Sodium 4-Hydroxybenzenesulfonate Dihydrate is widely used in the dye and textile industries as an intermediate in the synthesis of azo dyes. It helps in improving the solubility and stability of dyes, ensuring vibrant and long-lasting colors on fabrics. Additionally, it is employed in the production of photographic chemicals, where it acts as a developing agent to enhance image quality. In the pharmaceutical sector, it serves as a raw material for synthesizing certain drugs and active pharmaceutical ingredients. Its surfactant properties also make it useful in detergents and cleaning products, where it aids in removing stains and improving cleaning efficiency. Furthermore, it is utilized in water treatment processes to inhibit corrosion and scale formation in industrial water systems.