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IRPC

Thai integrated petroleum refining and petrochemical company headquartered in Rayong.

Last updated August 26, 2026

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Overview

IRPC Public Company Limited, commonly known as IRPC, is a Thai integrated petroleum-refining and petrochemical company based in Mueang Rayong District, Rayong Province. Its name refers to the company’s integrated refinery and petrochemical complex, reflecting a business model that links crude-oil processing with the manufacture of petrochemical feedstocks and downstream materials. The company is part of PTT Group and is listed on the Stock Exchange of Thailand. The business traces its origins to Thai Petrochemical Industry Public Company Limited, commonly abbreviated as TPI, which was established in 1978 by the Leophairatana family. During its early development, the company built an industrial platform intended to connect refining, petrochemical production, supporting infrastructure, and downstream manufacturing. IRPC began producing plastic pellets for sale in 1982. It subsequently expanded its range of plastic-resin products and developed additional factories and infrastructure for a more complete petrochemical system. IRPC’s operating base is concentrated in Rayong, one of Thailand’s principal industrial and petrochemical areas. The company’s production system is described as having three main components: a petroleum refinery, a lube-base-oil refinery, and a petrochemical plant group. Its refinery processes crude oil into products including liquefied petroleum gas, naphtha, gasoline, diesel, fuel oil, solvents, and asphalt. These outputs also provide feedstocks for petrochemical operations. The lube-base-oil business produces grades identified as 60 SN, 150 SN, 500 SN, and 150 BS. These materials serve as inputs for lubricant manufacturing and for industrial applications such as transformers, automobiles, engines, trucks, trains, and machinery exposed to high friction. The petrochemical complex uses refinery-derived naphtha and liquefied petroleum gas as feedstocks for upstream products, including olefins and aromatics. These primary petrochemicals are then used to produce downstream plastic resins supplied to plastic converters and other continuous-process industries. IRPC experienced substantial financial pressure after Thailand floated the baht during the Asian financial crisis in 1997. The company entered a formal business-rehabilitation process in 2000. Its rehabilitation was completed successfully on April 26, 2006. This episode was a major turning point in the company’s corporate history, after which its integrated refinery and petrochemical platform continued under the IRPC identity and within the PTT Group structure. The company’s position is therefore based on integration rather than on a single consumer-facing product. Refining provides fuels, specialty petroleum materials, and petrochemical feedstocks; the petrochemical plants convert those feedstocks into basic chemicals and plastic resins; and the lube-base-oil operations serve industrial and automotive lubricant markets. IRPC’s principal customers are consequently industrial users, plastic processors, lubricant manufacturers, and other businesses rather than household consumers. Public reference material identifies Thailand as its operating base and Rayong as its headquarters location; a more detailed current geographic breakdown and current product-market mix are not established in the supplied sources.

History

IRPC’s history is rooted in Thailand’s development of an integrated petrochemical industry. The company was founded in 1978 as Thai Petrochemical Industry Public Company Limited, or TPI, by the Leophairatana family. Rather than limiting itself to one category of chemical output, the business developed an industrial chain intended to connect refinery operations, petrochemical feedstocks, processing facilities, and infrastructure supporting downstream production. A significant early milestone came in 1982, when the company began producing plastic pellets for sale. This marked the transition from building industrial capacity toward supplying materials to commercial customers. Over time, the product portfolio expanded into different forms of plastic resin, while the company added factories and infrastructure intended to support a more complete petrochemical complex. The resulting model relied on the conversion of refinery outputs into primary petrochemicals and then into materials used by plastic processors and other industrial manufacturers. The company’s Rayong base became the center of this integrated system. Its production platform came to include a petroleum refinery, a lube-base-oil refinery, and a group of upstream and downstream petrochemical plants. The petroleum refinery produces LPG, naphtha, gasoline, diesel, fuel oil, solvents, and asphalt. Naphtha and LPG also function as feedstocks for petrochemical production. The petrochemical facilities use these inputs to manufacture olefins and aromatics, which in turn support the production of plastic resins. This vertical connection gives the business a relationship between fuel production, chemical intermediates, and industrial polymer markets. The lube-base-oil refinery added another industrial product stream. Its listed grades include 60 SN, 150 SN, 500 SN, and 150 BS, with uses ranging from transformer and automotive-lubricant production to applications in engines, trucks, trains, and machinery. These products demonstrate that the company’s output extends beyond transport fuels and commodity petrochemicals into intermediate materials used by other manufacturers. IRPC’s development was severely affected by the Asian financial crisis. After Thailand floated the baht in 1997, the company encountered financial difficulties and entered a business-rehabilitation process in 2000. The rehabilitation period represented a major restructuring phase in the company’s corporate history. According to the supplied reference material, the process was successfully completed on April 26, 2006. The company is now identified as IRPC Public Company Limited, an acronym associated with Integrated Refinery & Petrochemical Complex. It operates as part of PTT Group and is described as a public company listed on the Stock Exchange of Thailand. Its headquarters and principal industrial operations are in Mueang Rayong District, Rayong Province. The available reference material supports describing IRPC as an active Thai integrated refinery and petrochemical company, but it does not provide a sufficiently current account of management, annual financial performance, detailed overseas operations, or recent corporate programs.

  • 2006

    Business rehabilitation is completed

    [1]

    The company successfully completes its rehabilitation process on April 26, 2006.

  • 2000

    Business rehabilitation begins

    [1]

    The company enters a formal business-rehabilitation process following its financial difficulties.

  • 1997

    Thai baht crisis creates financial pressure

    [1]

    The floating of the Thai baht during the Asian financial crisis contributes to severe financial difficulties for the company.

  • 1982

    Plastic-pellet production begins

    [1]

    The company begins producing plastic pellets for commercial sale and starts expanding its resin-related product activities.

  • 1978

    Thai Petrochemical Industry is founded

    [1]

    Thai Petrochemical Industry Public Company Limited, later associated with IRPC, is founded by the Leophairatana family.

Products and positioning

An integrated Thai refinery and petrochemical producer linking petroleum refining, lube-base-oil manufacturing, upstream petrochemicals, and downstream plastic-resin production.

  • Petroleum refining

    Refined petroleum products

    IRPC’s refinery produces a range of petroleum outputs, including liquefied petroleum gas, naphtha, gasoline, diesel, fuel oil, solvents, and asphalt. Naphtha and LPG also serve as feedstocks for the company’s petrochemical operations, linking the refinery to the wider integrated production system.

  • Lubricant intermediates

    Lube base oils

    The lube-base-oil refinery produces grades identified as 60 SN, 150 SN, 500 SN, and 150 BS. These base materials are used by lubricant manufacturers and in industrial, automotive, transformer, engine, transport, and high-friction machinery applications.

  • Basic petrochemicals

    Olefins and aromatics

    IRPC’s petrochemical plant group uses refinery-derived naphtha and LPG to manufacture primary petrochemical products such as olefins and aromatics. These materials provide feedstock for downstream chemical and polymer production.

  • Polymers · 1982

    Plastic resins and pellets

    Plastic pellets and resin products are supplied as industrial materials for plastic-forming operators and related continuous-process industries. The company began producing plastic pellets in 1982 and later broadened its resin portfolio as its integrated complex expanded.

Brand decisions

  • 2000

    Entry into business rehabilitationOther

    Background

    Financial difficulties following the 1997 Thai baht crisis led the company to enter a formal rehabilitation process.

    Action taken

    The company proceeded with a business-rehabilitation program intended to address its financial condition and support continued operations.

    Aftermath

    The rehabilitation was reported as successfully completed on April 26, 2006.

Recent events

  • 2006

    IRPC completes business rehabilitation[1]

    Other

    IRPC, formerly Thai Petrochemical Industry, completed its business-rehabilitation process on April 26, 2006, following financial difficulties associated with the 1997 Thai baht crisis.

Sources1 sources

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