Foam
Foam Info: Below is a brief discussion of the two most important properties to consider when selecting foam.
Density: Arguably the most important and most misunderstood property to consider when selecting foam. The density of foam is a result of the chemistry used to make the foam. Density is a measurement of mass per unit of volume, and Foam density is expressed in pounds per cubic foot. Other things held constant, higher density foams will retain its shape longer in use, and therefore provide better support and comfort in service. It is often assumed that higher-density foam must feel harder or firmer than foam that’s low-density. However, this is not necessary true. Knowing the density alone tells us nothing about how the foam will feel. To understand if the foam has a soft/firm feel, we look for a second number, the IFD.
Compression: (IFD) Indentation Force Deflection is measurement of foam firmness and it gives us an idea how much the foam will give when sat on. The IFD measures how much downward force it takes (in pounds) to compress the foam. The take away is this; the higher the IFD number, the firmer the foam. The IFD is expressed as a number between 10 and 80, with 10 being very soft, and 80 being very firm.
