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Home > Technology > Emissivity >
 
Emissivity Table for Metals

In the table below, please use the 8-14 micron column if you have an MT, ST, or MX.
Please check your user manual if you own a 3i to determine the correct
column to use.

Note: These emissivities values are "approximate" and may vary depending on the
actual material and conditions.

Material Emissivity
1.0µm 1.6µm 8-14µm
Aluminum
   Unoxidized 0.1-0.2 0.02-0.2 n.r.
   Oxidized 0.4 0.4 0.2-0.4
   Alloy A3003
     Oxidized n.r. 0.4 0.3
   Roughened 0.2-0.8 0.2-0.6 0.1-0.3
   Polished 0.1-0.2 0.02-0.1 n.r.
Brass
   Polished 0.8-0.95 0.01-0.05 n.r.
     Burnished n.r. n.r. 0.3
     Oxidized 0.6 0.6 0.5
Chromium 0.4 0.4 n.r.
Copper
   Polished n.r. 0.03 n.r.
   Roughened n.r. 0.05-0.2 n.r.
   Oxidized 0.2-0.8 0.2-0.9 0.4-0.8
   Electrical Terminal Blocks n.r. n.r. 0.6
Gold 0.3 0.01-0.1 n.r.
Haynes
   Alloy 0.5-0.9 0.6-0.9 0.3-0.8
Inconel
   Oxidized 0.4-0.9 0.6-0.9 0.7-.95
   Sandblasted 0.3-0.4 0.3-0.6 0.3-0.6
   Electoropolished 0.2-0.5 0.25 0.15
Iron
   Oxidized 0.4-0.8 0.5-0.9 0.5-0.9
   Unoxidized 0.35 0.1-0.3 n.r.
   Rusted n.r. 0.6-0.9 0.5-0.7
   Molten 0.35 0.4-0.6 n.r.
Iron, Cast
   Oxidized 0.7-0.9 0.7-0.9 0.6-0.95
   Unoxidized 0.35 0.3 0.2
   Molten .035 0.3-0.4 0.2-0.3
Iron, Wrought
   Dull 0.9 0.9 0.9
Lead
Polished 0.35 0.05-0.2 n.r.
   Rough 0.65 0.6 0.4
   Oxidized n.r. 0.3-0.7 0.2-0.6
Magnesium 0.3-0.8 0.05-0.3 n.r.
Mercury n.r. 0.05-0.15 n.r.
Molybdenum
   Oxidized 0.5-0.9 0.4-0.9 0.2-0.6
   Unoxidized 0.25-0.35 0.1-0.35
Nickel
   Oxidized 0.8-0.9 0.4-0.7 0.2-0.5
   Electrolytic 0.2-0.04 0.1-0.3 n.r.
Platinum
   Black n.r. 0.95 0.9
Silver n.r. 0.02 .n.r
Steel
   Cold-Rolled 0.8-0.9 0.8-0.9 0.7-0.9
   ground Sheet n.r. n.r. 0.4-0.6
   Polished Sheet 0.35 0.25 0.1
   Molten 0.35 0.25-0.4 n.r.
   Oxidized 0.8-0.9 0.8-0.9 0.7-0.9
   Stainless 0.35 0.2-0.9 0.1-0.8
Tin(Unoxidized) 0.25 0.1-0.3 n.r.
Titanium
   Polished 0.5-0.75 0.3-0.5 n.r.
   Oxidized n.r. 0.6-0.8 0.5-0.6
Tungsten n.r. 0.1-0.6 n.r.
   Polished 0.35-0.4 0.1-0.3 n.r.
Zinc
   Oxidized 0.6 0.15 0.1
   Polished 0.5 0.05 n.r.

n.r.=not Unsere Empfehlungen

To optimize surface temperature measurement accuracy:
1. Determine the object emissivity for the spectral range of the instrument to
be used for the measurement.
2. Avoid reflections by shielding object from surrounding high temperature sources.
3. For higher temperature objects use shorter wavelength instruments, whenever possible.
4. For semi-transparent materials such as plastic film and glass, assure that
the background is uniform and lower in temperature than the object.
5. Hold instrument perpendicular to surface whenever emissivity is less than 0.9.
In all cases, do not exceed angles more than 30 degrees from incidence.
6. For 1M and 2M models, avoid measurements in high ambient light conditions.

Related Items: Emissivity Table for Non-Metals