13
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 (pre-set in the unit).
Inaccurate readings will result from measuring shiny or polished
metal surfaces.
To compensate, cove 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.
Emissivity Values
Substance
Thermal
emissivity
Substance
Thermal
emissivity
Asphalt
0,90 to 0,98
Cloth (black)
0,98
Concrete
0,94
Human skin
0,98
Cement
0,96
Leather
0,75 to 0,80
Sand
0,90
Charcoal (po-
wder)
0,96
Earth
0,92 to 0,96
Lacquer
0,80 to 0,95
Water
0,92 to 0,96
Lacquer (matt)
0,97
Ice
0,96 to 0,98
Rubber (black)
0,94
Snow
0,83
Plastic
0,85 to 0,95
Glass
0,90 to 0,95
Timber
0,90
Ceramic
0,90 to 0,94
Paper
0,70 to 0,94
Marble
0,94
Chromium oxides
0,81
Plaster
0,80 to 0,90
Copper oxides
0,78
Mortar
0,89 to 0,91
Iron oxides
0,78 to 0,82
Brick
0,93 to 0,96
Textiles
0,90
