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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
Metal
Aluminum: Oxidization
A3003 Alloy: Oxidization, Rough
Brass: Burnishing, Oxidization
Copper: Oxidization,
Electric Terminal Board
Hastelloy: Alloy
Inconel: Oxidization,
Sand-Blasting, Electro Burnishing
Iron: Oxidization, Rusting
Iron (Casting): Oxidization,
Non-Oxidization, Casting
Iron (Forging): Passivation
Lead: Rough, Oxidization
Molybdenum: Oxidization
Nickel: Oxidization
Platinum: Black
Emissivity
0.2-0.4
0.3, 0.1-0.3
0.3, 0.5
0.4-0.8, 0.6
0.3-0.8
0.7-0.95, 0.3-0.6, 0.15
0.5-0.9, 0.5-0.7
0.6-0.95, 0.2, 0.2-0.3
0.9
0.4, 0.2-0.6
0.2-0.6
0.2-0.5
0.9
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