BESANTEK
Emissivity
Most organic materials and painted or oxidized surfaces have an
emissivity of 0.95. Inaccurate readings will result when measuring
shiny or polished surfaces. To compensate, cover the surface
under test with masking tape or flat black paint. Allow time for the
tape to reach the same temperature as the material underneath
then measure the temperature of the tape or the painted surface.
Thermal emissivity Table for Common Materials
Material
Emissivity
Asphalt
0.90 to 0.98
Concrete
0
.
94
Cement
0.96
Sand
0.90
Earth
0.92 to 0.96
Water
0
.
67
Ice
0.96 to 0.98
Snow
0
.
83
Glass
0.85 to 1.00
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