There are a variety of catalysts used for polyurethane rigid foam reactions and gel reactions, some examples of which are listed below: Foaming reaction catalysts: Organotin compounds, such as ethylenetrimethylene tin (T-9) and ethylenetriethyltin (T-12). Organotin-cobalt composite catalysts, such as ethylenetrimethyltin-cobalt (T-9/Co). Organotin-acid catalysts, such as ethylenetrimethyltin-benzoic acid (T-9/BzOH). Phosphate catalysts such as triphenylphosphine (TPP)...

I. What is a catalyst? A catalyst is a substance that speeds up the process of a chemical reaction, but is not involved in the chemical reaction itself. The addition of a catalyst can increase the efficiency of a chemical reaction by greatly reducing the time and temperature required for it to reach equilibrium. Classification...