LIMIT 98, Operating Manual

Page: 13 / 156

9
20. Emissivity
Emissivity characterization reflects the of material’s radiated energy. Emissivity for most organic materials,
paints or oxidized surfaces are about 0.95. Total emissivity of selected metals and non-metals are listed in the
following table.
Measured surfaces Emissivity
Metal
Aluminum Oxidization 0.2-0.4
A3003 Alloy
Oxidization 0.3
Rough 0.1-0.3
Brass
Burnishing 0.3
Oxidization 0.5
Copper
Oxidization 0.4-0.8
Electric terminal board 0.6
Hastelloy Alloy 0.3-0.8
Inconel
Oxidization 0.7-0.95
Sand-blasting 0.3-0.6
Electro burnishing 0.15
Iron
Oxidization 0.5-0.9
Rusting 0.5-0.7
Iron (casting)
Oxidization 0.6-0.95
Non-oxidization 0.2
Casting 0.2-0.3
Iron (forging) Passivation 0.9
Lead
Rough 0.4
Oxidization 0.2-0.6
Molybdenum Oxidization 0.2-0.6
Nickel Oxidization 0.2-0.5
Platinum Black 0.9
Steel
Cold rolling 0.7-0.9
Steel plate burnishing 0.4-0.6
Steel plate rubbing 0.1
Zinc Oxidization 0.1
Measured surfaces Emissivity
Non-metal
Asbestos 0.95
Asphalt 0.95
Basalt 0.7
Carbon
Non-oxidization 0.8-0.9
Graphite 0.7-0.8
Silicon carbide 0.9
Ceramics 0.95
Clay 0.95
Concrete 0.95
Cloth 0.9
Glass
Convex glass 0.76-0.8
Smooth glass 0.92-0.94
Lead-boron glass 0.78-0.82
Plates 0.96
Stone products 0.93
Plaster 0.8-0.95
Ice 0.98
Limestone 0.98
Paper 0.95
Plastics 0.95
Water 0.93
Soil 0.9-0.98
Wood 0.9-0.95
English
GB