Table 23 Emissivities of Various Materials (Table C3.7 CIBSE Guide)
Material
Surface
Emissivity
Aluminium
polished
0.04
unoxidised
0.03
oxidised
0.1
anodised
0.72
Brick
0.93
Chromium
polished
0.06
unoxidised
0.08
Clay
0.91
Copper
polished
0.02
oxidised
0.6
Enamel
0.9
Glass
0.88
Lead
grey oxidised
0.28
grey unoxidised
0.05
red
0.93
Mortar
0.93
Paint
0.95
Paper
0.92
Steel
polished
0.08
oxidised
0.79
rolled sheet
0.6
rough plate
0.9
Wood
beech
0.94
Zinc
galvanising
0.23
Note emissivities quoted are normal to the surface. The hemispherical values may be obtained from the tabulated values by multiplying by the following factors:
