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Appendix: Emissivity Chart
Emissivity is a term used to describe the energy-emitting characteristics
of materials. Most (90% of typical applications) organic materials and
painted or oxidized surfaces have an emissivity of 0.95.
Inaccurate readings will result from measuring shiny or polished metal
surfaces. To compensate, cover the surface to be measured with masking
tape or flat black paint. Allow time for the tape to reach the same
temperature as the material underneath it. Measure the temperature of the
tape or painted surface.
Measured Surfaces
Emissivity
Metal
Aluminum: Oxidization
0.2-0.4
A3003 Alloy: Oxidization, Rough
0.3, 0.1-0.3
Brass: Burnishing, Oxidization
0.3, 0.5
Copper: Oxidization,
Electric Terminal Board
0.4-0.8, 0.6
Hastelloy: Alloy
0.3-0.8
Inconel: Oxidization,
Sand-Blasting, Electro Burnishing
0.7-0.95, 0.3-0.6, 0.15
Iron: Oxidization, Rusting
0.5-0.9, 0.5-0.7
Iron (Casting): Oxidization,
Non-Oxidization, Casting
0.6-0.95, 0.2, 0.2-0.3
Iron (Forging): Passivation
0.9
Lead: Rough, Oxidization
0.4, 0.2-0.6
Molybdenum: Oxidization
0.2-0.6
Nickel: Oxidization
0.2-0.5
Platinum: Black
0.9
continued...
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