Fomrez UL-38 catalyst dioctyltin carboxylate Crompton-OSI Specialties Catalysts / Accelerators / Vulcanizing agents >> Organometallics PU - Prepolymers 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, reaction-injection molded (RIM) formulations and microcellular elastomers for the manufacture of shoe soles and automotive products.