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Thermal
Conductivity
The graphical data shown in this leaflet is derirved from tests based
on ASTM C201 method, which is the recommended test method for fibrous
products by the European Federation of manufacturers of refractory
products. Non-Air atmospheres can exert a marked influence on the
effective conductivity. We therefore recommend that the use of Ceramic
Fibre in special atmospheres is discussed with our sales /application
engineers. An interesting feature is the trend of decreasing
conductivity with increasing fibre density for the same grade of
ceramic fibre. This holds up to a density of about 300 kg/m3,
remaining constant to around 400 kg/m3. The explanation lies in the
fact that measured values are total conductivities representing the
combined heat transfer from radiation, convection, and conduction (of
fibre and air) through the highly porous material. The relative
importance of individual modes varies both with temperature and fibre
density. |
