Castor oil glycidyl ether is a liquid organic chemical in the glycidyl ether family. It is sometimes called castor oil triglycidyl ether. It has the theoretical formula C66H116O12 and the CAS number 14228-73-0. The IUPAC name is 2,3-bis[[(E)-12-(oxiran-2-ylmethoxy)octadec-9-enoyl]oxy]propyl (E)-12-(oxiran-2-ylmethoxy)octadec-9-enoate. A key use is acting as a modifier for epoxy resins as a reactive diluent that adds flexibility and improved mechanical properties.