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Perlite Insulation
Thermal conductivity - temperature and k-values
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Perlite is a type of volcanic glass that expands four to twenty times its original volume and becomes porous when heated.
Relationship between temperature and thermal conductivity is indicated in the diagram below:
- 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/lboF (387 J/kgK)
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