Perlite Insulation

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Thermal conductivity - temperature and k-values

Perlite is a type of volcanic glass that expands four to twenty times its original volume and becomes porous when it is heated.

The relation between temperature and thermal conductivity is indicated in the diagram below:

perlite insulation temperature k values

T(^oC) = 5/9[T(^oF) - 32]

Refractive Index : 1.5
Free Moisture : Maximum 0.5%
pH (of water slurry) : 6.5 - 8.0
Specific Gravity : 2.2 - 2.4
Bulk Density (loose weight) : depending on the expansion process but usually in the 2-25 lb/ft³ range (32-400 kg/m³)
Softening Point : 1600-2000^oF (871-1093^oC)
Fusion Point : 2300-2450^oF (1260-1343^oC)
Specific Heat : 0.2 Btu/lb^oF (387 J/kgK)

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