Fomrez UL-38 catalyst Dioctyltin carboxylate OSI Specialties Catalyst / Accelerator >> Organometallic Polyurethane In urethane applications, this catalyst acts as a slightly delayed action product that can be used at approximately the same level as DBTDL in reaction-injection molded (RIM) formulations, microcellular elastomers for the manufacture of shoe soles and automotive products. Dioctyltin Carboxylate Dioctyltin carboxylate catalyst. Used in urethane applications.