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The lightweighting of auto components is a crucial strategy for OEMs to achieve increasingly challenging CAFÉ requirements. Research from MIT has found that every 10% reduction in passenger vehicle weight reduces fuel consumption by about 7%. Since fuel economy requirements have already increased by 18% from MY 2012 to 2017, the weight savings strategies that are easiest to implement have largely been exhausted. Seating is the largest interior component by weight, but the foam is often overlooked from lightweighting consideration due to the perception that higher weight, higher density seating is an important aspect of the vehicle’s comfort. It has become almost a truism that the physical properties associated with seating comfort -- load bearing, resilience, durability - are directly related to foam density. A new auxiliary blowing agent known chemically as HFO 1233zd(E) is commercially available as Solstice® LBA.