Visco-elastic, visco-elastic or viscoelastic is a synthetic material developed at NASA around 60. The viscoelastic material is used to counteract the effects of gravity on the takeoff of the spacecraft.The effect of memory foam is a behaviour that present certain materials that exhibit both elastic as viscous properties by deforming.The first uses of the viscoelastic material were in mattresses to hospitals because that relieved the pressure exerted by the body in zones swollen and delicate; around the Decade of the 1990s it was possible to buy mattresses in any shop dedescanso in Spain.The density of foam mattresses viscoelastic is measured in kg/m, this determines that the mattress is harder or softer. Varies between 18 kg/m and 90 kg/m depending upon stiffness desired sleeper (greater greater kg/m is the rigidity and lower porosity of) memory foam). Some of the advantages of the viscoelastic material are that: decreases the muscular and nervous tension, eliminates pressure points, regulates body temperature and optimises blood circulation. There are currently two types of viscoelastic mattresses and are differentiated by the way they are manufactured: hand foamed elviscoelastico, in which a chemical is added to the viscoelastic and reacts to grow, as does not use a mold, grows unlimitedly. Its structure is open pore and once done the process, is cut to the desired extent.
On the other hand, in the moulded viscoelastic performs the same manufacturing process but uses a mold, then the material grows up mold allowing you. Generating a viscoelastic with closed pore or with one pore less than the previous process. This process influences the homogeneity of the density of the viscoelastic. The higher is the density, we will have a greater sense viscoelastic. Pore size also influences the air circulation in the material, in the delespumado case, the movement is faster, in molding it is slower.