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Thermal Conductivity & Coefficient of Expansiona
Substance
Thermal Conductivity (W/cm·°C)
Coefficient of Thermal Expansion (ppm/°C)
Density (g/cm3)
Specific Thermal Conductivityb (W/cm·°C)
Air (still)
0.0003
Alumina
0.276
Alumina (85%)
0.118
Aluminum
2.165
0.23
2.7
0.81
Beryllia (99.5%)
1.969
Beryllia (97%)
1.575
Beryllia (95%)
1.161
Beryllium
1.772
Beryllium-Copper
1.063
Boron Nitride
0.394
Brass (70/30)
1.220
Copper
3.937
0.17
8.9
0.45
Copper/Invc/Copper
1.64
0.084
8.4
.020
Copper/Mod/Copper
1.82
0.060
9.9
0.18
Copper/Mod-Cu/Copper
2.45-2.80
0.60-0.10
9.4
0.26-0.30
Diamond (room temp)
6.299
Epoxy
0.002
Epoxy (thermally conductive)
0.008
FR-4 (G-10)
0.003
GaAs
0.591
Glass
0.008
Gold
2.913
Heatsink Compound
0.004
Helium (liquid)
0.000307
Invar
0.11
0.013
8.1
0.014
Iron
0.669
Kovar
0.17
0.59
8.3
0.020
Lead
0.343
Magnesium
1.575
Mica
0.007
Molybdenum
1.299
Monel
0.197
Mylar
0.002
Nickel
0.906
Nitrogen (liquid)
0.001411
Phenolic
0.002
Platinum
0.734
Sapphire (a-axis)
0.32
Sapphire (c-axis)
0.35
Silicon (pure)
1.457
Silicon (0.0025 W-cm)
1.457
Silicon Carbide
0.90
Silicon Dioxide (amorphous)
0.014
Silicon Dioxide (quartz, a-axis)
0.059
Silicon Dioxide (quartz, c-axis)
0.11
Silicone Grease
0.002
Silicone Rubber
0.002
Silicon Nitride
0.16 - 0.33
Silver
4.173
Stainless Steel (321)
0.146
Stainless Steel (410)
0.240
Steel (low carbon)
0.669
Teflon
0.002
Tin
0.630
Titanium
0.219
0.086
4.4
0.016
Tungsten
1.969
Water
0.0055
Zinc
1.024
a: Approximate values from 0 °C to 100 °C b: Thermal conductivity divided by specific gravity (introduced by Dr. Carl Zweben & K.A. Schmidt) c: Invar d: Molybdenum
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