Isononanoic acid

Isononanoic acid (CAS 26896-18-4, EC 248-092-3) is a branched-chain C9 fatty acid, also known under trade designations such as Cekanoic C-9 Acid and Isononansaure. It carries no E-code classification and is not a food additive. The molecular formula is C9H18O2.

In lubricant and metalworking formulations, isononanoic acid functions as a precursor to ester-based base oils and corrosion inhibitors, where its branched structure reduces pour point and improves oxidative stability. In plastics processing, it serves as a building block for plasticizer esters, contributing flexibility to PVC and similar polymer systems. Personal care formulators use its derivatives as emollients and emulsifiers.

Isononanoic acid is subject to REACH registration requirements for supply within the European Economic Area. It is handled and shipped as a liquid in standard industrial packaging including drums and IBC containers. Buyers should request a current Safety Data Sheet and confirm grade specifications prior to procurement.