2012年3月22日星期四
The Story of the Memory Foam Mattress
The story of the memory foam mattress began years ago in the early 1980s as part of a NASA program to find seating alternatives for astronauts who felt distinctly uncomfortable during he first couple of hours of take-off as their bodies grappled with the changed gravitational forces. Scientists came up with various experimental materials varying in density and thickness that seemed malleable and could conform to the contours of the body but were elastic enough to get back to their original form. The best out of all the tried materials was visco-polyurethane foam or what remote controlled air swimmers came to be known as memory foam. Made out of a combination of chemicals and polyurethane, memory foam has a high level of density and viscosity, which give it the ability to mold itself according to the body and also change according angry bird to the temperature requirements. Above all, it remains soft, so much so that the impression of the hand placed on it, stays long after the hand has been removed.NASA sold the formulae commercially to enable the public to benefit from their unique find. Initially, memory foam was manufactured in very limited quantities and had limited demand as well, and was therefore, extremely expensive. The first products made were for medical and sports use. Over time, cheaper methods of manufacturing the foam were evolved and now it is available extensively and is also considerably cheaper. While some cheaper varieties may not be as effective in providing the comfort that traditional memory foam mattresses are supposed to provide, most of them are popular and really sought after in the U.S. and Singapore. The number of customers ordering memory foam mattresses online from websites offering the product is unbelievable. The orders are often combined with other memory foam products like pillows and mattress toppers.Memory Foam Mattresses are a healthier product to Syma s107 upgrade use, as they are dust mite and bacteria resistant. They are more suitable then for people suffering from allergies. Their open cell structure helps to make them adapt to the human form. The best results come from those having the right thickness, density and viscosity. They have a long life and that justifies the expense of buying one. Cheaper mattress would have to be bought and discarded a number of times to last as long as one memory foam mattress. They are probably the best in the market yet.
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