In a major step towards backward integration, the Indorama Group set up one of the world single largest train plant to manufacture purified terephthalic acid (PTA) at the Asia Industrial Estate, in the Map-ta-phut petrochemical hub in Rayong, Thailand. The plant commenced commercial production in March 2006 and has an operational capacity of 700,000 mt per annum. The company uses advanced PTA technology from Invista, the world's largest licensor of PTA technology.

DEG and FMO, the German and Dutch development financial institutions have participated in the equity of the company.

The company sources its key raw material Paraxylene from reputable manufacturers and suppliers, which include Exxon Mobil Asia Pacific, Thai Paraxylene, Aromatics Thailand and Petronas.