Does natural memory foam exist?
How can it be petroleum free when the definition of memory foam says it is a polyurethane?
Memory foam is Polyurethane with additional chemicals increasing its viscosity and density. It is often referred to as “Visco-elastic” polyurethane foam, or low-resilience polyurethane foam. Higher-density memory foam softens in reaction to body heat, allowing it to mold to a warm body in a few minutes. A lower-density memory foam is pressure-sensitive and molds quickly to the shape of a body pressing against it, returning to its original shape once the pressure is removed. The speed with which a foam returns to its original shape after a weight is removed is often part of the marketing message among memory-foam mattress producers, many of whom tout “newer generation” foams with “faster recovery.”
When new, some memory foams give off a distinct chemical odor, which many people find unpleasant and some say is akin to the smell of paint. This odor decreases with airing, but some remain sensitive. Emissions from memory foam mattresses may cause more respiratory irritation than other mattresses.
Memory foam, like other polyurethane products, can be combustible. Laws require all bedding, including memory foam items, be resistant to ignition from an open flame such as a candle or cigarette lighter. There is concern that high levels of the fire retardant, commonly used in memory foam, could cause health problems for users.
Manufacturers caution about leaving babies and small children unattended on a memory foam mattress, as they may find it more difficult to turn and rotate and may suffocate.
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