The Truth About EPS Expansion: Beyond Bead Size Uniformity

All foaming processes and equipment are fundamentally based on the raw material itself. Whether through reactor suspension or extrusion, inherent variations in particle size distribution are inevitable in the raw resin. This is an objective fact.

Focus on a Uniform Expansion Ratio

Instead of trying to eliminate these natural differences, the priority is to make the expansion ratio uniform across different particle sizes—in other words, to achieve consistent volume growth. This is why pursuing perfectly uniform particle size after expansion can be ineffective.

Evaluate the Molded Result

It is unreasonable to claim that lower density automatically follows from larger beads, or that smaller beads necessarily produce higher density. To evaluate foaming uniformity, the practical measurements are the shape regularity and weight of the closed-mold product after molding.