Insulating Materials Thermal Properties

Heat Transfer Engineering
Thermodynamics
Engineering Physics

Thermal Properties of insulating materials (at a mean temperature of 24°C)

Material
Thermal
Thickness,
L
mm
Density, ρ
kg/m3
Conductivity, k
W/m·K
Specific Heat,
cp
kJ/kg·K
R-value
(for listed
thickness, L/k),
K·m2/W
Blanket and Batt
Mineral fiber
(fibrous form processed
from rock,
slag,or glass)
50 to 70
mm
4.8–32
0.71–0.96
1.23
75 to 90
mm
4.8–32
0.71–0.96
1.94
135 to 165
mm
4.8–32
0.71–0.96
3.32
Board and Slab
Cellular glass
136
0.055
1.0
Glass fiber
(organic bonded)
64–144
0.036
0.96
Expanded polystyrene
(molded beads)
16
0.040
1.2
Expanded polyurethane
(R-11 expanded)
24
0.023
1.6
Expanded perlite
(organic bonded)
16
0.052
1.26
Expanded rubber
(rigid)
72
0.032
1.68
Mineral fiber
with resin binder
240
0.042
0.71
Cork
120
0.039
1.80
Sprayed or
Formed in Place
Polyurethane
foam
24–40
0.023–0.026
Glass fiber
56–72
0.038–0.039
Urethane, two-part
mixture (rigid foam)
70
0.026
1.045
Mineral wool granules
with asbestos/
inorganic binders
(sprayed)
190
0.046
Loose Fill
Mineral fiber
(rock, slag,
or glass)
~75 to 125 mm
9.6–32
0.71
1.94
~165 to 222 mm
9.6–32
0.71
3.35
~191 to 254 mm
0.71
3.87
~185 mm
0.71
5.28
Silica aerogel
122
0.025
Vermiculite
(expanded)
122
0.068
Perlite,
expanded
32–66
0.039–0.045
1.09
Sawdust or shavings
128–240
0.065
1.38
Cellulosic insulation
(milled paper or wood pulp)
37–51
0.039–0.046
Roof Insulation

Cellular

glass

144
0.058
1.0
Preformed, for
use above deck
13 mm
1.0
0.24
25 mm
2.1
0.49
50 mm
3.9
0.93
Reflective
Insulation
Silica powder
(evacuated)
160
0.0017
Aluminum foil separating
fluffy glass mats; 10–12 layers
(evacuated); for
cryogenic applications (150 K)
40
0.00016
Aluminum foil
and glass paper laminate; 75–150
layers (evacuated);
for cryogenic applications (150 K)
120
0.000017
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