Fluke Endurance E3ML - Determination of Slope; Table 14: Typical Emissivity Values (Non-Metals)

Endurance® Series
Users Manual
94
Emissivity at 1 µm for Metals
Emissivity at 1 µm for Metals
Material
Emissivity
Material
Emissivity
Aluminum
Iron, cast
unoxidized
0.1-0.2
oxidized
0.7-0.9
oxidized
0.4
unoxidized
0.35
roughened
0.2-0.8
molten
0.35
polished
0.1-0.2
Magnesium
0.3-0.8
Brass
Molybdenum
polished
0.1-0.3
oxidized
0.5-0.9
Burnished
0.6
Monel (Ni-Cu)
0.25-0.35
Chromium
0.4
Nickel
Copper
unoxidized
0.3
polished
0.05
oxidized
0.8-0.9
roughened
0.05-0.2
electrolytic
0.2-0.4
oxidized
0.2-0.8
Silver
0.04
Gold
0.3
Steel
Haynes
cold rolled
0.8-0.9
Alloy
0.5-0.9
polished sheet
0.35
Inconel
molten
0.35
oxidized
0.4-0.9
oxidized
0.8-0.9
sandblasted
0.3-0.4
stainless
0.35
electropolished
0.2-0.5
Tin (unoxidized)
0.25
Iron
Titanium
oxidized
0.4-0.8
polished
0.5-0.75
unoxidized
0.35
Zinc
molten
0.35
oxidized
0.6
polished
0.5
Table 14: Typical Emissivity Values (Non-Metals)
Emissivity at 1 µm for Non-Metals
Material
Emissivity
Asbestos
0.9
Ceramic
0.4
Concrete
0.65
Carbon
unoxidized
0.8-0.95
graphite
0.8-0.9
12.3. Determination of Slope
The following slope settings (applicable for 2-color operations) are approximate and will vary
depending on the metal alloy and surface finish, as well as the application. These are supplied
here as examples.
Set the slope to approximately 1.000 for measuring the following metals with oxidized surfaces:
• Stainless Steel • Cobalt • Steel
• Iron • Nickel
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