Tributyl citrate

Tributyl citrate (TBC) is a citric acid triester with the molecular formula C18H32O7, registered under CAS 77-94-1 and EC 201-071-2. It is commercially available under trade names including Citroflex 4 and Citroflex C 4, and carries no assigned E-code despite food-contact approval in several jurisdictions.

In PVC and polymer processing, TBC functions as a primary plasticizer by intercalating between polymer chains to reduce glass transition temperature and improve flexibility. In food packaging and personal care formulations, it acts as a heat stabilizer and emollient, respectively, slowing oxidative degradation and supporting skin-conditioning performance without contributing odor.

Tributyl citrate is supplied in food-grade and technical-grade liquid form, with compliance documentation available against FCC and REACH requirements. Standard packaging includes IBC containers and bulk tankers. Procurement teams should confirm grade specification against intended application, as food-contact use requires additional purity certification.