Dibutyl oxalate

Dibutyl oxalate (CAS 2050-60-4, EC 218-092-8), also known as di-n-butyl oxalate or butyl oxalate, is an ester formed from oxalic acid and n-butanol. It carries no assigned E-code and is referenced in chemical databases under the synonym NSC 8468. It belongs to the organic acids category and is commercially handled as a clear, colourless liquid.

In plastics and polymer processing, dibutyl oxalate functions as a plasticizer by intercalating between polymer chains to reduce intermolecular forces and improve flexibility. It also serves as a solvent and carrier in metalworking lubricant formulations, where its ester structure provides controlled solvency and compatibility with additive packages at elevated temperatures.

Dibutyl oxalate is supplied in standard industrial grades and falls under REACH registration requirements for EU market compliance. It is available in drum and IBC packaging formats typical for liquid esters. Buyers should confirm grade specifications and SDS documentation prior to procurement.