The highly insulating grouting material for geothermal energy systems is suited for the use in underground energy storage devices, in order to prevent heat loss in the area around the borehole.


  • Low thermal conductivity of 0.1 W/m/K
  • Heat-resistant up to 90 °C (independent certificate)
  • Classified as safe according to groundwater hygiene requirements

Mixture recommendation:
For 1 m³ groutable suspension:
Use 690 l of water for 520 kg of STÜWA ISO®. The suspension density is at 1.21 kg/dm³

Packaging unit:
In sacks of 25 kg each, 40 sacks 1,000 kg on Euro-pallet