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Surface Emissivity Coefficients

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The emissivity coefficient - ε - indicates the radiation of heat from a 'grey body' according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal 'black body' with the emissivity coefficient ε = 1.

The emissivity coefficient - ε - for some common materials can be found in the table below. Note that the emissivity coefficients for some products varies with the temperature. As a guideline the emmisivities below are based on  temperature 300 K.

Surface Emissivity Coefficients
Surface MaterialEmissivity Coefficient
- ε -
Alloy 24ST Polished 0.09
Alumina, Flame sprayed 0.8
Aluminum Commercial sheet 0.09
Aluminum Foil 0.04
Aluminum Commercial Sheet 0.09
Aluminum Heavily Oxidized 0.2 - 0.31
Aluminum Highly Polished 0.039 - 0.057
Aluminum Anodized 0.77
Aluminum Rough 0.07
Aluminum paint  0.27 - 0.67
Anodize black 0.88
Antimony, polished 0.28 - 0.31
Asbestos board  0.96
Asbestos paper 0.93 - 0.945
Asphalt 0.93
Basalt 0.72
Beryllium 0.18
Beryllium, Anodized 0.9
Bismuth, bright 0.34
Black Body Matt 1.00
Black lacquer on iron 0.875
Black Parson Optical 0.95
Black Silicone Paint 0.93
Black Epoxy Paint 0.89
Black Enamel Paint 0.80
Brass Dull Plate 0.22
Brass Rolled Plate Natural Surface 0.06
Brass Polished 0.03
Brass Oxidized 600oC 0.6
Brick, red rough 0.93
Brick, fire-clay 0.75
Cadmium 0.02
Carbon, not oxidized 0.81
Carbon filament 0.77
Carbon pressed filled surface 0.98
Cast Iron, newly turned 0.44
Cast Iron, turned and heated 0.60 - 0.70
Cement 0.54
Cromium polished 0.058
Clay 0.91
Coal 0.80
Concrete 0.85
Concrete, rough 0.94
Concrete tiles 0.63
Cotton cloth 0.77
Copper electroplated 0.03
Copper heated and covered with thick oxide layer 0.78
Copper Polished 0.023 - 0.052
Copper Nickel Alloy, polished 0.059
Glass smooth 0.92 - 0.94
Glass, pyrex 0.85 - 0.95
Glass, opal 0.87
Gold not polished 0.47
Gold highly polished 0.02 - 0.04
Granite, natural surface 0.96
Gravel 0.28
Gypsum 0.85
Ice smooth 0.966
Ice rough 0.985
Inconel X Oxidized 0.71
Iron polished 0.14 - 0.38
Iron, plate rusted red 0.61
Iron, dark gray surface 0.31
Iron, rough ingot 0.87 - 0.95
Lampblack paint 0.96
Lead pure unoxidized 0.057 - 0.075
Lead Oxidized 0.43
Limestone 0.90 - 0.93
Lime wash 0.91
Magnesia 0.72
Magnesite 0.38
Magnesium Oxide 0.20 - 0.55
Magnesium Polished 0.07 - 0.13
Marble White 0.95
Masonry Plastered 0.93
Mercury liquid 0.1
Mild Steel 0.20 - 0.32
Molybdenum polished 0.05 - 0.18
Mortar 0.87
Nickel, elctroplated 0.03
Nickel, polished 0.072
Nickel, oxidized 0.59 - 0.86
Nichrome wire, bright 0.65 - 0.79
Oak, planed 0.89
Oil paints, all colors 0.92 - 0.96
Paper offset 0.55
Plaster 0.98
Platinum, polished plate 0.054 - 0.104
Pine 0.84
Plaster board 0.91
Porcelain, glazed 0.92
Paint 0.96
Paper 0.93
Plaster, rough 0.91
Plastics 0.90 - 0.97
Polypropylene 0.97
Polytetrafluoroethylene (PTFE) 0.92
Polyethylene, black plastic 0.92
Porcelain glazed 0.93
Pyrex 0.92
PVC 0.91 - 0.93
Quartz glass 0.93
Roofing paper 0.91
Rubber, foam 0.90
Rubber, hard glossy plate 0.94
Rubber, natural hard 0.91
Rubber, natural oft 0.86
Salt 0.34
Sand 0.9
Sandstone 0.59
Sapphire 0.48
Sawdust 0.75
Silica 0.79
Silicon Carbide 0.83 - 0.96
Silver Polished 0.02 - 0.03
Snow 0.96 - 0.98
Soil 0.90 - 0.95
Steel Oxidized 0.79
Steel Polished 0.07
Stainless Steel, weathered 0.85
Stainless Steel, polished 0.075
Stainless Steel, type 301 0.54 - 0.63
Steel Galvanized Old 0.88
Steel Galvanized New 0.23
Thoria 0.28
Tile 0.97
Tin unoxidized 0.04
Titanium polished 0.19
Tungsten polished 0.04
Tungsten aged filament 0.032 - 0.35
Water (0 - 100oC) 0.95 - 0.963
Wood Beech, planned 0.935
Wood Oak, planned 0.885
Wood, Pine 0.95
Wrought Iron 0.94
Zinc Tarnished 0.25
Zinc polished 0.045
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