HT instruments HT3310 - Manual (Page 10)

HT3301-HT3310
EN - 9
Emissivity of common metal, refractory and buildings materials is shown in Table 2
Object Emissivity Object Emissivity
Zinc (oxidized) 0.1 (*) Carbon (soot) 0.95
Galvanized iron 0.3 Red brick (rough) 0.75 to 0.9
Tin-plated steel 0.1 (*) Fire clay 0.75
Gold (polished) 0.1 (*) Asbestos 0.95
Silver (polished) 0.1 (*) Cast iron (turned 100°C) 0.45
Chromium (polished) 0.1 (*) Cast iron (turned 100°C) 0.6 to 0.7
Steel (ground sheet) 0.6 Zirconium 0.85
Steel plate (oxidized) 0.9 Cast iron (rough) 0.95
Rough ingot iron 0.9 Polished aluminium 0.1 (*)
Aluminium (oxidized) 0.25 Aluminium oxide at 260°C 0.6
Aluminium oxide at 800°C 0.3 Brass (polished) 0.1 (*)
Brass (roughened) 0.2 Brass (oxidized) 0.6
Copper (polished) 0.05 (*) Copper (oxidized) 0.8
Molten copper 0.15 Lead (pure) 0.1 (*)
Lead (oxidized at 25°C) 0.3 Lead (oxidized at 200°C) 0.6
Nickel (pure) 0.1 (*) Nick-Chrome 0.7
Nick-Chrome (oxidized) 0.95 Mortar 0.89 to 0.91
Marble 0.9 Plaster 0.9
Alumina (fine grain) 0.25 Alumina (coarse grain) 0.45
Silica (fine grain) 0.4 Silica (coarse grain) 0.55
Quartz (rough) 0.9 Carbon (graphite) 0.75
Timber (various) 0.8 to 0.9 Enamel (any colour) 0.9
Oil paint (any colour) 0.95 Lacquer 0.9
Water 0.98 Rubber (smooth) 0.9
Rubber (rough) 0.98 Plastic (various) 0.8 to 0.95
Paper 0.9 Silicone polish 0.7
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Lather 0.75 to 0.80
Sand 0.90 Charcoal (powder) 0.96
Earth 0.92 to 0.96 Glass 0.90 to 0.95
Water 0.92 to 0.96 Ceramic 0.90 to 0.94
Ice 0.96 to 0.98 Rubber (black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
(*) Emissivity variable with point
Table 2: Emissivity values