Perlite Insulation

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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/lb^oF (387 J/kgK)
   

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