Manufacturer page.

Expanded polystyrene (EPS) is a common material used for thermal insulation of buildings, including floors, walls and ceilings. It is a polymer foam, consisting of air-filled polystyrene cells. As 98% of the material is air, EPS provides good insulating properties at a low weight. Other characteristics of the material include low moisture absorption, long service life and high compressive strength. EPS is manufactured through permeating polystyrene beads with pentane, allowing the beads to expand when exposed to steam. This addition of a so-called blowing agent adds 4% - 6% w/w. Graphite in small amounts are further added to allow for improved thermal insulation properties. The expanded polystyrene (EPS) beads are then fed into a block molding machine, where steam and pressure form large blocks of EPS. The amount of raw material going into the product determines the density of the block. This LCA is based on pressure class 80, which provides a density at approximately 14,7 kg/m3 of insulation.