Monday, July 6, 2009

Some Physical Properties of Memory Foam




What is memory foam? Memory foam is a special foam called viscoelastic foam made of polyurethane. It consists of various chemical formulations, chemicals increase its impact on the viscosity and density. In general, it is firmer in cool and mild with temperatures warm. The increase in density, the faster it reacts to the body, allowing it to mold the form of a warm body in minutes.

Sometimes called a "slow recovery foam" these foams are sensitive to pressure and take an impression, then return to "normal" when the pressure is removed after the impression of a length of time depending on formulation. Withdrawal Force Deflection (IFD) rating is a measure of the firmness of the foam, or the ability of the foam to "push". The memory foam is usually measured on a scale of 8 to 20. Super soft 10 is IFD IFD is firm and 16. Most mattresses are memory foam in the range of business (IFD IFD 12 to 16), but a semi-firm mattress in the IFD 12 - 14 range is quite comfortable for most people. The IFD is sometimes known as ILD (withdrawal or diversion of charge press), and measured at a certain density of foam.

You will see the IFD / ILD number and a sentence as "the density of 2.8 in the ratings. It is a very important part of the physical description of the memory foam mattress, and where you shop, you should take note that.

As mentioned above, the visco-elastic foam tends to take the form of the person sleeping on the product itself contours of the head and body. This characteristic has made these products very successful because of the additional support anatomical standard, they provide more design mattress. Furthermore, the visco-elastic foam is technically a type of foam cells, but it normally has a low airflow rating. Due to the low airflow viscoelastic foam bedding products opinions tend to feel hot to some people.

This has an advantage if the person is "a cold" or heat needs to sleep comfortably, reducing the need for extra blankets that could restrict the berth of the ability to move in his sleep.

Memory foam and foam mattresses in general, find useful applications in hospitals and patients who are bedridden. In the past these people to lie in bed or on very firm mattresses for long periods without moving regularly, for example after a paralyzing stroke. This pressure stronger bones or bony structures often decreased blood flow, causing damage to pressure, leading to conditions such as ulcers or gangrene. By moving to the foam, with better penetration capacity, patients are more at ease and frequency of these types of events has been significantly reduced. Photobucket

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