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The higher the density of polystyrene, the denser and more stable its cell structure, which directly leads to higher compressive strength and load-bearing capacity. Styro Stones foams polystyrene/Neopor with a density of >25g/l, resulting in an average compressive strength of 120 kPa.

The bulk density also determines the u-value/R-value of the Styrofoam or the improved Neopors used by Styro Stone.

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