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A unique low density, water-blown MDI polyurethane foam chemistry has been developed for U.S. Automotive Seating. This breakthrough technology is competitive with incumbent TDI seating systems and can be processed in existing production tools and machinery. Contrary to previously available MDI-based products, this new technology yields densities and Indentation Load Deflections (ILDs) equivalent to what is commonly available with TDI. In addition, a wide firmness range can be achieved by merely changing index, thus eliminating the need for more expensive filled polyols, and multiple systems. A single MDI system can thus be used to produce seat backs, cushions, and dual firmness parts.