polyurethane flexible foam is a cellular polymer formed through the reaction of a polyol (typically a polyester or polyether polyol) with an isocyanate, usually toluene diisocyanate (tdi) or methylene diphenyl diisocyanate (mdi), in the presence of water, catalysts, surfactants, and other additives. the reaction produces both urethane linkages and carbon dioxide gas, which acts as...

polyurethane (pu) rigid foam is a widely used insulation material in the appliance industry, known for its excellent thermal insulation properties, lightweight nature, and structural strength. efficient and consistent foam formation is crucial for achieving optimal insulation performance. catalysts play a critical role in controlling the chemical reactions involved in pu rigid foam production. pc-8...