Westlake Polyethylene Achieves ISCC PLUS Certification at Sulphur, Louisiana Site

Westlake Corporation (NYSE: WLK) announced that Westlake Polyethylene’s LDPE Sulphur, Louisiana manufacturing site attained ISCC PLUS certification on November 6, 2025.

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11/06/2025 - 09:00 AM

HOUSTON--(BUSINESS WIRE)-- Westlake Corporation (NYSE: WLK) announced that Westlake Polyethylene’s LDPE Sulphur, Louisiana manufacturing site has attained the globally-recognized International Sustainability & Carbon Certification (ISCC) PLUS certification. This achievement includes mass balance certification, recognizing the site’s robust systems for tracing and managing alternative raw materials throughout the polymer production process to advance sustainability goals.

“The ISCC PLUS certification at our Polyethylene site in Sulphur, Louisiana is an important milestone in our commitment to deliver more sustainable solutions for our customers,” said Amy Moore, Vice President – Olefins & Polyethylene. “This certification recognizes our expanding portfolio of innovative polymers with recycled or renewable content in support of a circular economy. The ISCC PLUS certification confirms and helps accelerate our progress as an industry leader in producing polymers with attributed bio or circular content and reduced carbon footprints.”

Several other Westlake sites have previously earned ISCC PLUS certification for their products, reflecting the company’s ongoing dedication to responsible manufacturing practices and more sustainable products. This enables the production of polymer products with improved environmental profiles and greater transparency in material sourcing.

Westlake Polyethylene offers a comprehensive range of polyethylene solutions, including low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ethylene vinyl acetate copolymers (EVA), and a strong portfolio of specialty PE polymers. Our offerings are designed to meet the diverse needs of our customers, from food and flexible packaging to agricultural films and other industrial applications.

About Westlake

Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, with operations in Asia, Europe and North America, we provide the building blocks for vital solutions — from housing and construction, to packaging and healthcare, to automotive and consumer. For more information, visit the Company's web site at www.westlake.com.