HT instruments HT3320 - Manual (Page 15)

HT3320
EN - 14
Material Emissivity Material Emissivity
Zinc (oxidized) 0.1 (*) Carbon 0.95
Iron (polarized) 0.3 Red brick (rough) 0.75 - 0.9
Tin-plated steel 0.1 (*) Fire clay 0.75
Gold (polished) 0.1 (*) Asbestos 0.95
Silver (polished) 0.1 (*) Cast iron (at 100°C) 0.45
Chromium (polished) 0.1 (*) Cast iron (at 1000°C) 0.6 – 0.7
Steel (ground sheet) 0.6 Zirconium 0.85
Steel (oxidized) 0.9 Wrought iron 0.95
Liquid iron 0.9 Aluminium (polished) 0.1 (*)
Oxidized aluminium 0.25 Oxidized aluminium at 260°C 0.6
Oxidized aluminium at
800°C
0.3 Brass (polished) 0.1 (*)
Brass (rough) 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 (*) Nickel-Chromium 0.7
Nick-Chromium (oxidized) 0.95 Mortar 0.89 .. 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 Graphite 0.75
Timber 0.8 - 0.9 Enamel (any color) 0.9
Paint (any color) 0.95 Lacquer 0.9
Water 0.98 Rubber (smooth) 0.9
Rubber (rough) 0.98 Plastic (various) 0.8 - 0.95
Paper 0.9 Silicone 0.7
Asphalt 0.90 .. 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Leather 0.75 .. 0.80
Sand 0.90 Charcoal powder 0.96
Earth 0.92 .. 0.96 Glass 0.90 .. 0.95
Water 0.92 .. 0.96 Ceramic 0.90 .. 0.94
Ice 0.96 .. 0.98 Rubber 0.94
Snow 0.83 Plastic 0.85 .. 0.95
(*) Emissivity variable with point
Table 3: Emissivity values of materials