Poly(acrylic acid-co-maleic acid) solution is widely used as a scale inhibitor in water treatment processes. It effectively prevents the formation of scale deposits, such as calcium carbonate and calcium sulfate, in industrial cooling systems, boilers, and reverse osmosis membranes. Its chelating properties help to sequester metal ions, reducing the risk of corrosion and improving system efficiency.

In the detergent industry, this copolymer acts as a builder, enhancing the cleaning performance of laundry and dishwashing detergents. It softens water by binding to calcium and magnesium ions, preventing them from interfering with surfactants. This results in better stain removal and reduced detergent usage.

Additionally, it is employed in the textile industry as a dispersing agent during dyeing processes. It ensures uniform dye distribution, improves color fastness, and reduces the likelihood of dye agglomeration. Its versatility and effectiveness make it a valuable component in various industrial and household applications.