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Memory foam mattress is just a sort of bed that's made from polyurethane. Besides memory, it is also produced from other types of compounds. The compounds which can be put into the bed foams allows the ability to increase in density to it. Memory foam mattress can also be called visco elastic polyurethane foam. The mattress was developed so that you can meet with the desire of the bed buyers. The history of the Memory Foam Mattress might be traced back again to the Ames Research Center of NASA. NASA's Ames Research Center backed a project to create a mattress foam that will help to ease back pain of the astronauts due to g forces inside the 1970s. NASA thought the foam material should be applied to comply with the form of the human body. Anyone would ultimately move out of the position, although creating a form for that body can help to fix the situation. On the body, improper pressure points will soon be created consequently. Later, a way to develop a foam that will evolve the the body's appearance was discovered by the research staff from the Ames Research Center of NASA. It is a elastc foam that may consistently spread the body's weight for the foam surface. The discovery triggered Fagerdala World Foams of Sweden to try out it and sell the customers it. In 1991, a business located in Sweden, Tempur Pedic bought the people the research mattresss foam in Sweden. After that, Tempurpedic sold the memory mattress foam towards the people that reside in Canada and Usa. Tempur Pedic's bed became extremely popular. The achievement of Tempur Pedic had caused the producers to make their particular variations of foam beds and promote them for the local customers. Polyurethane foam material is employed because the foam memory. The mattress manufacurers can incorporate several kinds of chemicals to alter the occurrence of the foam. After the chemical is added, the foam can have higher density. Besides, the manufacturer will put in a viscoelastic foam material. The viscoelastic foam is non-toxic. The foam fat is detemined by how much compounds are employed within the foam's production process. Many polyurethane foam mattress has a weight of 4 - 5lb. Lighter memory foam mattress weight inbetween 2 - 3 lb.