Low Temperature Thermometer
RT8B
User Guide
14
7.2 Alloys
Alloys
Material
Emissivity Value
Brass
Oxidised
0.30
0.60
Chromel & Alumel
Oxidised
0.30
0.80
Constantin & Manganin
Oxidised
0.05
0.35
Inconel
Oxidised
0.10
0.85
Monel
Oxidised
0.10
0.70
Nichrome
Oxidised
0.20
0.85
Fig. 11 - Typical Emissivity Values for Alloys
7.3 Miscellaneous
Miscellaneous
Material
Emissivity Value
Asphalt
0.95
Asbestos (board/paper/cloth)
0.90
Brick
Graphite
soot
0.85
0.80
0.95
Cement & Concrete
0.90
Cloth (all types - close weave)
[Open weave reduces emissivity]
0.85
Paper & Cardboard
0.80 to 0.95
Plastics opaque
transmission 0.1
transmission 0.4
0.85
0.75
0.45
Paints oils & enamels
lacquers
aluminium
0.90
0.85
0.30 to 0.60
Water depth > 50mm
0.95
Wood
0.85
Fig. 12 Typical Emissivity Values for Miscellaneous Materials
