Solvay Indupa
An Argentine petrochemical producer focused on chlorine chemistry, polyvinyl chloride resins, and caustic soda.
Last updated August 26, 2026
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Overview
Solvay Indupa is an Argentine petrochemical company with operations historically centered on chlorine-based products, polyvinyl chloride (PVC) resins, and caustic soda. The business originated as Indupa, or Indústrias Patagônicas, which was established in Río Negro Province on September 16, 1948. It developed into an important domestic supplier of chlorine and related chemical products before moving its principal operations to Bahía Blanca in 1986, a major petrochemical center in Argentina. The company experienced severe financial pressure during Argentina's economic difficulties in the early 1990s and entered government receivership in 1993. It was returned to private ownership in 1995 through a consortium led by Dow Chemical. In 1996, Brussels-based Solvay acquired control and turned the business into part of its international chemical portfolio. The Solvay-controlled company expanded its regional footprint in 1998 by acquiring Solvay do Brasil and its Santo André facility, a plant that had originally opened in 1941. This combination gave Solvay Indupa a presence in both Argentina and Brazil and made it one of Latin America's larger petrochemical businesses. A proposed change of ownership in 2013 brought the company into a regional competition-policy dispute. Solvay agreed to sell Solvay Indupa to Braskem, a major Brazilian petrochemical producer, but the transaction was rejected by Brazil's competition authority. The proposed deal therefore did not close. In December 2016, Brazilian chemicals group Unipar Carbocloro acquired 70.59% of Solvay Indupa and undertook a public takeover offer for the remaining shares. The company consequently ceased to be controlled by Solvay and became part of Unipar's regional chlorine and petrochemicals platform. Solvay Indupa's industrial identity is tied to basic chemicals used throughout construction, packaging, infrastructure, water treatment, consumer goods, and other manufacturing value chains. PVC resin is a central product, while chlorine and caustic soda are important upstream or associated chemical outputs. Its main industrial base is in Bahía Blanca, and the business has also been associated with a Brazilian office in São Paulo and production assets in Santo André. The company has also been connected with environmental controversy. In 1998, material supplied by Indupa Solvay was implicated in a European dioxin contamination crisis involving lime milk used in the production of Brazilian citrus-pulp pellets. Those pellets entered European cattle-feed channels, and monitoring programs subsequently detected elevated dioxin trends in European dairy and meat samples. Later studies reported continuing contamination in landfill and downstream areas associated with the plant and raised concerns about impacts on sediments and floodplains near the Rio Grande and Paraná River area. These events form an important part of the company's environmental history, although the available reference material does not establish a complete account of remediation, liability, or regulatory resolution. Today, Solvay Indupa is best understood as a regional petrochemical operating company rather than an independent global consumer brand. Its importance comes from industrial production capacity, historical integration into the Solvay network, and subsequent ownership by Unipar Carbocloro.
History
Solvay Indupa traces its origins to Indupa, short for Indústrias Patagônicas, founded in Río Negro Province, Argentina, on September 16, 1948. The company was created as an industrial chemicals producer and became a notable domestic supplier of chlorine, polyvinyl chloride resins, and caustic soda. These products placed it within Argentina's developing petrochemical and chlor-alkali industries, supplying materials used by downstream manufacturers rather than selling primarily to consumers. In 1986, Indupa moved its operations to Bahía Blanca, an important Argentine petrochemical center. The relocation strengthened the company's connection to large-scale industrial infrastructure and regional chemical supply chains. The following decade was considerably more difficult. Economic problems forced the company into government receivership in 1993, reflecting the financial pressures affecting Argentine industry at the time. Indupa was reprivatized in 1995 through a consortium led by Dow Chemical. A year later, Brussels-based Solvay acquired the business and obtained a 51% stake. Under Solvay ownership, the company became part of a larger international chemicals group and operated under the Solvay Indupa name. The business expanded beyond Argentina in 1998 by acquiring Solvay do Brasil and its Santo André facility. The Brazilian plant had opened in 1941, giving the combined operation a long-established manufacturing base and a wider South American market presence. The company also maintained a Brazilian office in São Paulo. The business faced a major strategic transition in 2013. Solvay agreed to sell Solvay Indupa to Braskem, a Brazilian petrochemical company and one of the largest producers in Latin America. The proposed combination raised competition concerns in Brazil, and the country's competition authority rejected the transaction. As a result, Braskem did not complete the acquisition and Solvay retained the business for several more years. In December 2016, Unipar Carbocloro purchased 70.59% of Solvay Indupa. The buyer also committed to a public takeover bid for the remaining shares. This transaction transferred control from Solvay to Unipar and aligned Solvay Indupa with a Brazilian group focused on chlor-alkali and related chemical operations. Environmental issues are another significant element of the company's recorded history. In 1998, Indupa Solvay was implicated in a European dioxin crisis after delivering lime milk with contamination reported at levels many times above normal. The material was used in Brazilian citrus-pulp pellets that were distributed as feed for European cattle. A German monitoring program detected rising dioxin patterns in butter, milk, and meat samples beginning in February of that year. Later studies reported that landfill and downstream areas near the Indupa Solvay plant remained contaminated and suggested possible effects on sediments and floodplains associated with the Rio Grande and Paraná River area. The available reference does not provide a full account of subsequent remediation measures or legal outcomes. The company's historical development therefore combines industrial growth, privatization, multinational ownership, regional expansion, failed consolidation, and environmental controversy. Its principal business remains that of an industrial petrochemical producer, with PVC, chlorine, and caustic soda forming the core of its product identity.
- 2016
Unipar Carbocloro takes control
[1]Unipar Carbocloro acquires 70.59% of the company and commits to a public offer for the remaining shares.
- 2013
Proposed sale to Braskem is rejected
[1]Solvay agrees to sell the company to Braskem, but Brazil's competition authority rejects the proposed transaction.
- 1998
Brazilian expansion and dioxin controversy
[1]The company acquires Solvay do Brasil and its Santo André facility, while material supplied by Indupa Solvay is implicated in a European dioxin contamination crisis.
- 1996
Solvay acquires control
[1]Solvay acquires Indupa and holds a 51% stake, bringing the Argentine producer into its international chemicals group.
- 1995
Reprivatization led by Dow Chemical
[1]Indupa returns to private ownership through a consortium led by Dow Chemical.
- 1993
Government receivership
[1]Economic difficulties lead to the company being placed into government receivership.
- 1986
Operations move to Bahía Blanca
[1]The company relocates its operations to Bahía Blanca, an important center of Argentina's petrochemical industry.
- 1948
Indupa is established in Río Negro Province
[1]Indústrias Patagônicas, later known as Indupa, is established in Argentina on September 16 and begins developing a chlorine-based industrial chemicals business.
Products and positioning
Regional petrochemical and chlor-alkali producer serving industrial customers in Argentina and Brazil.
Petrochemical polymers
Polyvinyl chloride (PVC) resins
PVC resin is one of Solvay Indupa's principal products. It is an industrial feedstock used by converters to manufacture pipes, profiles, cables, flooring, packaging, and other rigid or flexible products. The company is associated with supplying PVC to the Argentine and wider South American market.
Chlor-alkali chemicals
Chlorine
Chlorine is a core product in the company's historical industrial portfolio. It is used in chemical synthesis, disinfection, water treatment, and the manufacture of chlorine derivatives, including materials connected with PVC production. The product is supplied primarily to industrial customers.
Chlor-alkali chemicals
Caustic soda
Caustic soda, or sodium hydroxide, is another established product associated with Solvay Indupa's chlor-alkali operations. It is used in pulp and paper, chemical processing, water treatment, alumina-related processes, and other industrial applications. The available reference identifies it as a leading local product but does not provide a detailed current product catalogue.
Controversies
1998
Dioxin contamination crisis
Indupa Solvay was implicated in a dioxin contamination incident after supplying heavily contaminated lime milk used in Brazilian citrus-pulp pellets. The pellets entered European cattle-feed channels, and monitoring detected increased dioxin levels in dairy and meat samples. Later studies reported continuing contamination concerns around landfill and downstream areas near the plant.
Brand decisions
2016
Transfer of control to Unipar CarbocloroM&ABackground
Following the failed Braskem transaction, Solvay Indupa underwent another ownership change within the South American chemicals sector.
Action taken
Unipar Carbocloro acquired 70.59% of the company and committed to a public takeover bid for the remaining shares.
Aftermath
Solvay Indupa became part of Unipar's regional chlor-alkali and petrochemical platform.
2013
Accept proposed Braskem acquisitionM&ABackground
Solvay sought to sell the regional petrochemical business to Braskem, a major Brazilian producer.
Action taken
Solvay accepted the proposed transaction, but the Brazilian competition authority rejected it.
Aftermath
The sale was not completed, leaving Solvay Indupa under Solvay control until the later Unipar transaction.
Recent events
- 2016
Unipar Carbocloro acquires controlling stake in Solvay Indupa[1]
M&A · Leadership change
Unipar Carbocloro purchased 70.59% of Solvay Indupa and committed to a public takeover offer for the remaining shares, ending Solvay's controlling ownership.
- 2013
Solvay agrees to sell Solvay Indupa to Braskem[1]
M&A · Regulation
Solvay accepted a proposed sale of Solvay Indupa to Brazilian petrochemical producer Braskem. The transaction was subsequently rejected by Brazil's competition authority and did not proceed.
Sources1 sources
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