The primary use is as a raw material for nylon 66 and engineering plastics. Secondly, it is used for the production of various ester products, as plasticizers and advanced lubricants. In addition, adipic acid is also used as a raw material for polyurethane elastomers and as an acidifying agent for various foods and beverages, sometimes surpassing citric acid and tartaric acid. Adipic acid is also a raw material for pharmaceuticals, yeast purification, insecticides, adhesives, synthetic leather, synthetic dyes, and fragrances.