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Differences Between High-Density and Medium-Density PU Soft Foam

By Raman Agarwal
April 18, 2024
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In the foam industry, PU (polyurethane) flexible foams are categorized based on their density, measured in KG/M³, which indicates the foam’s weight per cubic meter. These foams are typically classified into three types: high-density, medium-density, and low-density. High-density foam, characterized by its numerous pores and fullness, is commonly used in applications such as sound-absorbing materials, sofa cushions, and soft packaging.

Key Differences Between High-Density and Medium-Density PU Foams

Density Range:

  • High-Density Foam: Foams with a density of ≥45 KG/M³.
  • Medium-Density Foam: Foams with a density ranging from 18 to 45 KG/M³.

Applications:

  • High-Density Foam: Due to its abundant pores and fullness, high-density foam is ideal for sound absorption, sofa cushions, and soft packaging. It offers excellent support and durability.
  • Medium-Density Foam: This foam is generally used for protective materials across various products, offering a balance between comfort and support.

Hardness:

  • High-Density Foam: Typically, higher-density foam means greater hardness. However, some high-density foams can be made extremely soft by incorporating super-soft agents, making them suitable for applications requiring both softness and durability, such as sound absorption and cushioning.
  • Medium-Density Foam: While not as hard as high-density foam, medium-density foam provides adequate support and cushioning, suitable for a range of protective and comfort-based applications.

Uses:

  • High-Density Foam: Known for its ability to absorb external forces, fine texture, and comfort, high-density foam is used in automotive, furniture, healthcare, and toy industries. It is durable and provides excellent support, but is generally not suitable for applications requiring water absorption.
  • Medium-Density Foam: This foam type is versatile and used for general protective materials. It strikes a good balance between softness and support, making it suitable for a wide array of applications.

In summary, high-density PU foam offers superior durability, support, and specific applications like sound absorption and cushioning, while medium-density PU foam provides a balance of comfort and protection suitable for various uses. Understanding these differences helps in selecting the right foam for your specific needs.