Maleic acid is widely used in the production of polymers and resins, particularly in the manufacture of unsaturated polyester resins. These resins are essential in creating fiberglass-reinforced plastics, which are used in automotive parts, construction materials, and marine applications. In the agricultural sector, maleic acid serves as an intermediate in the synthesis of various pesticides and herbicides, helping to protect crops from pests and weeds. It is also utilized in the food industry as a pH regulator and preservative, enhancing the stability and shelf life of certain products. Additionally, maleic acid plays a role in the textile industry, where it is used in dyeing and finishing processes to improve the quality and durability of fabrics. Its ability to form complexes with metal ions makes it valuable in water treatment applications, where it helps to prevent scale formation and corrosion in industrial water systems. In the pharmaceutical field, maleic acid is employed as an excipient in drug formulations, aiding in the stabilization and controlled release of active ingredients. Its versatility and reactivity make it a crucial component in various industrial and commercial applications.