EPS Particles are widely used in many fields. There is a close internal connection between their density and compression strength, which profoundly affects the performance and application scope of the product.
First of all, from the microstructure of the material, the density of EPS Particles largely determines its internal pore structure. Low-density EPS Particles tend to have larger pore size and higher porosity. This structure makes the pores easy to deform and collapse when the particles are under pressure, resulting in lower compression strength. For example, in some packaging applications, although low-density EPS Particles are light in weight, they are easy to lose their shape when squeezed by heavier objects and cannot provide sufficient protection for the objects.
In contrast, high-density EPS Particles have a smaller and uniform pore structure. The pore wall is relatively thick, which provides stronger support for the particles. When compressed by external force, the pore wall can more effectively resist deformation, thereby showing higher compression strength. In the field of building insulation, EPS materials are required to have a certain compressive resistance to withstand external pressure and load, so high-density EPS Particles are usually selected to ensure the structural stability and durability of the product.
Further research found that there is no simple linear relationship between density and compression strength. As density gradually increases, compression strength will show a curve change that first rises rapidly and then the rising trend gradually slows down. In the low-density stage, a small increase in density can significantly improve the compression strength, because the improvement of the pore structure at this time has a significant effect on the overall strength. When the density reaches a certain level, the effect of continuing to increase the density on the compression strength gradually weakens, because the pore structure is relatively stable at this time, and other factors such as material uniformity begin to have a greater impact on the compression strength.
In addition, factors such as production process and additives can also interfere with this relationship. Different foaming processes will lead to differences in the pore structure of EPS Particles, and their compression strength may be different even at the same density. The addition of certain additives can change the internal structure of the particles or enhance the strength of the pore wall, thereby changing the inherent relationship between density and compression strength to a certain extent. For example, adding an appropriate amount of reinforcing fiber can improve the compression strength of EPS Particles, so that better compression resistance can be obtained at lower density, broadening the application potential of EPS Particles in different fields, and providing more possibilities and flexibility for its product design and performance optimization.
