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Physics > Thermal Conductivity

The table below shows the thermal conductivity of common materials at 25°C. The figure in the second column indicates the thermal conductivity, 'k' (W/m K)

The data may be useful in preparing 'thermal insulation' practicals where specific materials need to be chosen for their thermal conductivity properties.

Material Thermal Conductivity, k (W/m K) at 25°C
Acetone 0.16
Acrylic 0.2
Air 0.024
Alcohol 0.17
Aluminium 250
Aluminium Oxide 30
Ammonia 0.022
Argon 0.016
Asphalt 0.75
Balsa 0.048
Bitumen 0.17
Benzene 0.16
Brass 109
Carbon 1.7
Cement, portland 0.29
Cement, mortar 1.73
Chalk 0.09
Cobalt 69
Concrete, light 0.42
Concrete, stone 1.7
Copper 401
Cotton 0.03
Carbon Steel 54
Cotton Wool insulation 0.029
Earth, dry 1.5
Ether 0.14
Epoxy 0.35
Felt insulation 0.04
Fibreglass 0.04
Glass 1.05
Glycerol 0.28
Gold 310
Granite 1.7-4.0
Oak 0.16
Helium 0.142
Hydrogen 0.168
Ice (0 oC, 32 oF) 2.18
Iron 80
Iron, wrought 59
Iron, cast 55
Lead Pb 35
Leather, dry 0.14
Limestone 1.26-1.33
Magnesium 156
Marble 2.6
Mercury 8
Methane 0.030
Methanol 0.21
Mica 0.71
Mineral wool 0.04
Nickel 91
Nitrogen 0.024
Nylon 0.25
Oil, machine 0.15
Olive oil 0.17
Oxygen 0.024
Paper 0.05
Paraffin Wax 0.25
Platinum 70
Plywood 0.13
Polyethylene HD 0.42-0.51
Polypropylene 0.1-0.22
Polystyrene expanded 0.03
Porcelain 1.5
PTFE 0.25
PVC 0.19
Pyrex glass 1.005
Rock Wool insulation 0.045
Sand, dry 0.35
Sand, saturated 2.7
Sandstone 1.7
Sawdust 0.08
Silicone oil 0.1
Silver 429
Snow (temp < 0 °C) 0.05-0.25
Sodium 84
Softwood 0.12
Steel 46
Stainless Steel 16
Styrofoam 0.033
Tin 67
Zinc 116
Water 0.58
Water, vapor (steam) 0.016 (at 125°C)
Wool, felt 0.07