PeakTech 5040 Bedienungsanleitung Seite 26

Emissivity
Most (90 % of typical applications) organic materials and painted or
oxidised 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, 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.
Emissivity Values
Substance Thermal
emissivity
Asphalt 0,90 to 0,98
Concrete 0,94
Cement 0,96
Sand 0,90
Earth 0,92 to 0,96
Water 0,92 to 0,96
Ice 0,96 to 0,98
Snow 0,83
Glass 0,90 to 0,95
Ceramic 0,90 to 0,94
Marble 0,94
Plaster 0,80 to 0,90
Mortar 0,89 to 0,91
Brick 0,93 to 0,96
Substance Thermal
emissivity
Cloth (black) 0,98
Human skin 0,98
Lather 0,75 to 0,80
Charcoal (powder) 0,96
Lacquer 0,80 to 0,95
Lacquer (matt) 0,97
Rubber (black) 0,94
Plastic 0,85 to 0,95
Timber 0,90
Paper 0,70 to 0,94
Chromium oxides 0,81
Copper oxides 0,78
Iron oxides 0,78 to 0,82
Textiles 0,90
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