What is the insulation value of dry fillers?

The lambda value λ (W/mK) is the insulation value of a material. The lower the lambda value, the better the material insulates. The lambda values of most bio-ecological insulation materials fluctuate between 0.035 and 0.040 W/mK. Below are some insulation values of some insulation materials.

Material: Insulating materials from renewable raw materials: λ value W/mK
Paper Flakes 0,035 - 0,040
sheep wool 0,035 - 0,040
wood fibre 0,037 - 0,040
Cork 0,038 - 0,040
Hemp 0,038 - 0,042
seagrass 0,039
coconut fibre 0,040
Cotton 0,042
Straw 0,056
shells 0,106 - 0,155
Material: Insulation materials from mineral raw materials: λ value W/mK
glass wool 0,031 - 0,044
rockwool 0,031 - 0,044
Silicate foam granules 0,040
Cell glass 0,040 - 0,050
perlite 0,051
vermiculite 0,053
Material: Insulation materials from petrochemical raw materials: λ value W/mK
Vacuum insulation panels (VIP) 0,007
PF (rigid foam resol) 0,020 - 0,022
PIR 0,021 - 0,026
PUR 0,023 - 0,028
XPS 0,028 - 0,038
EPS 0,031 - 0,045
Material: Insulation materials from reusable materials: λ value W/mK
Levelling granules 0,090
Aerated concrete granules 0,10 - 0,32

Source: www.lambda.be

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