its Vinnolit subsidiary in Germany launched GreenVin™ Polyvinyl Chloride (PVC), a lower-carbon alternative PVC, which is one of the most widely utilized plastics in the construction, automotive and medical sectors. "Market demand for lower-carbon plastics and materials is rising rapidly as more customers are seeking ways to reduce their carbon footprints and meet their sustainability goals,” said Vice President, Europe & Asia Vinyls Chemicals, Dr. Karl-Martin Schellerer. “GreenVin™ PVC performs as well as traditional PVC while offering a more climate-friendly product that our customers can feel good about using. This product and the entire GreenVin™ product line are part of our overall commitment to meeting society’s needs and enabling a better future.” The introduction of GreenVin™ PVC follows the

$0.2975 cents per share dividend declared payable on December 8, 2021 The Board of Directors of Westlake Chemical Corporation (NYSE:WLK) declared today a regular dividend distribution of $0.2975 per share for the third quarter of 2021. This dividend will be payable on December 8, 2021, to stockholders of record on November 23, 2021. This is the 69th successive quarterly dividend that Westlake has declared since completing its initial public offering in August 2004. About Westlake Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, we provide the building blocks for vital solutions — from building products and infrastructure materials, to packaging and healthcare products, to automotive and consumer goods. For more information, visit the company's web site at www.westlake.com . View source version on businesswire.com: https://www.businesswire.com/news/home/20211112005871/en/ Media Inquiries: