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EN 22
Operating manual – thermal imaging camera IC085LV / IC125LV
Emissivity
The emissivity is used to describe the energy radiation
characteristic of a material (see also chapter Thermography
terms).
A material's emissivity depends on various factors:
composition,
surface condition,
temperature.
The emissivity can be between 0.01 and 1 (in theory). The
following rule of thumb can be assumed:
When a material is rather dark and its surface texture matt,
it probably has a high emissivity.
The brighter and smoother the surface of a material, the
lower will be its emissivity, presumably.
The higher the emissivity of the surface to be measured,
the better it is suited for non-contact temperature
measurement by use of a pyrometer or thermal imaging
camera, since falsifying temperature reflections can be
neglected.
Entering a degree of emission as accurate as possible is
indispensable for a precise measurement.
Most organic materials have an emissivity of 0.95. Metals or
shiny materials come with a much lower value.
Material Temperature (°C) Emissivity
(approximate)
Aluminium
Polished aluminium 100 0.09
Customary aluminium
foil
100 0.09
Electrolytically
chromium-plated
aluminium oxide
25 - 600 0.55
Mild aluminium oxide 25 - 600 0.10 - 0.20
Strong aluminium oxide 25 - 600 0.30 - 0.40
FE
Polished cast iron 200 0.21
Processed cast iron 20 0.44
Polished tempered iron 40 - 250 0.28
Polished steel ingot 770 - 1040 0.52 - 0.56
Raw, welded steel 945 - 1100 0.52 - 0.61
Surface iron oxide 20 0.69
Fully rusted surface 22 0.66
Rolled iron plate 100 0.74
Oxidized steel 198 - 600 0.64 - 0.78
Cast iron
(oxidizing at 600 °C)
198 - 600 0.79
Material Temperature (°C) Emissivity
(approximate)
Steel
(oxidizing at 600 °C)
125 - 520 0.78 - 0.82
Electrolytic iron oxide 500 - 1200 0.85 - 0.95
Iron plate 925 - 1120 0.87 - 0.95
Cast iron, heavy iron
oxide
25 0.80
Tempered iron, iron
oxide
40 - 250 0.95
Melting surface 22 0.94
Molten cast iron 1300 - 1400 0.29
Molten structural steel 1600 - 1800 0.28
Liquid steel 1500 - 1650 0.28
Pure iron ore 1515 - 1680 0.42 - 0.45
Galvanized, shiny iron
plate
28 0.23
Copper
Copper oxide 800 - 1100 0.13 - 0.16
Copper mirror 100 0.05
Strong copper oxide 25 0.078
Liquid copper 1080 - 1280 0.13 - 0.16
Brass
Brass mirror 28 0.03
Brass oxide 200 - 600 0.59 - 0.61
Chromium
Polished chrome 40 - 1090 0.08 - 0.36
Gold
Gold mirror 230 - 630 0.02
Silver
Polished silver 100 0.05
Nickel
Nickel chromium (heat-
resistant)
50 - 1000 0.65 - 0.79
Nickel chromium alloy 50 - 1040 0.64 - 0.76
Nickel chromium alloyed
(heat-resistant)
50 - 500 0.95 - 0.98
Nickel silver alloy 100 0.14
Polished, galvanized 25 0.05
Galvanized 20 0.01
Nickel wire 185 - 1010 0.09 - 0.19
Lead
Pure lead (not oxidized) 125 - 225 0.06 - 0.08
23


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