Within the industry, sponge foam is typically classified according to its density. In the market, you can commonly find two primary categories of sponge foam: high-density sponge foam and regular sponge foam. These two types are easily distinguishable by their appearance and texture.
High-density sponge foam exhibit qualities such as excellent elasticity, uniform thickness, light weight, and consistent quality. Density is measured in KG/M3, representing the weight of the sponge foam per cubic meter. A piece of sponge foam with a density equal to or greater than 45 is considered high-density, while densities between 45 and 18 fall into the medium-density category, and those below 18 are considered low-density. However, due to technological advancements, weight alone is no longer the sole reliable criterion.
The quality of a sponge foam primarily hinges on two key factors: high density and rebound resilience:
The elasticity of high-density sponge foam directly affects its comfort. Sofas constructed with high-rebound sponge foam offers substantial elasticity and excellent rebound resilience. This provides superior body support and a comfortable experience when sitting or lying on them. In contrast, lower-quality sponge foam tends to lack rebound, resulting in hardness and discomfort over time.
High-quality high-rebound sponge foam possess outstanding rebound resilience, quick recovery, and increased durability. In contrast, lower-quality sponge foam may suffer from sagging issues after just one or two years of use, leading to a shorter lifespan. High-density sponge foam also offer exceptional breathability, minimal relaxation loss, a high compression load ratio, and good flame resistance. They demonstrate better performance in terms of thermal aging, resistance to moisture-induced aging, and dynamic fatigue.
