Polyurethane foams are characterized by a wide variety of polymer structures that address a broad range of commercial needs. The catalysts for polyurethane foams include gelling catalysts, blowing catalysts, cyclotrimerization catalysts, oxazolidone catalysts, and carbodiimide catalysts. Tin catalysts promote mainly curing reactions and they are considered “gelation catalysts.” In contrast, tertiary amine catalysts accelerate mainly the foaming reaction, which generates and they are considered “blowing catalysts.” Both the gelling and the blowing reaction are profoundly influenced by the type and level of catalyst selected. Catalyst selection influences the overall reactivity of the foam system, and the selectivity toward specific reactions. Reactivity of the system is measured by pot-life time for the system, the cure profile, and the demold (cure) time. Catalyst selectivity impacts the reaction balance, type, and order of polymer linkages formed, as well as the flowability of the foam system. Catalysts also affect the ultimate physical and mechanical properties of the resultant foam. Nik PU supplies some amine catalysts, such as PC-8, A33, A1, T-9 and etc.