Sodium hydroxide is widely used in the manufacturing of paper and pulp. It helps in breaking down wood chips into fibers, which are then processed into paper products. In the chemical industry, it serves as a key ingredient in the production of various chemicals, including detergents, soaps, and bleach. It is also employed in water treatment processes to adjust pH levels and remove heavy metals. In the food industry, sodium hydroxide is used for cleaning and sanitizing equipment, as well as in food processing, such as peeling fruits and vegetables. Additionally, it plays a role in biodiesel production by catalyzing the transesterification of fats and oils.