Thirumalai Chemicals Ltd (TCL) is involved in the manufacture and sale of organic chemicals. The company is one of the leading producers of phthalic anhydride, which is crucial in the production of plasticizers, pigments, dyes, and resins. TCL serves industries such as fiberglass-reinforced plastics, pigments and dyes, herbicides, insecticides, fire retardants, polyester polyols, and rubber scorch inhibitors. The company exports its products to over 60 countries and has been in operation for over forty years.

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TCL focuses on innovation to drive expansion and maintain dynamic progress. The company conducts R&D activities in areas such as reducing input use, including raw materials, chemicals, energy, and water, as well as reducing effluent generation from each production plant. Additionally, the company works on improving product quality by developing process improvements for implementation in the plant. The R&D unit of TCL is responsible for managing research and development activities, focusing on reducing input use and effluent generation, and improving product quality through process enhancements. The company has two patents granted. In FY2025, the company spent R&D of INR19.1 million which stood at 0.09% of company's total sales and declined by 22.7% YoY.