Thermal Properties of Non-Metals

Heat Transfer Engineering and Design
Engineering Metals and Materials
Thermal Conductivity, Heat Transfer Review

Thermal Properties of Non-Metals

Conductivity: Heat transfer occurs at a lower rate across materials of low thermal conductivity than across materials of high thermal conductivity. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation . The thermal conductivity of a material may depend on temperature. The reciprocal of thermal conductivity is called thermal resistivity.

Density: The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

Specific Heat: Is the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).

Material
Conductivity
W/m-°C
Density
kg/m3
Specific Heat
J/kg-°C
ABS-Plastic
0.25
1.014 x 103
1.26 x 103
Acetals
0.3
1.42 x 103
1.5 x 103
Acrylic
0.06
1.19 x 103
1.5 x 103
Alkyds
0.85
2.0 x 103
1.3 x 103
Alumina, 96%
21.0
3.8 x 103
880.0
Alumina, Pure
37.0
3.9 x 103
880.0
Asbestos, Asbestos-sheets
0.166
-
-
Asbestos, Cement
2.08
-
-
Asbestos, Cement-boards
0.74
-
-
Asbestos, Corregated, 4plies/in
0.087
-
-
Asbestos, Felt, 20 lam/in
0.078
-
-
Asbestos, Felt, 40 lam/in
0.057
-
-
Asbestos, Loosely-packed
0.154
520.0
-
Asphalt
0.75
-
-
Bakelite
0.19
-
-
Balsam wool 2.2lb/ft 3
0.04
35.0
-
Beryllia, 99.5%
197.3
-
-
Brick, Building brick
0.69
1.6 x 103
-
Brick, Carborundum brick
18.5
-
-
Brick, Chrome brick
2.32
3.0 x 103
-
Brick, Diatomaceous earth
0.24
-
-
Brick, Face brick
1.32
2.0 x 103
-
Brick, Fireclay
1.04
2.0 x 103
-
Brick, Magnesite
3.81
-
-
Carbon
6.92
-
-
Cardboard, Celotex
0.048
-
-
Cardboard, Corrugated
0.064
-
-
Cement, Mortar
1.16
-
-
Cement, Portland
0.29
1.5 x 103
-
Concrete, Cinder
0.76
-
-
Concrete, Stone 1-2-4 mix
1.37
2.1 x 103
-
Cork, Corkboard,10lb/ft 3
0.043
160.0
-
Cork, Ground
0.043
150.0
-
Cork, Regranulated
0.045
80.0
-
Diamond, Film
700.0
3.5 x 103
2.0 x 103
Diamond, Type IIA
2.0 x 103
-
-
Diamond, Type IIB
1.3 x 103
-
-
Diatomaceous earth
0.061
320.0
-
E-Glass Fiber
0.89
2.54 x 103
820.0
Epoxy, High Fill
2.163
-
-
Epoxy, No Fill
0.207
-
-
Felt, Hair
0.036
265.0
-
Felt, Wool
0.052
330.0
-
Fiber insulating board
0.048
240.0
-
FR4 Epoxy Glass, 1oz Copper
9.11
-
-
FR4 Epoxy Glass, 2 oz Copper
17.71
-
-
FR4 Epoxy Glass, 4oz Copper
35.15
-
-
FR4 Epoxy Glass, no Copper
0.294
1.9 x 103
1.15 x 103
Glass, Borosilicate
1.09
2.2 x 103
-
Glass, Pyrex
1.02
2.23 x 103
837.0
Glass, Window
0.78
2.7 x 103
-
Glass, Wool, 1.5lb/ft 3
0.038
24.0
-
Insulex, dry
0.064
-
-
Kapok
0.035
-
-
Kapton
0.156
-
1.09 x 103
Magnesia, 85%
0.067
270.0
-
Mica
0.71
-
-
Mylar
0.19
-
-
Nylon
0.242
1.1 x 103
1.7 x 103
Phenolic, Paper based
0.277
-
-
Phenolic, Plain
0.519
-
-
Plaster, Gypsum
0.48
1.44 x 103
-
Plaster, Metal lath
0.47
-
-
Plaster, Wood lath
0.28
-
-
Plexiglass
0.19
-
-
Polycarbonate
0.19
1.2 x 103
1.3 x 103
Polyethylene, High density
0.5
950.0
2.3 x 103
Polyethylene, Low density
0.35
920.0
2.3 x 103
Polyethylene, Medium density
0.4
930.0
2.3 x 103
Polystyrene
0.106
-
-
Polyvinyl chloride
0.16
-
-
Pyrex
1.26
-
-
Rock wool, 10lb/ft 3
0.04
160.0
-
Rock wool, Loosely packed
0.067
64.0
-
Rubber, Butyl
0.26
-
-
Rubber, Hard
0.19
-
-
Rubber, Silicone
0.19
-
-
Rubber, Soft
0.14
-
-
Sawdust
0.059
-
-
S-Glass Fiber
0.9
2.49 x 103
835.0
Silica aerogel
0.024
140.0
-
Silicon, 99.9%
150.0
2.33 x 103
710.0
Silicone grease
0.21
-
-
Stone, Granite
2.8
2.64 x 103
-
Stone, Limestone
1.3
2.5 x 103
-
Stone, Marble
2.5
2.6 x 103
-
Stone, Sandstone
1.83
2.2 x 103
-
Styrofoam
0.035
-
-
Teflon
0.22
-
1.04 x 103
Wood Shavings
0.059
-
-
Wood, Cross Grain, Balsa, 8.8lb/ft 3
0.055
140.0
-
Wood, Cross Grain, Cypress
0.097
460.0
-
Wood, Cross Grain, Fir
0.11
420.0
-
Wood, Cross Grain, Maple
0.166
540.0
-
Wood, Cross Grain, Oak
0.166
540.0
-
Wood, Cross Grain, White pine
0.112
430.0
-
Wood, Cross Grain, Yellow pine
0.147
640.0
-
Aluminum-Oxide, Al 2 O 3 , 99.5%
32.0
-
-
Aluminum-Oxide, Al 2 O 3 , 96%
21.5
-
-
Aluminum-Oxide, Al 2 O 3 , 90%
12.0
-
-

Thermal Conductivity Conversions:
1 cal/cm2/cm/sec/°C = 10.63 watts/in - °C

117 BTU/(hr-ft F) x (.293 watt-hr/BTU) x (1.8F/C) x (ft/12 in.) = 5.14 watts/in - °C
or
117 Btu / (hr-ft-F) x .04395 watt-hr-F-ft/(Btu=°C - in) = 5.14 watts/in-°C

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