Cellulose based systems for thermal insulation in buildings

The main objective of the project is the development of a modified cellulose material with thermal conductivity characteristic comparable to those of less ecological insulation materials. In the long term, the market share of cellulose based insulating systems is expected to double. The newly developed material would make it possible to get the material approved as insulator in multi-story wood constructions. Indeed, from next year flammable materials will only be approved, only if a suitable non-toxic fire protection agent is used, and if the material remains in the compartment, without collapsing. This issue will play a crucial role, especially in those buildings complying with Eco-standards.

Desired improvements in properties are the following:

  • 10% reduction in thermal conductivity (0.033 W/mK).
  • Preserving the fire protection behavior BKZ 5.3 (according to European classification bS2d0), without the addition of boron compounds and or other substances, with are problematic according to REACH.
  • Achieving better compactness of the material in the compartment, to prevent the disintegration of the insulation material in case of fire. This makes it possible to use Isofloc cellulose in multi-story timber construction.
  • Biocidal additives that are not classified as problematic by REACH in alternative to boron and other classical biocides.
Contact, Partners & Publications

Contact @ Empa
Franziska Grüneberger, Thomas Geiger


isofloc AG (Willi Senn, David Stimm, Michel Alder)


Commission for Technology and Innovation CTI / Innosuise
Project Number 16934.2 PFIW-IW




Status: completed








The CUBE - fixed flocs.