EPS foam by its nature is mostly air, and depending on the density of the foam, there will be more or less air between the fused closed cell beads of EPS. The higher the density, the more beads and consequently the less space for air between the beads.
There is some confusion between water absorption with EPS foam and fusion of the beads. Because of the porosity of the foam, the water absorption is a product of how much air or space there is between the closed cell beads of EPS. It is therefore possible to have foam that has low water absorption and poor fusion, which makes for a poor quality product for use as a surfboard or paddleboard product.
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