The best insulation products are created and used with commitment to environmental responsibility and Heraklith wood wool insulation boards are no exception. They are made depending on availability from PEFC certified spruce wood that originates in carefully managed forests. During production, the long, fine spruce and poplar wood are pressed with a mineral bonding agent to create a light, multifunctional insulation board that is easy on the environment in both in its production and use phases.