High density foam is just your typical foam. It does not conform to your body when it heats up like memory foam does.
A memory foam pillow is made with visco-elastic polyurethane. The higher density foam will shape according to your body heat. Lower density foam shapes itself from the pressure of your body.
Many companies offer memory foam mattresses, which may vary in quality. The following guide provides simple tips for finding a high quality memory foam mattress. When looking for a memory foam mattress, look for information on the density of the foam. Lower density foam is often cheap and low quality, while higher density foam provides a more comfortable sleeping experience. A high quality mattress should contain at least 6 inches of high density memory foam, with lighter foam layered on top. When buying a mattress, make sure that the foam is genuine memory foam. Squeeze a sample, and see how long it takes to expand. If the foam expands to it's original shape in less than a second, it's not memory foam.
Tempurpedic is a patented trademark name for foam mattresses that offer body temperature regulation. Memory foam is the most generic of these terms, and 'visco' is a specific type of high-grade. dense memory foam.
Memory foam is polyurethane with additional chemicals increasing its viscosity and density. A lower density memory foam is pressure sensitive and molds quickly to the shape of a body pressing against it, returing to its original shape once the pressure is removed.
Polystyrene is a plastic that can be made into many products, which can be dense, or can be in the form of a low density foam, called Styrofoam.
From the name it seems that 2.5 is the answer. 2 and 1/2lbs per cubic foot of material. What is considered good quality memory foam is usually 5.0 or more.
From my reseach a memory foam mattress costs ranges between 200 and 300 dollars. It also depends on the different sizes of the bed and where you get it
Memory foam is made from chemically-altered polyurethane that reacts to body heat, allowing the pillow to form to the users unique shape. The polyurethane used is of a higher density than normal, an attribute that results in the memory-foam keeping its shape, rather than returning to it's original form.
Memory foam is made up of a polyurethane foam material with is molded into a form of a mttress, pillow, and so on.
Memory Foam forms and shapes itself to the pressure points in a person's back, offering a higher level of comfort over spring-based mattresses.
Twin memory foam mattress toppers generally cost between $40 for a thin 1 inch topper to $80-$100 for a high density 4 inch topper. Average costs are about $60-$70 for a budget friendly quality mattress topper.
Instead of purchasing a complete cushion made out of memory foam, it is possible to add one or two memory foam toppers to a regular foam cushion. This will give the support but will not be as hot or as prone to permanent indentations as memory foam.