Average value of thermal conductivity at normal pressure and temperature
Material
|
Thermal |
conductivity |
W/m-deg |
Kcal/m-hr-deg |
|
Metals |
|
|
Aluminium |
225 |
193 |
Brass |
107 |
92 |
Copper |
385 |
331 |
Cast
iron |
55-65 |
47-56 |
Steel
|
20-45 |
17-38 |
Silver |
410 |
352 |
Construction
Materials |
|
|
Concrete |
1.20 |
1.03 |
Brick
(masonary) |
0.65 |
0.56 |
Brick
(first clay) |
0.78-1.75 |
05-1.5 |
Earth
|
0.138 |
0.119 |
Furnace
of boiler slag |
0.30 |
0.26 |
Glass
(window) |
0.75 |
0.65 |
Plaster |
0.75-0.95 |
0.65 |
Insulating
materials |
|
|
Asbestos
sheet |
0.17 |
0.146 |
Cork,
felt |
0.05-0.10 |
0.043-0.086 |
Glass
wool |
0.03 |
0.032 |
Saw
dust |
0.07 |
0.06 |
Wood
(Balsa) |
0.052 |
0.045 |
Miscellaneous |
|
|
Air |
0.024 |
0.021 |
Ash |
0.12 |
0.103 |
Ice |
2.25 |
1.935 |
water |
0.55-0.7 |
0.047-0.6 |
Freon |
0.0083 |
0.0096 |
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