Expanded polystyrene panel enriched with graphite particles. The iconic silver-grey colour conceals a nanotechnology upgrade that blocks thermal radiation, exceeding standard white polystyrene efficiency by 20% at equal thickness.
ETICS cladding stratigraphy. Graphite particles inside the panel act as micro-mirrors against infrared radiation, lowering the Lambda value to 0.030 W/mK.
Graphite EPS is the undisputed king of the modern external insulation system (ETICS). Combining the extreme lightness of trapped air with the reflective efficiency of graphite, it allows facade thicknesses to be reduced, cutting costs and structural volumes.
White expanded polystyrene (traditional EPS) effectively curbs conduction and convection by trapping air in closed cells, but is transparent to infrared radiation. The innovation of graphite EPS lies in encapsulating microscopic graphite particles inside the polymer beads during steam expansion. These particles act as millions of micro-mirrors, absorbing and reflecting radiant heat: the result is insulation 20% higher at equal thickness.
Its extraordinary ability to absorb thermal energy is also its limitation on site. If exposed to the sun before the base coat, the grey panel rapidly overheats to 80 degrees C, causing expansion that can detach the adhesive beneath. It is vital to install it with shading nets or to opt for latest-generation versions with a reflective white surface layer (EPS Reflex).
European and international references applicable.
EPS (white or graphite) must never contact the ground: the first 30cm of facade above pavement level must use XPS (extruded), which alone resists the moisture from splashing rainwater and capillary rise without degrading.
The prime application. Panels glued and dowelled to the exterior of masonry walls to eliminate thermal bridges.
PRC.01 · Open the processRigid panels inserted between the structural wall and the inner plasterboard or brick leaf.
PRC.31 · Open the processHigh-density versions (EPS 150/200) used under waterproofing membranes or under roof tiles.
PRC.05 · Open the processSIP systems where EPS acts as the insulating core between two OSB structural panels.
PRC.50 · Open the processThickness needed to achieve a thermal transmittance U = 0.20 W/m2K (nZEB level) applied to a double solid brick wall. A lower bar means less material needed: graphite EPS saves 4 cm of precious facade depth vs standard EPS, translating into more usable interior area and lower drilling depths for anchors.
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