Perlite Insulation

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 heated.

Relationship 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/lboF (387 J/kgK)
     

Related Topics

  • Heat Loss and Insulation - Heat loss from pipes, tubes and tanks - with and without insulation - foam, fiberglass, rockwool and more
  • Insulation - Heat transfer and heat loss from buildings and technical applications - insulation methods and coefficients to reduce energy consumption
  • Heat Loss and Insulation - Steam and condensate pipes - heat loss uninsulated and insulated pipes, insulation thickness and more

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