# Thermal Conductivity of Non-metallic Solids

Written by Matt Milbury on . Posted in Tables

The following table lists common materials used in construction and their corresponding thermal conductivity values.  The lambda value (λ) is used to calculate the heat transfer due to conduction. The values below are listed in W/m-K [SI] or BTU/FT-F [US].

These values can be used in our Heat Transfer by Conduction Calculator.

## Table for the Thermal Conductivity of non-metallic solids

 A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Asbestos Cement board 20 0.6 68 0.347 Felt (16 laminations per centimeter) 40 0.057 104 0.033 Fiber 50 0.11 122 0.064 Sheet 20 0.74 68 0.428 50 0.17 122 0.098 Asphalt 20 0.7 68 0.404 Bakelite 20 0.23 68 0.133 Bark 25 0.074 77 0.043 Brick Carborundum 1400 11.1 2,552 6.413 Cement 10 0.34 50 0.196 Common 20 0.38-0.52 68 0.22-0.30 Chrome 100 1.9 212 1.098 Facing 20 1.3 68 0.751 Firebrick 300 0.1 572 0.058 Magnesite (50% MgO) 20 2.68 68 1.548 Masonry 20 0.66 68 0.381 Silica (95% Si02) 20 1.07 68 0.618 Zircon (62% Zr02) 20 2.44 68 1.410 Brickwork, dried in air 20 0.58-0.81 68 0.335-0.468 Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Carbon Diamond (type lib) 20 1350 68 780.016 Graphite (firm, natural) 20 155 68 89.557 Carborundum (SiC) 100 58 212 33.512 Cardboard 0-20 ~0.14 32-68 ~0.081 Celluloid 20 0.23 68 0.133 Cement (portland, fresh, dry) 20 0.3 68 0.173 Chalk (CaC03) 20 2.2 68 1.271 Clay 20 1.28 68 0.740 Fireclay 100 0.5-1.2 212 0.289-0.693 Sandy Clay 20 0.9 68 0.520 Coal 20 0.26 68 0.150 Anthracite 900 0.2 1,652 0.116 Brown coal 900 0.1 1,652 0.058 Bituminous in-situ 0.5-0.7 0.289-0.404 Dust 30 0.12 86 0.069 Concrete, made with gravel, dry 20 1.28 68 0.740 Cinder 24 0.76 75 0.439 Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Cork Board 20 0.042 68 0.024 Expanded 20 0.036 68 0.021 Cotton 30 0.059 86 0.034 Earth Clayey (28% moisture) 20 1.51 68 0.872 Coarse-grained 20 0.59 68 0.341 Diatomaceous 20 0.126 68 0.073 Sandy (8% moisture) 20 1.05 68 0.607 Fiber insulating board 20 0.048 68 0.028 Glass Borosilicate 30 1.09 86 0.630 Fiber 20 0.035 68 0.020 Lead 20 0.7-0.93 68 0.404-0.537 Mirror 20 0.76 68 0.439 Pyrex 60-100 1.3 140-212 0.751 Quartz 20 1.4 68 0.809 Window 20 0.81 68 0.468 Wool 0 0.037 32 0.021 Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Granite 20 2.9 68 1.676 Gypsum 20 0.51 68 0.295 Ice 0 2.25 32 1.300 Kapok 30 0.035 86 0.020 Limestone 100 1.1 212 0.636 Linoleum 20 0.081 68 0.047 Magnezia (85%) 38-204 0.067-0.08 100-400 0.039-0.046 Marble 20 2.8 68 1.618 Mica 20 0.52 68 0.300 Mortar 20 0.93 68 0.537 Paper 20 0.12 68 0.069 Paraffin 30 0.24-0.27 86 0.139-0.156 Plaster 20 0.79 68 0.456 Plexiglas (acrylic) 20 0.184 68 0.106 Polyethylene 20 0.35 68 0.202 Polystyrene 20 0.157 68 0.091 Polyurethane 20 0.32 68 0.185 Polyvinyl chloride (PVC) 20 0.15 68 0.087 Porcelain 95 1.03 203 0.595 Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Quartz 20 1.40 68 0.809 Rubber Foam 20 0.09 68 0.052 Hard (ebonite) 20 0.16 68 0.092 Soft 20 ~0.2 68 ~0.116 Synthetic 20 0.23 68 0.133 Salt (rock salt) 0 7 32 4.045 Sand Dry 20 0.58 68 0.335 Moist 20 1.13 68 0.653 Sandstone 20 1.6-2.1 68 0.924-1.213 Sawdust, dry 20 0.07 68 0.040 Silica stone (85% SiC) 700 1.56 1,292 0.901 Silica aerogel 0 0.024 32 0.014 Silicon 20 153 68 88.402 Silk (artificial) 35 0.049 95 0.028 Slag 20 0.57 68 0.329 Slate Parallel to lamination 20 2.9 68 1.676 Perpendicular to lamination 20 1.83 68 1.057 Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F) Snow, firm 0 0.46 32 0.266 Soil [see also Earth] Dry 15 1 59 0.578 Wet 15 2 59 1.156 Sugar (fine) 0 0.58 32 0.335 Sulfur 20 0.27 68 0.156 Teflon (polytetrafluoroethylene) 20 0.23 68 0.133 Wood, perpendicular to grain Ash 15 0.14-0.3 59 0.081-0.173 Balsa 15 0.05 59 0.029 Cedar 15 0.11 59 0.064 Mahogany 20 0.16 68 0.092 Oak 20 0.17-0.25 68 0.098-0.144 Pine, fir, spruce 20 0.15 68 0.087 Plywood 20 0.11 68 0.064 Wool Sheep 20 0.036 68 0.021 Mineral 50 0.042 122 0.024 Slag 25 0.05 77 0.029 Material Temperature Thermal Conductivity Temperature Thermal Conductivity T (°C) λ (W/m • K) T (°F) λ (BTU/FT • F)