Thirumalai Chemicals Limited is an India-based company, which is engaged in the manufacturing of phthalic anhydride, maleic anhydride, fumaric acid and fine chemicals. It operates through the manufacture and sale of organic chemicals segment. Its product, phthalic anhydride, is used in the manufacturing of unsaturated polyester resins (UPR), which are commonly used in fiberglass-reinforced plastics. Phthalic anhydride also has applications in the production of herbicides, insecticides, insect repellents, fire retardants, polyester polyols, and rubber scorch inhibitors. Its malic acid is used in the manufacture of skin and dental care products and can be used in a number of technical applications, such as electroplating and metal cleaning. The fumaric acid products are used in the manufacturing of medicines, drinks, food, animal feed, cleansing agents, unsaturated polyester, alkyd resins, and printing inks. Its diethyl phthalate (DEP) is used to make plastics more flexible.