Memory foam

Memory foam consists mainly of polyurethane as well as additional chemicals increasing its viscosity and density. It is often referred to as 'viscoelastic' polyurethane foam, or low-resilience polyurethane foam (LRPu). The foam bubbles or ‘cells’ are open, effectively creating a matrix through which air can move. Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes. Newer foams may recover more quickly to their original shape. Memory foam consists mainly of polyurethane as well as additional chemicals increasing its viscosity and density. It is often referred to as 'viscoelastic' polyurethane foam, or low-resilience polyurethane foam (LRPu). The foam bubbles or ‘cells’ are open, effectively creating a matrix through which air can move. Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes. Newer foams may recover more quickly to their original shape. Memory foam was developed in 1966 under a contract by NASA's Ames Research Center to improve the safety of aircraft cushions. The temperature-sensitive memory foam was initially referred to as 'slow spring back foam'; most called it 'temper foam'. Created by feeding gas into a polymer matrix, the foam has an open-cell solid structure that matches pressure against it, yet slowly springs back to its original shape. Later commercialisation of the foam included use in both medical equipment such as X-ray table pads and sports equipment such as American / Canadian football helmet liners. When NASA released memory foam to the public domain in the early 1980s, Fagerdala World Foams was one of the few companies willing to work with the foam, as the manufacturing process remained difficult and unreliable. Their 1991 product, the 'Tempur-Pedic Swedish Mattress' eventually led to the mattress and cushion company, Tempur World. Memory foam was subsequently used in medical settings. For example, it was commonly used in cases where the patient was required to lie immobile in their bed on a firm mattress for an unhealthy period of time. The pressure on some of their body regions impaired the blood flow to the region, causing pressure sores or gangrene. Memory foam mattresses significantly decreased such events. Claims have also been made that memory foam reduces the severity of pain associated with fibromyalgia.