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Engineering ToolBox > Thermal Conductivity of some common Materials
Thermal conductivity is the quantity of heat transmitted through a unit thickness in a direction normal to a surface of unit area, due to a unit temperature gradient under steady state conditions.
Thermal conductivity, or heat transfer coefficients, of some common materials and products can be found in the table below:
| Thermal Conductivity - k - (W/m K) | |||
| Material/Substance | Temperature (oC) | ||
| 25 | 125 | 225 | |
| Acetone | 0.16 | ||
| Acrylic | 0.2 | ||
| Air | 0.024 | ||
| Alcohol | 0.17 | ||
| Aluminum | 250 | 255 | 250 |
| Aluminum Oxide | 30 | ||
| Ammonia | 0.022 | ||
| Antimony | 18.5 | ||
| Argon | 0.016 | ||
| Asbestos-cement board | 0.744 | ||
| Asbestos-cement sheets | 0.166 | ||
| Asbestos-cement | 2.07 | ||
| Asbestos, loosely packed | 0.15 | ||
| Asbestos mill board | 0.14 | ||
| Asphalt | 0.75 | ||
| Balsa | 0.048 | ||
| Bitumen | 0.17 | ||
| Benzene | 0.16 | ||
| Beryllium | 218 | ||
| Brass | 109 | ||
| Brick dense | 1.31 | ||
| Brick work | 0.69 | ||
| Cadmium | 92 | ||
| Carbon | 1.7 | ||
| Cement, portland | 0.29 | ||
| Cement, mortar | 1.73 | ||
| Chalk | 0.09 | ||
| Cobalt | 69 | ||
| Concrete, light | 0.42 | ||
| Concrete, stone | 1.7 | ||
| Constantan | 22 | ||
| Copper | 401 | 400 | 398 |
| Corian (ceramic filled) | 1.06 | ||
| Corkboard | 0.043 | ||
| Cork, regranulated | 0.044 | ||
| Cork, ground | 0.043 | ||
| Cotton | 0.03 | ||
| Carbon Steel | 54 | 51 | 47 |
| Cotton Wool insulation | 0.029 | ||
| Diatomaceous earth (Sil-o-cel) | 0.06 | ||
| Earth, dry | 1.5 | ||
| Ether | 0.14 | ||
| Epoxy | 0.35 | ||
| Felt insulation | 0.04 | ||
| Fiberglass | 0.04 | ||
| Fiber insulating board | 0.048 | ||
| Fiber hardboard | 0.2 | ||
| Fireclay brick 500oC | 1.4 | ||
| Foam Glass | 0.042 | ||
| Gasoline | 0.15 | ||
| Glass | 1.05 | ||
| Glass, Pearls, dry | 0.18 | ||
| Glass, Pearls, saturated | 0.76 | ||
| Class, window | 0.96 | ||
| Glass, wool Insulation | 0.04 | ||
| Glycerol | 0.28 | ||
| Gold | 310 | 312 | 310 |
| Granite | 1.7 - 4.0 | ||
| Gypsum or plaster board | 0.17 | ||
| Hairfelt | 0.05 | ||
| Hardboard high density | 0.15 | ||
| Hardwoods (oak, maple..) | 0.16 | ||
| Helium | 0.142 | ||
| Hydrogen | 0.168 | ||
| Ice (0oC, 32oF) | 2.18 | ||
| Insulation materials | 0.035 - 0.16 | ||
| Iridium | 147 | ||
| Iron | 80 | 68 | 60 |
| Iron, wrought | 59 | ||
| Iron, cast | 55 | ||
| Kapok insulation | 0.034 | ||
| Kerosene | 0.15 | ||
| Lead Pb | 35 | ||
| Leather, dry | 0.14 | ||
| Limestone | 1.26 - 1.33 | ||
| Magnesia insulation (85%) | 0.07 | ||
| Magnesium | 156 | ||
| Marble | 2.6 | ||
| Mercury | 8 | ||
| Methane | 0.030 | ||
| Methanol | 0.21 | ||
| Mica | 0.71 | ||
| Mineral wool blanket | 0.04 | ||
| Molybdenum | 138 | ||
| Monel | 26 | ||
| Nickel | 91 | ||
| Nitrogen | 0.024 | ||
| Nylon 6 | 0.25 | ||
| Oil, machine | 0.15 | ||
| Olive oil | 0.17 | ||
| Oxygen | 0.024 | ||
| Paper | 0.05 | ||
| Paraffin Wax | 0.25 | ||
| Perlite, atmospheric pressure | 0.031 | ||
| Perlite, vacuum | 0.00137 | ||
| Plaster, gypsum | 0.48 | ||
| Plaster, metal lath | 0.47 | ||
| Plaster, wood lath | 0.28 | ||
| Plastics, foamed | 0.03 | ||
| Plastics, solid | |||
| Platinum | 70 | 71 | 72 |
| 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 | ||
| Quarts mineral | 3 | ||
| Rock Wool insulation | 0.045 | ||
| Sand, dry | 0.35 | ||
| Sand, saturated | 2.7 | ||
| Sandstone | 1.7 | ||
| Sawdust | 0.08 | ||
| Silica aerogel | 0.02 | ||
| Silicone oil | 0.1 | ||
| Silver | 429 | ||
| Snow (temp < 0oC) | 0.05 - 0.25 | ||
| Sodium | 84 | ||
| Softwoods (fir, pine ..) | 0.12 | ||
| Steel | 46 | ||
| Stainless Steel | 16 | 17 | 19 |
| Straw insulation | 0.09 | ||
| Styrofoam | 0.033 | ||
| Tin Sn | 67 | ||
| Zinc Zn | 116 | ||
| Urethane foam | 0.021 | ||
| Vermiculite | 0.058 | ||
| Vinyl ester | 0.25 | ||
| Water | 0.58 | ||
| Water, vapor (steam) | 0.016 | ||
| Wood across the grain, white pine | 0.12 | ||
| Wood across the grain, balsa | 0.055 | ||
| Wood across the grain, yellow pine | 0.147 | ||
| Wood, oak | 0.17 | ||
| Wool, felt | 0.07 | ||