Chlorine and water treatment chemicals

Wilmington, Delaware-based specialty chemicals company (NYSE: CC); spun off from DuPont in 2015. Holds the FM-200 trademark for HFC-227ea (heptafluoropropane, GWP 3,220) clean fire suppression agent. Primary production: El Dorado, Arkansas (322 Southfield Cutoff Road, El Dorado AR 71730) — the key Chemours fluorochemicals plant; produces FM-200, pharmaceutical-grade HFC-227ea, and 1336E; also added HFO production unit at El Dorado in January 2022. Fayetteville, NC is a different Chemours site linked to GenX/PFAS contamination of Cape Fear River. Louisville, KY is linked to HFC-23 emissions controversy. In 2023, Chemours partnered with A-Gas to enable recycled FM-200R (UL-listed, FM-approved) as a response to tightening AIM Act supply limits. The AIM Act imposed 30% additional US HFC production cut in 2024 (on top of 10% in 2023) = 40% total reduction from 2022 levels — directly impacting Chemours' FM-200 output. Also produces Opteon refrigerants and Teflon products. Chemours is the largest Western producer of HFC-227ea by revenue market share.

US chlor-alkali and VCM producer (NYSE: OLN, HQ Stamford CT; ~$6B revenue); the largest US chlorine producer and a major feedstock supplier to the PVC resin industry. Olin does not directly produce PVC resin but produces the chlorine and vinyl chloride monomer (VCM) that PVC resin manufacturers (Westlake, Shintech, OxyChem) depend on. Olin's chlor-alkali operations in Freeport TX (the largest chlorine plant in the US), McIntosh AL, Niagara Falls NY, and other sites collectively make Olin the critical upstream enabler of the US PVC supply chain. Olin also owns Winchester ammunition — meaning the same company that produces the chlorine input for PVC pipe also manufactures rifle and shotgun ammunition, a striking dual-use combination under one NYSE ticker. Olin's chlorine pricing directly sets the economics for US PVC resin production.

One of only three US domestic trichlor (trichloroisocyanuric acid) producers; subsidiary of SCP Pool Corporation / KIK Consumer Products. Westlake, Louisiana facility produces ~one-third of US trichlor supply; fire from Hurricane Laura (Aug 2020) shut plant for 2+ years (reopened Nov 2022), causing nationwide pool chemical shortage.

Japanese glass and chemicals conglomerate (TSE: 5201, formerly Asahi Glass); world's largest EUV photomask blank supplier by revenue (~55-59% market share). EUV blank production via 100%-owned subsidiary AGC Electronics Co., Ltd. at Koriyama, Fukushima, Japan (production started January 2022; 30% capacity expansion January 2024; ¥40B+ sales target by 2025). Unrelated businesses in same parent: automotive glass (world #1 market share), architectural/float glass, pharmaceuticals and agrochemical active ingredients, life sciences. Same company that makes your car windshield also makes the blank every EUV photomask starts from.

One of three US domestic trichlor producers; formerly Clearon Corp., acquired by Solenis (Platinum Equity-backed specialty chemical company) on September 9, 2022, and formally renamed Innovative Water Care, LLC on July 31, 2023. Operates a 42-acre bulk manufacturing site in South Charleston, WV plus a separate tableting/packaging facility. Produces both trichloroisocyanuric acid (trichlor) and dichloroisocyanuric acid (dichlor). One of the original petitioners in the 2004 antidumping case against Chinese trichlor imports. With BioLab's Conyers, GA plant permanently closed (May 2025) and the market effectively down to three plant locations, Clearon/IWC is one of the two non-OxyChem survivors.

Nation's largest merchant marketer of chlorine and caustic soda (subsidiary of Occidental Petroleum). Key sites: La Porte TX (~527,800 MT/yr chlorine), Taft + Convent LA (~1.03M MT/yr combined). $1.1B La Porte expansion/membrane conversion announced 2022, startup 2026. Declared force majeure post-Hurricane Ida (2021) and Texas freeze (2021).

Privately held, family-owned company (Webre family, founded 1946 by Lloyd Webre Sr.); self-described 'largest supplier to the U.S. chlor-alkali industry,' supplying approximately one-third of all salt used to manufacture US chlorine and caustic soda. Operates 11 solution-mining locations across Texas, Louisiana, New York, and Virginia, connected by 400+ miles of pipelines. Also owns United Brine Pipeline Corporation (common carrier pipeline). Key customers: OxyChem (Ingleside TX), Formosa Plastics (Point Comfort TX), Shintech (Plaquemine LA), Bayer (Baytown TX). Additionally leases 75+ salt caverns for midstream hydrocarbon storage and signed a hydrogen storage partnership with Mitsubishi Power Americas in 2021 — repurposing the same cavern infrastructure for the energy transition.

Japan's leading battery separator film manufacturer (Hipore brand); ~25% global share. Only major wet-process separator plant in the Western Hemisphere (Concord, NC).

HK-listed Chinese PFSA (perfluorosulfonic acid) resin and membrane producer; China's leading domestic PFSA membrane manufacturer for chlor-alkali, desalination, and wastewater treatment. Products have higher tensile strength than recast Nafion but slightly lower oxidative stability — a cost-competitive alternative for the Chinese domestic chlor-alkali market. Not yet a significant exporter to Western regulated markets. Shandong Dongyue represents China's strategic intent to develop domestic PFSA membrane capability to reduce dependence on Chemours and AGC for its rapidly growing chlor-alkali and green hydrogen electrolyzer markets.

German potash and salt producer; operates mines in Germany (Werra, Weser, Harz) and Canada (Bethune mine, Saskatchewan); ~7% of global potash; only Western European potash producer; operates under EU environmental constraints; Bethune mine opened 2017 as first new greenfield potash mine in Canada in decades

Vertically integrated European salt-to-chlor-alkali company (formerly Nouryon Industrial Chemicals, rebranded Nobian 2021); operates the full value chain from salt mining through chlor-alkali electrolysis to merchant chlorine, caustic soda, hydrogen, and chloromethanes. Operations in the Netherlands (Delfzijl, Rotterdam), Germany, and Denmark. Mines its own salt, produces brine, and runs electrolysis plants — the most integrated chlor-alkali model in Northwest Europe. A key anchor in the Dutch and German chemical park ecosystems.

US PVC resin and chlor-alkali manufacturer (NYSE: WLK, HQ Houston TX; ~$13B revenue); the world's largest PVC resin producer and North America's dominant supplier. Westlake acquired Axiall Corporation in 2016 for $3.8B, combining Axiall's chlor-alkali and PVC resin capacity with Westlake's ethylene and VCM operations. Westlake operates integrated PVC plants in Lake Charles, Louisiana (multiple trains) and Sulphur, Louisiana — the largest PVC resin complex in the US by volume, accounting for approximately 28% of US PVC resin capacity. Westlake's PVC resin is the primary feedstock for pipe, siding, window profiles, and wire insulation. The Lake Charles complex sits within the largest concentration of chlor-alkali/VCM/PVC production in the Western Hemisphere. Westlake also makes epoxy resins, caustic soda, and chlorine — the chlor-alkali co-products that finance PVC resin production economics.

US subsidiary of Formosa Plastics Corporation (Taiwan, TWSE: 1301, HQ Taipei; ~$10B revenue); operates a major PVC resin and VCM production complex at Point Comfort, Texas (Calhoun County), on the Gulf of Mexico coast south of Victoria. Formosa Plastics Point Comfort is one of the largest integrated PVC resin complexes in North America — producing ethylene (from ethane cracking), VCM (vinyl chloride monomer), and PVC resin. Point Comfort produces approximately 15% of US PVC resin capacity. The Taiwan parent — Formosa Plastics Group, founded by the late Wang Yung-ching — is one of Taiwan's largest industrial conglomerates, with PVC operations in Taiwan, China, and the US. Formosa's Point Comfort complex has faced repeated Clean Water Act and Clean Air Act enforcement actions from the EPA and Texas Commission on Environmental Quality for discharges to Lavaca Bay.

US minerals company operating Patience Lake Mine (near Saskatoon, Saskatchewan) — a solution potash mine using brine pumped from the Devonian Prairie Evaporite Formation. Patience Lake is one of Saskatchewan's three operating solution mines. Also operates Cote Blanche salt mine (Louisiana), Ogden salt operation (Utah), and is a major North American highway de-icing salt producer. Compass Minerals' Patience Lake operation is smaller scale than Nutrien or Mosaic; the company has faced capital allocation pressures around its Saskatchewan potash asset.

One of China's dominant trichloroisocyanuric acid (TCCA) exporters; located in Juancheng County, Heze City, Shandong — the global center of gravity for TCCA production. One of the two most prominent Chinese companies named in US antidumping administrative reviews (alongside Juancheng Kangtai). China-wide entities face a 285.63% antidumping rate; Heze Huayi has participated in multiple administrative reviews to secure individual company rates. The Juancheng County TCCA cluster also produces dichlor, cyanuric acid, and chlorinated isocyanurate derivatives for export across the Asia-Pacific, Middle East, and Latin America.