If the foam in your sofa cushions is not up to the mark, it can start to disintegrate and lose its softness in a short time. The sagging cushions can make the entire furniture look old and tired, and also make it uncomfortable for sitting. Replacing the foam is the best quick fix solution. To be familiar with the basics, foam is measured in two standards: density and compression. Density refers to the amount of material in one cubic foot; the more the density, the more the cubic foot will weigh. Compression refers to the amount of force required to compress the cubic foot by 25 percent. These are the basics of a typical foam. It is available in multitudes of grades which can indicate the expected number of years of wear and different stages of firmness in a wide range of price list. It is also used to make upholstery . Foam is also rated by the expected years of use. Some products are also rated as high resilience, which means high-quality cushion foam with a density of 3 ...