Thermal conductivity (k) is ability of heat conduction for material. It is heat (Q) transmitted through a unit thickness (x) in a direction normal to a surface of unit area (A) with temperature difference (dT) at steady state conditions.
Thermal conductivity Unit & Conversion
k = (Q/A).x / dT
Thermal conductivity Unit & Conversion
- 1 W/(mK) = 0.85985 kcal/(hr.moC)
- 1 W/(mK) = 0.57779 Btu/(ft.hr oF)
- 1 W/(mK) = 6.9335 Btu.in/(ft2.hr oF)
| Material | 25oC |
| Acetone | 0.16 |
| Acrylic | 0.2 |
| Air | 0.024 |
| Alcohol | 0.17 |
| Aluminum | 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 - 0.33 |
| Benzene | 0.16 |
| Beryllium | 218 |
| Brass | 109 |
| Brick dense | 1.31 |
| Brick work | 0.69 |
| Cadmium | 92 |
| Carbon | 1.7 |
| Carbon dioxide | 0.0146 |
| Carbon Steel | 50 |
| Cement, portland | 0.29 |
| Cement, mortar | 1.73 |
| Chalk | 0.09 |
| Chrome Nickel Steel (18% Cr, 8 % Ni) | 16.3 |
| Clay, dry to moist | 0.15 - 1.8 |
| Clay, saturated | 0.6 - 2.5 |
| Cobalt | 69 |
| Concrete, light | 0.42 |
| Concrete, stone | 1.7 |
| Constantan | 22 |
| Copper | 401 |
| Corian (ceramic filled) | 1.06 |
| Corkboard | 0.043 |
| Cork, regranulated | 0.044 |
| Cork | 0.07 |
| Cotton | 0.03 |
| Cotton Wool insulation | 0.029 |
| Diatomaceous earth (Sil-o-cel) | 0.06 |
| Earth, dry | 1.5 |
| Ether | 0.14 |
| Epoxy | 0.30 - 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 | 0.045 |
| Freon 12 | 0.073 |
| Gasoline | 0.15 |
| Glass | 1.05 |
| Glass, Pearls, dry | 0.18 |
| Glass, Pearls, saturated | 0.76 |
| Glass, window | 0.96 |
| Glass, wool Insulation | 0.04 |
| Glycerol | 0.28 |
| Gold | 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 |
| 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 |
| LPG | 0.23 - 0.26 |
| Magnesia insulation (85%) | 0.07 |
| Magnesite | 4.15 |
| Magnesium | 156 |
| Marble | 2.08 - 2.94 |
| Mercury | 8 |
| Methane | 0.030 |
| Methanol | 0.21 |
| Mica | 0.71 |
| Mineral insulation materials, wool blankets .. | 0.04 |
| Mineral oil | 0.138 |
| Molybdenum | 138 |
| Monel | 26 |
| Mud | 1.3 - 2.6 |
| Neoprene Rubber | 0.3 |
| Nickel | 91 |
| Nitrogen | 0.024 |
| Nylon 6 | 0.25 |
| Oil, machine lubricating SAE 50 | 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 (insulation materials) | 0.03 |
| Platinum | 70 |
| Plywood | 0.13 |
| Polyethylene HD | 0.42 - 0.51 |
| Polypropylene | 0.1 - 0.22 |
| Polystyrene expanded | 0.03 |
| Polyurethane | 0.2 |
| Polyurethane Foam (Dry) | 0.02 - 0.04 |
| Polyurethane Foam (Dry) | 0.4 - 0.6 |
| Porcelain | 1.5 |
| PTFE | 0.25 |
| PVC | 0.19 |
| PVC Foam ((Dry) | 0.040 - 0.044 |
| Pyrex glass | 1.005 |
| Quartz mineral | 3 |
| Rock, solid | 2 - 7 |
| Rock, porous volcanic (Tuff) | 0.5 - 2.5 |
| Rock Wool insulation | 0.045 |
| Sand, dry | 0.15 - 0.25 |
| Sand, moist | 0.25 - 2 |
| Sand, saturated | 2 - 4 |
| Sandstone | 1.7 |
| Sawdust | 0.08 |
| Silica aerogel | 0.02 |
| Silicone oil | 0.1 |
| Silver | 429 |
| Snow (temp <>oC) | 0.05 - 0.25 |
| Sodium | 84 |
| Softwoods (fir, pine ..) | 0.12 |
| Soil, with organic matter | 0.15 - 2 |
| Soil, saturated | 0.6 - 4 |
| Steel, Carbon 1% | 43 |
| Stainless Steel | 16 |
| Straw insulation | 0.09 |
| Styrofoam | 0.033 |
| Syntactic Foam (dry) | 0.09 |
| Syntactic Foam (wet) | 0.3 |
| Tin Sn | 67 |
| Zinc Zn | 116 |
| Urethane foam | 0.021 |
| Vermiculite | 0.058 |
| Vinyl ester | 0.25 |
| Water | 0.58 |
| Wood across the grain, white pine | 0.12 |
| Wood across the grain, balsa | 0.055 |
| Wood across the grain, yellow pine | 0.147 |
| Wood | 0.17 |
| Wool | 0.07 |
Ref :
1) Thermal Conductivity - Huskseflux
2) Thermal Conductivity - NDT Resource
3) Thermal Conductivity Conversion Calculator
4) Thermal Conductivity of Metal
5) Soil Thermal Conductivity
6) Misc. on Thermal Conductivity
7) Thermal Conductivity for Various Material
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