CSR is an Australian building-products company with origins in sugar refining and a major presence in insulation, plasterboard and related construction materials.
Last updated August 31, 2026
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Overview
CSR is an Australian industrial and building-products company whose history stretches back to the Colonial Sugar Refining Company, founded in Sydney in 1855 by Edward Knox. Although its name is strongly associated with Australian sugar, the company’s contemporary business is focused primarily on construction materials. Its portfolio has included insulation, plasterboard, fibre-cement products, aerated concrete, bricks, wall systems and related components used in residential, commercial and infrastructure construction. The original company began by refining imported raw sugar at facilities in Sydney and expanded into Melbourne during the 1850s. From the late nineteenth century it developed central sugar mills and plantations in New South Wales, Queensland and Fiji. Under Edward William Knox, CSR became one of the most important sugar millers and refiners in Australasia. Its operations included sugar production, refining, molasses processing and ethanol manufacture. CSR held highly influential positions in Queensland and Fiji sugar markets for much of the colonial and post-colonial period, although this expansion was also associated with the coercive recruitment and harsh treatment of South Sea Islander, Indian and other migrant labourers. CSR began diversifying into building products in the 1940s, establishing a plaster mill in Sydney in 1942 and commencing plasterboard manufacture in 1947. The company acquired Bradford Insulation in 1959, giving it a substantial position in insulation products. Over subsequent decades it broadened its construction-materials activities into fibre cement, aerated concrete, bricks, permanent formwork and systems used to support plasterboard installation. Its building-products portfolio became increasingly important as the company separated or sold non-core activities. The group also participated in heavy construction, mining and glass. It acquired construction and mining contractor Thiess in 1980, but sold the construction division the following year. In 2003 it spun off heavy building-products interests into Rinker Group. CSR established Viridian glass in 2007 and sold that business in 2019. These transactions reflected a long-term effort to concentrate the company around selected building-materials categories rather than operate as a broadly diversified industrial conglomerate. CSR separated its sugar and energy operations from its building-products business in 2009, placing them under the Sucrogen name. Sucrogen was sold to Wilmar International in 2010; the former sugar business subsequently became known as Wilmar Sugar. This divestment ended CSR’s direct role as a major sugar producer and left the company principally identified with building products. The CSR brand nevertheless remains historically linked to Australian retail sugar through the company’s earlier operations. A major adverse chapter in CSR’s history concerns the Wittenoom blue-asbestos mines in Western Australia, operated by a CSR subsidiary from 1948 to 1966. Workers, families and others were exposed to crocidolite fibres, and many later developed mesothelioma, lung cancer and other asbestos-related diseases. Litigation and compensation arrangements continued for decades, producing substantial liabilities and severe reputational damage. The Wittenoom record is widely regarded as one of Australia’s most serious industrial disasters. In 2024, Saint-Gobain acquired CSR for approximately A$4.5 billion, bringing the Australian building-products group into the French multinational’s international construction-materials portfolio. CSR therefore continues as a Saint-Gobain subsidiary, with its corporate base in North Ryde and activities centred on Australian and New Zealand building products. Reported 2021 information described a workforce of more than 3,000 people and an after-tax profit of A$146 million, although those figures relate to that specific reporting period rather than current performance.
History
CSR was established in Sydney in 1855 as the Colonial Sugar Refining Company. Edward Knox initially built the business around refining imported raw sugar at Sydney facilities, followed by expansion into Melbourne through an associated company. By the late 1860s, imported supplies had become less attractive, so CSR developed central mills that processed cane grown by independent farmers in northern New South Wales. This integrated milling-and-refining model enabled the company to become a dominant force in the Australian sugar industry. In 1880, management passed to Edward William Knox, who expanded CSR into Queensland and Fiji. The company established plantations and mills, including operations at Victoria and Homebush in Queensland and Nausori and Rarawai in Fiji. These operations relied on systems of indentured and coerced labour, including South Sea Islanders and later Indian workers. The use of recruited island labour, high mortality and alleged abuses became a major historical blemish on the company’s colonial expansion. During the 1890s, CSR moved away from directly managed Queensland plantations and increasingly relied on smaller farmers supplying centrally located mills. CSR continued to build a regional sugar network. It opened or operated refineries and mills in Australia, Fiji and New Zealand, including the Chelsea refinery near Auckland and the Lautoka mill in Fiji. Its influence in Queensland sugar refining lasted for decades. Sugar operations also generated by-products such as molasses and ethanol, extending the company into energy and industrial alcohol markets. The company began its move into construction materials during the Second World War era. It built a plaster mill in Sydney in 1942 and started manufacturing plasterboard in 1947. The acquisition of Bradford Insulation in 1959 provided an important platform in thermal and acoustic insulation. CSR subsequently developed or acquired businesses producing fibre cement, aerated concrete, bricks, wall formwork and plasterboard support systems. It also entered construction contracting, mining and glass, but many of these businesses were later sold, separated or placed into other corporate structures. CSR’s 1980 acquisition of Thiess was followed by the sale of its construction division in 1981. In 2003, heavy building-products interests were spun off into Rinker Group. Viridian was created in 2007 and divested in 2019. In 2009, CSR separated its sugar and energy activities under the Sucrogen name, then sold Sucrogen to Wilmar International in 2010. The transaction marked the end of CSR’s direct participation in the sugar industry and left building products as its central business identity. CSR’s history is also defined by the Wittenoom asbestos disaster. From 1948 to 1966, a CSR subsidiary operated blue-asbestos mines at Wittenoom in Western Australia. Exposure affected employees and many other people who lived in, visited or passed through the area. The resulting diseases included mesothelioma and lung cancer. Warnings were raised before the mine closed, and litigation intensified during the 1980s. A 1988 judgment awarded damages to a former worker and criticised the company’s approach to safety. CSR and the Western Australian State Government Insurance Commission later agreed to share compensation costs. The legacy created continuing legal, financial and reputational consequences. Following the sugar divestment and other disposals, CSR concentrated on building materials, especially insulation and interior construction systems in Australia and New Zealand. In 2024 Saint-Gobain acquired the company for approximately A$4.5 billion. CSR now operates as part of Saint-Gobain, retaining its Australian corporate base and established building-products activities.
- 2024
Acquired by Saint-Gobain
[1]Saint-Gobain acquired CSR for approximately A$4.5 billion.
- 2019
Viridian sold
[1]CSR divested its glass business.
- 2010
Sucrogen sold to Wilmar
[1]Wilmar International acquired CSR’s sugar and ethanol business.
- 2009
Sugar and energy separation
[1]CSR separated its sugar and energy operations and placed them under the Sucrogen name.
- 2007
Viridian established
[1]CSR established Viridian as its glass business.
- 2003
Rinker Group separation
[1]CSR spun off its heavy building-products interests into the separately listed Rinker Group.
- 1980
Thiess acquired
[1]CSR acquired construction and mining contractor Thiess in a hostile takeover.
- 1959
Bradford Insulation acquired
[1]The acquisition strengthened CSR’s position in insulation and construction materials.
- 1947
Plasterboard production begins
[1]The company began manufacturing plasterboard for building interiors.
- 1942
Entry into plaster manufacturing
[1]CSR constructed a plaster mill in Sydney, beginning its long-term diversification into building products.
Products and positioning
A long-established Australian building-materials company positioned around construction products, insulation and interior systems, now operating within Saint-Gobain’s global construction-materials group.
Insulation · 1959
Bradford Insulation
Bradford Insulation is CSR’s insulation business, acquired in 1959. It supplies thermal and acoustic insulation used in residential and commercial buildings. The business has been an important part of CSR’s construction-materials identity and supports the company’s positioning around energy efficiency, indoor comfort and building performance.
Interior construction systems · 1947
Gyprock plasterboard systems
CSR’s plasterboard activities originated with production beginning in 1947. The business supplies plasterboard and associated interior-lining solutions for walls and ceilings, along with products used by builders, installers and renovators. Its offering forms part of CSR’s broader interior construction systems portfolio.
Sheet building materials
Fibre-cement products
CSR produces fibre-cement sheeting for construction applications. These products are used in building envelopes, walls and other areas where a durable sheet material is required. They complement CSR’s plasterboard and insulation activities within the building-products portfolio.
Masonry and wall systems
Aerated concrete products
CSR’s aerated-concrete activities provide lightweight construction products for walls and related building applications. The category extends the company beyond interior linings into structural and envelope-related materials.
Plasterboard framing and support systems
Rondo systems
Rondo is associated with systems that support plasterboard construction, including framing and installation components. The business operates as part of CSR’s interior construction offering and is designed to work alongside plasterboard and lining products.
Sugar and industrial products · 1855
Sugar and ethanol
Historically, CSR produced refined sugar, molasses and ethanol through its extensive Australian, Fijian and New Zealand sugar operations. This business was separated as Sucrogen in 2009 and sold to Wilmar International in 2010, so it is no longer part of CSR’s current core portfolio.
Controversies
1988
Wittenoom blue-asbestos exposure
CSR operated blue-asbestos mines at Wittenoom through a subsidiary from 1948 to 1966. Workers, families and other visitors were exposed to crocidolite fibres, and many later developed fatal diseases including mesothelioma and lung cancer. Litigation in the 1980s led to court awards, compensation negotiations and continuing criticism of the company’s safety practices.
1886
Coercive labour and plantation deaths
CSR’s nineteenth-century Queensland and Fiji plantation expansion relied on recruited South Sea Islander and other indentured labour. Inquiries documented kidnapping, removals and high mortality among workers, creating a serious historical record of labour exploitation associated with the company’s sugar operations.
Brand decisions
2024
Acquisition by Saint-GobainM&ABackground
CSR had become a focused building-products company with established Australian and New Zealand operations.
Action taken
Compagnie de Saint-Gobain acquired CSR for approximately A$4.5 billion.
Aftermath
CSR became a subsidiary of Saint-Gobain and was removed from the public-market context associated with its previous corporate structure.
Acquisition value. A$4.5 billion (2024 acquisition)
2010
Sale of Sucrogen to WilmarM&ABackground
The separated sugar and ethanol business represented CSR’s historic agricultural and food-processing operations.
Action taken
CSR sold Sucrogen to Singapore-based Wilmar International.
Aftermath
The business became part of Wilmar’s sugar operations and was later known as Wilmar Sugar.
2009
Separate sugar and energy operationsStrategyBackground
CSR was diversifying away from its historical sugar base and separating businesses with different operating profiles.
Action taken
The company placed its sugar and energy activities under the Sucrogen name while continuing to operate building-products activities separately.
Aftermath
Sucrogen was sold to Wilmar International in 2010, leaving CSR focused principally on building materials.
Sources2 sources
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