The lambda-value λ (W / mK) is the insulation of a material. The lower the lambda-value, the better insulates the material. The lambda-values of the most bio-ecological insulation vary between 0.035 and 0.040 W / mK.
Insulation value of some insulation materials:
Insulation from renewable raw materials λ
Flax 0,038 W/mK
Hemp 0,040 à 0,042 W/mK
Paper flakes 0,039 W/mK
Wood fiber 0,037 à 0,040 W/mK
Cork 0,038 à 0,040 W/mK
Sheepswool 0,035 W/mK
Insulation of mineral raw materials λ
Perlite 0,051 W/mK
Vermiculite 0,053 W/mK
Cellular glass 0.040 à 0.050 W/mK
Silicat-foam granules 0.040 W/mK
Glasswool 0,032 à 0,040 W/mK
Rockwool 0,035 à 0,040 W/mK
Insulation from petrochemical raw materials λ
EPS 0,033 à 0,042 W/mK
XPS 0,029 à 0,038 W/mK
PF 0,020 W/mK
PUR 0,023 à 0,032 W/mK
PIR 0,023 à 0,032 W/mK