Properties Molecular formula: C6H10O4 Molar mass: 146.14 g mol1 Appearance: White crystals (monoclinic) Density: 1.36 g/cm3 Melting point: 152.1 ° C, 425 K, 306 ° F Boiling point: 337.5 ° C, 611 K, 640 ° F Solubility in waterfairly soluble
Applications: The great majority of the 2.5 billion kg of adipic acid produced annually is used as monomer for the production of nylon by a polycondensation reaction with hexamethylene diamine forming 6, 6-nylon. Other major applications also involve polymers: It is a monomer for production of Polyurethane and its esters are plasticizers, especially in PVC.
In medicine Adipic acid has been incorporated into controlled-release formulation matrix tablets to obtain pH-independent release for both weakly basic and weakly acidic drugs. It has also been incorporated into the polymeric coating of hydrophilic monolithic systems to modulate the intragel pH, resulting in zero-order release of a hydrophilic drug. The disintegration at intestinal pH of the enteric polymer shellac has been reported to improve when adipic acid was used as a pore-forming agent without affecting release in the acidic media. Other controlled-release formulations have included adipic acid with the intention of obtaining a late-burst release profile.
In foods Small but significant amounts of adipic acid are used as a food ingredient as a flavorant and gelling aid.  It is used in some calcium carbonate antacids to make them tart.
Safety Adipic acid, like most carboxylic acids, is a mild skin irritant. It is mildly toxic, with an LD50 of 3600 mg/kg for oral ingestion by rats.