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Polyurethane foam

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– Flexible Polyurethane Foam:
– Produced from the reaction of polyols and isocyanates.
– Provides a cushioning effect due to compression and resilience.
– Commonly used in furniture, bedding, automotive seating, athletic equipment, packaging, footwear, and carpets.

– Rigid Polyurethane Foams:
– Possess low thermal conduction and are used as insulators.
– Have low density compared to metals and good dimensional stability.
– Do not expand on heating like metals.
– Trend towards using renewable raw materials for production.
– Used in vehicles, planes, buildings, and fire-retardant applications.

– Space Shuttles:
– Widely used to insulate fuel tanks on Space Shuttles.
– Requires perfect application due to extreme conditions of liftoff.
Foam loss in over 80% of missions led to the Columbia disaster.
– Superior polyimide foam developed for cryogenic propellant tanks.
– Challenges in application due to protective gear limitations and testing constraints.

– References:
– Flexible Polyurethane Foam information from Polyurethane Foam Association.
– Studies on fracture properties, compressive behavior, and plastic deformation modes of rigid polyurethane foam.
– Research on the effect of foam density on properties.
– Development of rigid polyurethane foam from renewable sources like palm oil and soybean oil.
– Advances in fire-retardant rigid polyurethane foam.

– Categories:
– Polyurethane foam falls under the category of foams and thermal protection.
– NASA highlights the cost-saving and safety benefits of insulating foams.
– Additional resources and references provided for further reading.

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