Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Radiation Constants Building Materials

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

Sponsored Links

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 oC4)(10-8  Btu/(h ft2 oF4))
Black body 5.7 0.173
Brass, dull 0.152 0.036
Brick 5.16 0.156
Cast iron, rough oxidized 5.09 0.154
Copper, polished 0.119 0.028
Cotton 4.23 0.128
Glass 5.13 0.155
Lamp black 5.16 0.156
Oil paint 4.30 0.130
Paper 4.43 0.134
Plaster 5.16 0.156
Sand 4.20 0.127
Shavings 4.10 0.124
Silk 4.30 0.130
Silver 1.19 0.0046
Tin 0.26 0.0077
Water 3.70 0.112
Wood 4.17 0.126
Wool 4.30 0.130
Wrought iron, dull oxidized 5.16 0.156
Wrought iron, polished 1.55 0.047
Zinc, dull 0.152 0.036

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)

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

About the Engineering ToolBox!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.


This page can be cited as

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

Modify access date.

. .


3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

12 3

Sponsored Links