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Perlite Insulation K Values

Reference data and engineering information about perlite insulation k values for insulation applications.

perliteinsulationvalues

Overview

Engineering reference data for Perlite Insulation K Values in insulation.

Key Formulas

Thermal Resistance

R=LkAR = \frac{L}{kA}

Resistance to heat flow.

Heat Loss

Q=ΔTRtotalQ = \frac{\Delta T}{R_{total}}

Temperature difference / total resistance.

Variables

SymbolDescriptionUnit
RRThermal resistanceK/W
LLThicknessm
kkThermal conductivityW/(m·K)

Physical Properties

8 rows
Typical Physical Properties of Expanded Perlite
Property
Value
Refractive Index1.5
Free Moisturemaximum 0.5%
pH (of water slurry)6.5 - 8.0
Specific Gravity2.2 - 2.4
Bulk Density (loose weight)2 - 25 lb/ft³ (32 - 400 kg/m³)
Softening Point1600 - 2000 °F (871 - 1093 °C)
Fusion Point2300 - 2450 °F (1260 - 1343 °C)
Specific Heat0.2 Btu/lb·°F (837 J/kg·K)

Source: engineeringtoolbox.com

Useful Conversions

T°C=59(T°F32)T_{\text{°C}} = \frac{5}{9} \left( T_{\text{°F}} - 32 \right) 1 \frac{\text{W}}{\text{m·K}} = 6.935 \frac{\text{Btu·in}}{\text{h·ft^{2}·°F}}

References