In the foam industry, PU flexible foams are classified based on density, measured in KG/M3, which represents the weight of the foam per cubic meter. Commonly used foams are categorized structurally into three types: high-density foam, medium-density foam, and low-density foam. High-density foam, characterized by numerous pores and fullness, is frequently used in materials such as sound-absorbing cotton, sofa cushions, and soft packaging.
The differences between high-density and medium-density foams are as follows:
Density Range: Generally, foam with a density of ≥45 is classified as high-density foam, while density ranging from 45 to 18 is considered medium-density foam.
Applications: High-density foam, known for its abundant pores and fullness, is commonly used in applications like sound-absorbing cotton, sofa cushions, and soft packaging. Medium-density foam is typically employed for protective materials in various products.
Hardness: Generally, higher-density foam corresponds to higher hardness. However, some high-density foams may incorporate super-soft agents, making the foam extremely soft, suitable for applications like sound absorption, sofa cushions, and soft packaging. The softness and hardness of foams with the same density can also vary.
Uses: High-density foam possesses features such as the ability to absorb external force, fine and soft texture, and comfort. It finds applications in industries such as automotive, furniture, healthcare, toys, etc., meeting diverse market needs. High-density foam is generally not suitable for water absorption. Medium-density and low-density foams are used for general protective materials.
