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Building Materials - Radiation Constants

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.

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The radiation constant is the product between the Stefan-Boltzmann constant - σ - and the emissivity constant - ε - of a material.

The radiation constant for some typical products:

ProductRadiation Constant
(10-8  W/m2 K4)
Emissivity Constant
- ε -
Black body 5.7 1
Brass, dull 1.3 0.22
Brick, red 5.3 0.93
Cast iron, rough oxidized 5.1 0.9
Copper, polished 0.28 0.04
Cotton 4.4 0.77
Glass 5.1 0.9
Lampblack paint 5.5 0.96
Oil paint 5.4 0.94
Paper 3.1 0.55
Plaster 5.6 0.98
Sand 5.1 0.9
Silk 4.3 0.75
Silver, polished 0.17 0.03
Tin, unoxidized 0.23 0.04
Water, 0 - 100oC 5.4 0.95
Wood 5.1 0.9
Wool 4.3 0.75
Wrought iron, dull oxidized 5.4 0.9
Wrought iron, polished 1.6 0.25
Zinc, tarnished 1.4 0.25

σ = 5.6703 10-8 (W/m2K4) = 0.1714 10-8 (Btu/(h ft2 oR4) ) - Stefan-Boltzmann Constant

ε = emissivity coefficient of the object (ε = 1 for a black body)

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  • Engineering ToolBox, (2003). Building Materials - Radiation Constants. [online] Available at: [Accessed Day Mo. Year].

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